Wordpress/wp-includes/theme.php

1885 lines
53 KiB
PHP

<?php
/**
* Theme, template, and stylesheet functions.
*
* @package WordPress
* @subpackage Template
*/
/**
* Whether a child theme is in use.
*
* @since 3.0.0
*
* @return bool true if a child theme is in use, false otherwise.
**/
function is_child_theme() {
return ( TEMPLATEPATH !== STYLESHEETPATH );
}
/**
* Retrieve name of the current stylesheet.
*
* The theme name that the administrator has currently set the front end theme
* as.
*
* For all extensive purposes, the template name and the stylesheet name are
* going to be the same for most cases.
*
* @since 1.5.0
* @uses apply_filters() Calls 'stylesheet' filter on stylesheet name.
*
* @return string Stylesheet name.
*/
function get_stylesheet() {
return apply_filters('stylesheet', get_option('stylesheet'));
}
/**
* Retrieve stylesheet directory path for current theme.
*
* @since 1.5.0
* @uses apply_filters() Calls 'stylesheet_directory' filter on stylesheet directory and theme name.
*
* @return string Path to current theme directory.
*/
function get_stylesheet_directory() {
$stylesheet = get_stylesheet();
$theme_root = get_theme_root( $stylesheet );
$stylesheet_dir = "$theme_root/$stylesheet";
return apply_filters( 'stylesheet_directory', $stylesheet_dir, $stylesheet, $theme_root );
}
/**
* Retrieve stylesheet directory URI.
*
* @since 1.5.0
*
* @return string
*/
function get_stylesheet_directory_uri() {
$stylesheet = get_stylesheet();
$theme_root_uri = get_theme_root_uri( $stylesheet );
$stylesheet_dir_uri = "$theme_root_uri/$stylesheet";
return apply_filters( 'stylesheet_directory_uri', $stylesheet_dir_uri, $stylesheet, $theme_root_uri );
}
/**
* Retrieve URI of current theme stylesheet.
*
* The stylesheet file name is 'style.css' which is appended to {@link
* get_stylesheet_directory_uri() stylesheet directory URI} path.
*
* @since 1.5.0
* @uses apply_filters() Calls 'stylesheet_uri' filter on stylesheet URI path and stylesheet directory URI.
*
* @return string
*/
function get_stylesheet_uri() {
$stylesheet_dir_uri = get_stylesheet_directory_uri();
$stylesheet_uri = $stylesheet_dir_uri . "/style.css";
return apply_filters('stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri);
}
/**
* Retrieve localized stylesheet URI.
*
* The stylesheet directory for the localized stylesheet files are located, by
* default, in the base theme directory. The name of the locale file will be the
* locale followed by '.css'. If that does not exist, then the text direction
* stylesheet will be checked for existence, for example 'ltr.css'.
*
* The theme may change the location of the stylesheet directory by either using
* the 'stylesheet_directory_uri' filter or the 'locale_stylesheet_uri' filter.
* If you want to change the location of the stylesheet files for the entire
* WordPress workflow, then change the former. If you just have the locale in a
* separate folder, then change the latter.
*
* @since 2.1.0
* @uses apply_filters() Calls 'locale_stylesheet_uri' filter on stylesheet URI path and stylesheet directory URI.
*
* @return string
*/
function get_locale_stylesheet_uri() {
global $wp_locale;
$stylesheet_dir_uri = get_stylesheet_directory_uri();
$dir = get_stylesheet_directory();
$locale = get_locale();
if ( file_exists("$dir/$locale.css") )
$stylesheet_uri = "$stylesheet_dir_uri/$locale.css";
elseif ( !empty($wp_locale->text_direction) && file_exists("$dir/{$wp_locale->text_direction}.css") )
$stylesheet_uri = "$stylesheet_dir_uri/{$wp_locale->text_direction}.css";
else
$stylesheet_uri = '';
return apply_filters('locale_stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri);
}
/**
* Retrieve name of the current theme.
*
* @since 1.5.0
* @uses apply_filters() Calls 'template' filter on template option.
*
* @return string Template name.
*/
function get_template() {
return apply_filters('template', get_option('template'));
}
/**
* Retrieve current theme directory.
*
* @since 1.5.0
* @uses apply_filters() Calls 'template_directory' filter on template directory path and template name.
*
* @return string Template directory path.
*/
function get_template_directory() {
$template = get_template();
$theme_root = get_theme_root( $template );
$template_dir = "$theme_root/$template";
return apply_filters( 'template_directory', $template_dir, $template, $theme_root );
}
/**
* Retrieve theme directory URI.
*
* @since 1.5.0
* @uses apply_filters() Calls 'template_directory_uri' filter on template directory URI path and template name.
*
* @return string Template directory URI.
*/
function get_template_directory_uri() {
$template = get_template();
$theme_root_uri = get_theme_root_uri( $template );
$template_dir_uri = "$theme_root_uri/$template";
return apply_filters( 'template_directory_uri', $template_dir_uri, $template, $theme_root_uri );
}
/**
* Retrieve theme data from parsed theme file.
*
* The description will have the tags filtered with the following HTML elements
* whitelisted. The <b>'a'</b> element with the <em>href</em> and <em>title</em>
* attributes. The <b>abbr</b> element with the <em>title</em> attribute. The
* <b>acronym</b> element with the <em>title</em> attribute allowed. The
* <b>code</b>, <b>em</b>, and <b>strong</b> elements also allowed.
*
* The style.css file must contain theme name, theme URI, and description. The
* data can also contain author URI, author, template (parent template),
* version, status, and finally tags. Some of these are not used by WordPress
* administration panels, but are used by theme directory web sites which list
* the theme.
*
* @since 1.5.0
*
* @param string $theme_file Theme file path.
* @return array Theme data.
*/
function get_theme_data( $theme_file ) {
$default_headers = array(
'Name' => 'Theme Name',
'URI' => 'Theme URI',
'Description' => 'Description',
'Author' => 'Author',
'AuthorURI' => 'Author URI',
'Version' => 'Version',
'Template' => 'Template',
'Status' => 'Status',
'Tags' => 'Tags'
);
$themes_allowed_tags = array(
'a' => array(
'href' => array(),'title' => array()
),
'abbr' => array(
'title' => array()
),
'acronym' => array(
'title' => array()
),
'code' => array(),
'em' => array(),
'strong' => array()
);
$theme_data = get_file_data( $theme_file, $default_headers, 'theme' );
$theme_data['Name'] = $theme_data['Title'] = wp_kses( $theme_data['Name'], $themes_allowed_tags );
$theme_data['URI'] = esc_url( $theme_data['URI'] );
$theme_data['Description'] = wptexturize( wp_kses( $theme_data['Description'], $themes_allowed_tags ) );
$theme_data['AuthorURI'] = esc_url( $theme_data['AuthorURI'] );
$theme_data['Template'] = wp_kses( $theme_data['Template'], $themes_allowed_tags );
$theme_data['Version'] = wp_kses( $theme_data['Version'], $themes_allowed_tags );
if ( $theme_data['Status'] == '' )
$theme_data['Status'] = 'publish';
else
$theme_data['Status'] = wp_kses( $theme_data['Status'], $themes_allowed_tags );
if ( $theme_data['Tags'] == '' )
$theme_data['Tags'] = array();
else
$theme_data['Tags'] = array_map( 'trim', explode( ',', wp_kses( $theme_data['Tags'], array() ) ) );
if ( $theme_data['Author'] == '' ) {
$theme_data['Author'] = $theme_data['AuthorName'] = __('Anonymous');
} else {
$theme_data['AuthorName'] = wp_kses( $theme_data['Author'], $themes_allowed_tags );
if ( empty( $theme_data['AuthorURI'] ) ) {
$theme_data['Author'] = $theme_data['AuthorName'];
} else {
$theme_data['Author'] = sprintf( '<a href="%1$s" title="%2$s">%3$s</a>', $theme_data['AuthorURI'], esc_attr__( 'Visit author homepage' ), $theme_data['AuthorName'] );
}
}
return $theme_data;
}
/**
* Retrieve list of themes with theme data in theme directory.
*
* The theme is broken, if it doesn't have a parent theme and is missing either
* style.css and, or index.php. If the theme has a parent theme then it is
* broken, if it is missing style.css; index.php is optional. The broken theme
* list is saved in the {@link $wp_broken_themes} global, which is displayed on
* the theme list in the administration panels.
*
* @since 1.5.0
* @global array $wp_broken_themes Stores the broken themes.
* @global array $wp_themes Stores the working themes.
*
* @return array Theme list with theme data.
*/
function get_themes() {
global $wp_themes, $wp_broken_themes;
if ( isset($wp_themes) )
return $wp_themes;
if ( !$theme_files = search_theme_directories() )
return false;
asort( $theme_files );
$wp_themes = array();
foreach ( (array) $theme_files as $theme_file ) {
$theme_root = $theme_file['theme_root'];
$theme_file = $theme_file['theme_file'];
if ( !is_readable("$theme_root/$theme_file") ) {
$wp_broken_themes[$theme_file] = array('Name' => $theme_file, 'Title' => $theme_file, 'Description' => __('File not readable.'));
continue;
}
$theme_data = get_theme_data("$theme_root/$theme_file");
$name = $theme_data['Name'];
$title = $theme_data['Title'];
$description = wptexturize($theme_data['Description']);
$version = $theme_data['Version'];
$author = $theme_data['Author'];
$template = $theme_data['Template'];
$stylesheet = dirname($theme_file);
$screenshot = false;
foreach ( array('png', 'gif', 'jpg', 'jpeg') as $ext ) {
if (file_exists("$theme_root/$stylesheet/screenshot.$ext")) {
$screenshot = "screenshot.$ext";
break;
}
}
if ( empty($name) ) {
$name = dirname($theme_file);
$title = $name;
}
$parent_template = $template;
if ( empty($template) ) {
if ( file_exists("$theme_root/$stylesheet/index.php") )
$template = $stylesheet;
else
continue;
}
$template = trim( $template );
if ( !file_exists("$theme_root/$template/index.php") ) {
$parent_dir = dirname(dirname($theme_file));
if ( file_exists("$theme_root/$parent_dir/$template/index.php") ) {
$template = "$parent_dir/$template";
$template_directory = "$theme_root/$template";
} else {
/**
* The parent theme doesn't exist in the current theme's folder or sub folder
* so lets use the theme root for the parent template.
*/
if ( isset($theme_files[$template]) && file_exists( $theme_files[$template]['theme_root'] . "/$template/index.php" ) ) {
$template_directory = $theme_files[$template]['theme_root'] . "/$template";
} else {
if ( empty( $parent_template) )
$wp_broken_themes[$name] = array('Name' => $name, 'Title' => $title, 'Description' => __('Template is missing.'), 'error' => 'no_template');
else
$wp_broken_themes[$name] = array('Name' => $name, 'Title' => $title, 'Description' => sprintf( __('The parent theme is missing. Please install the "%s" parent theme.'), $parent_template ), 'error' => 'no_parent', 'parent' => $parent_template );
continue;
}
}
} else {
$template_directory = trim( $theme_root . '/' . $template );
}
$stylesheet_files = array();
$template_files = array();
$stylesheet_dir = @ dir("$theme_root/$stylesheet");
if ( $stylesheet_dir ) {
while ( ($file = $stylesheet_dir->read()) !== false ) {
if ( !preg_match('|^\.+$|', $file) ) {
if ( preg_match('|\.css$|', $file) )
$stylesheet_files[] = "$theme_root/$stylesheet/$file";
elseif ( preg_match('|\.php$|', $file) )
$template_files[] = "$theme_root/$stylesheet/$file";
}
}
@ $stylesheet_dir->close();
}
$template_dir = @ dir("$template_directory");
if ( $template_dir ) {
while ( ($file = $template_dir->read()) !== false ) {
if ( preg_match('|^\.+$|', $file) )
continue;
if ( preg_match('|\.php$|', $file) ) {
$template_files[] = "$template_directory/$file";
} elseif ( is_dir("$template_directory/$file") ) {
$template_subdir = @ dir("$template_directory/$file");
if ( !$template_subdir )
continue;
while ( ($subfile = $template_subdir->read()) !== false ) {
if ( preg_match('|^\.+$|', $subfile) )
continue;
if ( preg_match('|\.php$|', $subfile) )
$template_files[] = "$template_directory/$file/$subfile";
}
@ $template_subdir->close();
}
}
@ $template_dir->close();
}
//Make unique and remove duplicates when stylesheet and template are the same i.e. most themes
$template_files = array_unique($template_files);
$stylesheet_files = array_unique($stylesheet_files);
$template_dir = $template_directory;
$stylesheet_dir = $theme_root . '/' . $stylesheet;
if ( empty($template_dir) )
$template_dir = '/';
if ( empty($stylesheet_dir) )
$stylesheet_dir = '/';
// Check for theme name collision. This occurs if a theme is copied to
// a new theme directory and the theme header is not updated. Whichever
// theme is first keeps the name. Subsequent themes get a suffix applied.
// The Twenty Ten, Default and Classic themes always trump their pretenders.
if ( isset($wp_themes[$name]) ) {
$trump_cards = array(
'classic' => 'WordPress Classic',
'default' => 'WordPress Default',
'twentyten' => 'Twenty Ten',
);
if ( isset( $trump_cards[ $stylesheet ] ) && $name == $trump_cards[ $stylesheet ] ) {
// If another theme has claimed to be one of our default themes, move
// them aside.
$suffix = $wp_themes[$name]['Stylesheet'];
$new_name = "$name/$suffix";
$wp_themes[$new_name] = $wp_themes[$name];
$wp_themes[$new_name]['Name'] = $new_name;
} else {
$name = "$name/$stylesheet";
}
}
$theme_roots[$stylesheet] = str_replace( WP_CONTENT_DIR, '', $theme_root );
$wp_themes[$name] = array(
'Name' => $name,
'Title' => $title,
'Description' => $description,
'Author' => $author,
'Author Name' => $theme_data['AuthorName'],
'Author URI' => $theme_data['AuthorURI'],
'Version' => $version,
'Template' => $template,
'Stylesheet' => $stylesheet,
'Template Files' => $template_files,
'Stylesheet Files' => $stylesheet_files,
'Template Dir' => $template_dir,
'Stylesheet Dir' => $stylesheet_dir,
'Status' => $theme_data['Status'],
'Screenshot' => $screenshot,
'Tags' => $theme_data['Tags'],
'Theme Root' => $theme_root,
'Theme Root URI' => str_replace( WP_CONTENT_DIR, content_url(), $theme_root ),
);
}
unset($theme_files);
/* Store theme roots in the DB */
if ( get_site_transient( 'theme_roots' ) != $theme_roots )
set_site_transient( 'theme_roots', $theme_roots, 7200 ); // cache for two hours
unset($theme_roots);
/* Resolve theme dependencies. */
$theme_names = array_keys( $wp_themes );
foreach ( (array) $theme_names as $theme_name ) {
$wp_themes[$theme_name]['Parent Theme'] = '';
if ( $wp_themes[$theme_name]['Stylesheet'] != $wp_themes[$theme_name]['Template'] ) {
foreach ( (array) $theme_names as $parent_theme_name ) {
if ( ($wp_themes[$parent_theme_name]['Stylesheet'] == $wp_themes[$parent_theme_name]['Template']) && ($wp_themes[$parent_theme_name]['Template'] == $wp_themes[$theme_name]['Template']) ) {
$wp_themes[$theme_name]['Parent Theme'] = $wp_themes[$parent_theme_name]['Name'];
break;
}
}
}
}
return $wp_themes;
}
/**
* Retrieve theme roots.
*
* @since 2.9.0
*
* @return array|string An arry of theme roots keyed by template/stylesheet or a single theme root if all themes have the same root.
*/
function get_theme_roots() {
global $wp_theme_directories;
if ( count($wp_theme_directories) <= 1 )
return '/themes';
$theme_roots = get_site_transient( 'theme_roots' );
if ( false === $theme_roots ) {
get_themes();
$theme_roots = get_site_transient( 'theme_roots' ); // this is set in get_theme()
}
return $theme_roots;
}
/**
* Retrieve theme data.
*
* @since 1.5.0
*
* @param string $theme Theme name.
* @return array|null Null, if theme name does not exist. Theme data, if exists.
*/
function get_theme($theme) {
$themes = get_themes();
if ( array_key_exists($theme, $themes) )
return $themes[$theme];
return null;
}
/**
* Retrieve current theme display name.
*
* If the 'current_theme' option has already been set, then it will be returned
* instead. If it is not set, then each theme will be iterated over until both
* the current stylesheet and current template name.
*
* @since 1.5.0
*
* @return string
*/
function get_current_theme() {
if ( $theme = get_option('current_theme') )
return $theme;
$themes = get_themes();
$theme_names = array_keys($themes);
$current_template = get_option('template');
$current_stylesheet = get_option('stylesheet');
$current_theme = 'Twenty Ten';
if ( $themes ) {
foreach ( (array) $theme_names as $theme_name ) {
if ( $themes[$theme_name]['Stylesheet'] == $current_stylesheet &&
$themes[$theme_name]['Template'] == $current_template ) {
$current_theme = $themes[$theme_name]['Name'];
break;
}
}
}
update_option('current_theme', $current_theme);
return $current_theme;
}
/**
* Register a directory that contains themes.
*
* @since 2.9.0
*
* @param string $directory Either the full filesystem path to a theme folder or a folder within WP_CONTENT_DIR
* @return bool
*/
function register_theme_directory( $directory) {
global $wp_theme_directories;
/* If this folder does not exist, return and do not register */
if ( !file_exists( $directory ) )
/* Try prepending as the theme directory could be relative to the content directory */
$registered_directory = WP_CONTENT_DIR . '/' . $directory;
else
$registered_directory = $directory;
/* If this folder does not exist, return and do not register */
if ( !file_exists( $registered_directory ) )
return false;
$wp_theme_directories[] = $registered_directory;
return true;
}
/**
* Search all registered theme directories for complete and valid themes.
*
* @since 2.9.0
*
* @return array Valid themes found
*/
function search_theme_directories() {
global $wp_theme_directories, $wp_broken_themes;
if ( empty( $wp_theme_directories ) )
return false;
$theme_files = array();
$wp_broken_themes = array();
/* Loop the registered theme directories and extract all themes */
foreach ( (array) $wp_theme_directories as $theme_root ) {
$theme_loc = $theme_root;
/* We don't want to replace all forward slashes, see Trac #4541 */
if ( '/' != WP_CONTENT_DIR )
$theme_loc = str_replace(WP_CONTENT_DIR, '', $theme_root);
/* Files in the root of the current theme directory and one subdir down */
$themes_dir = @ opendir($theme_root);
if ( !$themes_dir )
return false;
while ( ($theme_dir = readdir($themes_dir)) !== false ) {
if ( is_dir($theme_root . '/' . $theme_dir) && is_readable($theme_root . '/' . $theme_dir) ) {
if ( $theme_dir[0] == '.' || $theme_dir == 'CVS' )
continue;
$stylish_dir = @opendir($theme_root . '/' . $theme_dir);
$found_stylesheet = false;
while ( ($theme_file = readdir($stylish_dir)) !== false ) {
if ( $theme_file == 'style.css' ) {
$theme_files[$theme_dir] = array( 'theme_file' => $theme_dir . '/' . $theme_file, 'theme_root' => $theme_root );
$found_stylesheet = true;
break;
}
}
@closedir($stylish_dir);
if ( !$found_stylesheet ) { // look for themes in that dir
$subdir = "$theme_root/$theme_dir";
$subdir_name = $theme_dir;
$theme_subdirs = @opendir( $subdir );
$found_subdir_themes = false;
while ( ($theme_subdir = readdir($theme_subdirs)) !== false ) {
if ( is_dir( $subdir . '/' . $theme_subdir) && is_readable($subdir . '/' . $theme_subdir) ) {
if ( $theme_subdir[0] == '.' || $theme_subdir == 'CVS' )
continue;
$stylish_dir = @opendir($subdir . '/' . $theme_subdir);
$found_stylesheet = false;
while ( ($theme_file = readdir($stylish_dir)) !== false ) {
if ( $theme_file == 'style.css' ) {
$theme_files["$theme_dir/$theme_subdir"] = array( 'theme_file' => $subdir_name . '/' . $theme_subdir . '/' . $theme_file, 'theme_root' => $theme_root );
$found_stylesheet = true;
$found_subdir_themes = true;
break;
}
}
@closedir($stylish_dir);
}
}
@closedir($theme_subdirs);
if ( !$found_subdir_themes )
$wp_broken_themes[$theme_dir] = array('Name' => $theme_dir, 'Title' => $theme_dir, 'Description' => __('Stylesheet is missing.'));
}
}
}
@closedir( $themes_dir );
}
return $theme_files;
}
/**
* Retrieve path to themes directory.
*
* Does not have trailing slash.
*
* @since 1.5.0
* @uses apply_filters() Calls 'theme_root' filter on path.
*
* @param string $stylesheet_or_template The stylesheet or template name of the theme
* @return string Theme path.
*/
function get_theme_root( $stylesheet_or_template = false ) {
if ( $stylesheet_or_template ) {
if ( $theme_root = get_raw_theme_root($stylesheet_or_template) )
$theme_root = WP_CONTENT_DIR . $theme_root;
else
$theme_root = WP_CONTENT_DIR . '/themes';
} else {
$theme_root = WP_CONTENT_DIR . '/themes';
}
return apply_filters( 'theme_root', $theme_root );
}
/**
* Retrieve URI for themes directory.
*
* Does not have trailing slash.
*
* @since 1.5.0
*
* @param string $stylesheet_or_template The stylesheet or template name of the theme
* @return string Themes URI.
*/
function get_theme_root_uri( $stylesheet_or_template = false ) {
if ( $stylesheet_or_template ) {
if ( $theme_root = get_raw_theme_root($stylesheet_or_template) )
$theme_root_uri = content_url( $theme_root );
else
$theme_root_uri = content_url( 'themes' );
} else {
$theme_root_uri = content_url( 'themes' );
}
return apply_filters( 'theme_root_uri', $theme_root_uri, get_option('siteurl'), $stylesheet_or_template );
}
/**
* Get the raw theme root relative to the content directory with no filters applied.
*
* @since 3.1.0
*
* @param string $stylesheet_or_template The stylesheet or template name of the theme
* @return string Theme root
*/
function get_raw_theme_root( $stylesheet_or_template, $no_cache = false ) {
global $wp_theme_directories;
if ( count($wp_theme_directories) <= 1 )
return '/themes';
$theme_root = false;
// If requesting the root for the current theme, consult options to avoid calling get_theme_roots()
if ( !$no_cache ) {
if ( get_option('stylesheet') == $stylesheet_or_template )
$theme_root = get_option('stylesheet_root');
elseif ( get_option('template') == $stylesheet_or_template )
$theme_root = get_option('template_root');
}
if ( empty($theme_root) ) {
$theme_roots = get_theme_roots();
if ( !empty($theme_roots[$stylesheet_or_template]) )
$theme_root = $theme_roots[$stylesheet_or_template];
}
return $theme_root;
}
/**
* Retrieve path to a template
*
* Used to quickly retrieve the path of a template without including the file
* extension. It will also check the parent theme, if the file exists, with
* the use of {@link locate_template()}. Allows for more generic template location
* without the use of the other get_*_template() functions.
*
* @since 1.5.0
*
* @param string $type Filename without extension.
* @param array $templates An optional list of template candidates
* @return string Full path to file.
*/
function get_query_template( $type, $templates = array() ) {
$type = preg_replace( '|[^a-z0-9-]+|', '', $type );
if ( empty( $templates ) )
$templates = array("{$type}.php");
$templates = apply_filters( "{$type}_template_hierarchy", $templates );
return apply_filters( "{$type}_template", locate_template( $templates ) );
}
/**
* Retrieve path of index template in current or parent template.
*
* @since 3.0.0
*
* @return string
*/
function get_index_template() {
return get_query_template('index');
}
/**
* Retrieve path of 404 template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_404_template() {
return get_query_template('404');
}
/**
* Retrieve path of archive template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_archive_template() {
$post_type = get_query_var( 'post_type' );
$templates = array();
if ( $post_type )
$templates[] = "archive-{$post_type}.php";
$templates[] = 'archive.php';
return get_query_template( 'archive', $templates );
}
/**
* Retrieve path of author template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_author_template() {
$author = get_queried_object();
$templates = array();
$templates[] = "author-{$author->user_nicename}.php";
$templates[] = "author-{$author->ID}.php";
$templates[] = 'author.php';
return get_query_template( 'author', $templates );
}
/**
* Retrieve path of category template in current or parent template.
*
* Works by first retrieving the current slug for example 'category-default.php' and then
* trying category ID, for example 'category-1.php' and will finally fallback to category.php
* template, if those files don't exist.
*
* @since 1.5.0
* @uses apply_filters() Calls 'category_template' on file path of category template.
*
* @return string
*/
function get_category_template() {
$category = get_queried_object();
$templates = array();
$templates[] = "category-{$category->slug}.php";
$templates[] = "category-{$category->term_id}.php";
$templates[] = "category.php";
return get_query_template( 'category', $templates );
}
/**
* Retrieve path of tag template in current or parent template.
*
* Works by first retrieving the current tag name, for example 'tag-wordpress.php' and then
* trying tag ID, for example 'tag-1.php' and will finally fallback to tag.php
* template, if those files don't exist.
*
* @since 2.3.0
* @uses apply_filters() Calls 'tag_template' on file path of tag template.
*
* @return string
*/
function get_tag_template() {
$tag = get_queried_object();
$templates = array();
$templates[] = "tag-{$tag->slug}.php";
$templates[] = "tag-{$tag->term_id}.php";
$templates[] = "tag.php";
return get_query_template( 'tag', $templates );
}
/**
* Retrieve path of taxonomy template in current or parent template.
*
* Retrieves the taxonomy and term, if term is available. The template is
* prepended with 'taxonomy-' and followed by both the taxonomy string and
* the taxonomy string followed by a dash and then followed by the term.
*
* The taxonomy and term template is checked and used first, if it exists.
* Second, just the taxonomy template is checked, and then finally, taxonomy.php
* template is used. If none of the files exist, then it will fall back on to
* index.php.
*
* @since 2.5.0
* @uses apply_filters() Calls 'taxonomy_template' filter on found path.
*
* @return string
*/
function get_taxonomy_template() {
$term = get_queried_object();
$taxonomy = $term->taxonomy;
$templates = array();
$templates[] = "taxonomy-$taxonomy-{$term->slug}.php";
$templates[] = "taxonomy-$taxonomy.php";
$templates[] = "taxonomy.php";
return get_query_template( 'taxonomy', $templates );
}
/**
* Retrieve path of date template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_date_template() {
return get_query_template('date');
}
/**
* Retrieve path of home template in current or parent template.
*
* This is the template used for the page containing the blog posts
*
* Attempts to locate 'home.php' first before falling back to 'index.php'.
*
* @since 1.5.0
* @uses apply_filters() Calls 'home_template' on file path of home template.
*
* @return string
*/
function get_home_template() {
$templates = array( 'home.php', 'index.php' );
return get_query_template( 'home', $templates );
}
/**
* Retrieve path of front-page template in current or parent template.
*
* Looks for 'front-page.php'.
*
* @since 3.0.0
* @uses apply_filters() Calls 'front_page_template' on file path of template.
*
* @return string
*/
function get_front_page_template() {
$templates = array('front-page.php');
return get_query_template( 'front_page', $templates );
}
/**
* Retrieve path of page template in current or parent template.
*
* Will first look for the specifically assigned page template
* The will search for 'page-{slug}.php' followed by 'page-id.php'
* and finally 'page.php'
*
* @since 1.5.0
*
* @return string
*/
function get_page_template() {
$id = get_queried_object_id();
$template = get_post_meta($id, '_wp_page_template', true);
$pagename = get_query_var('pagename');
if ( !$pagename && $id > 0 ) {
// If a static page is set as the front page, $pagename will not be set. Retrieve it from the queried object
$post = get_queried_object();
$pagename = $post->post_name;
}
if ( 'default' == $template )
$template = '';
$templates = array();
if ( !empty($template) && !validate_file($template) )
$templates[] = $template;
if ( $pagename )
$templates[] = "page-$pagename.php";
if ( $id )
$templates[] = "page-$id.php";
$templates[] = "page.php";
return get_query_template( 'page', $templates );
}
/**
* Retrieve path of paged template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_paged_template() {
return get_query_template('paged');
}
/**
* Retrieve path of search template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_search_template() {
return get_query_template('search');
}
/**
* Retrieve path of single template in current or parent template.
*
* @since 1.5.0
*
* @return string
*/
function get_single_template() {
$object = get_queried_object();
$templates = array();
$templates[] = "single-{$object->post_type}.php";
$templates[] = "single.php";
return get_query_template( 'single', $templates );
}
/**
* Retrieve path of attachment template in current or parent template.
*
* The attachment path first checks if the first part of the mime type exists.
* The second check is for the second part of the mime type. The last check is
* for both types separated by an underscore. If neither are found then the file
* 'attachment.php' is checked and returned.
*
* Some examples for the 'text/plain' mime type are 'text.php', 'plain.php', and
* finally 'text_plain.php'.
*
* @since 2.0.0
*
* @return string
*/
function get_attachment_template() {
global $posts;
$type = explode('/', $posts[0]->post_mime_type);
if ( $template = get_query_template($type[0]) )
return $template;
elseif ( $template = get_query_template($type[1]) )
return $template;
elseif ( $template = get_query_template("$type[0]_$type[1]") )
return $template;
else
return get_query_template('attachment');
}
/**
* Retrieve path of comment popup template in current or parent template.
*
* Checks for comment popup template in current template, if it exists or in the
* parent template.
*
* @since 1.5.0
* @uses apply_filters() Calls 'comments_popup_template' filter on path.
*
* @return string
*/
function get_comments_popup_template() {
$template = get_query_template( 'comments_popup', array( 'comments-popup.php' ) );
// Backward compat code will be removed in a future release
if ('' == $template)
$template = ABSPATH . WPINC . '/theme-compat/comments-popup.php';
return $template;
}
/**
* Retrieve the name of the highest priority template file that exists.
*
* Searches in the STYLESHEETPATH before TEMPLATEPATH so that themes which
* inherit from a parent theme can just overload one file.
*
* @since 2.7.0
*
* @param string|array $template_names Template file(s) to search for, in order.
* @param bool $load If true the template file will be loaded if it is found.
* @param bool $require_once Whether to require_once or require. Default true. Has no effect if $load is false.
* @return string The template filename if one is located.
*/
function locate_template($template_names, $load = false, $require_once = true ) {
$located = '';
foreach ( (array) $template_names as $template_name ) {
if ( !$template_name )
continue;
if ( file_exists(STYLESHEETPATH . '/' . $template_name)) {
$located = STYLESHEETPATH . '/' . $template_name;
break;
} else if ( file_exists(TEMPLATEPATH . '/' . $template_name) ) {
$located = TEMPLATEPATH . '/' . $template_name;
break;
}
}
if ( $load && '' != $located )
load_template( $located, $require_once );
return $located;
}
/**
* Require the template file with WordPress environment.
*
* The globals are set up for the template file to ensure that the WordPress
* environment is available from within the function. The query variables are
* also available.
*
* @since 1.5.0
*
* @param string $_template_file Path to template file.
* @param bool $require_once Whether to require_once or require. Default true.
*/
function load_template( $_template_file, $require_once = true ) {
global $posts, $post, $wp_did_header, $wp_did_template_redirect, $wp_query, $wp_rewrite, $wpdb, $wp_version, $wp, $id, $comment, $user_ID;
if ( is_array( $wp_query->query_vars ) )
extract( $wp_query->query_vars, EXTR_SKIP );
if ( $require_once )
require_once( $_template_file );
else
require( $_template_file );
}
/**
* Display localized stylesheet link element.
*
* @since 2.1.0
*/
function locale_stylesheet() {
$stylesheet = get_locale_stylesheet_uri();
if ( empty($stylesheet) )
return;
echo '<link rel="stylesheet" href="' . $stylesheet . '" type="text/css" media="screen" />';
}
/**
* Start preview theme output buffer.
*
* Will only preform task if the user has permissions and template and preview
* query variables exist.
*
* @since 2.6.0
*/
function preview_theme() {
if ( ! (isset($_GET['template']) && isset($_GET['preview'])) )
return;
if ( !current_user_can( 'switch_themes' ) )
return;
// Admin Thickbox requests
if ( isset( $_GET['preview_iframe'] ) )
show_admin_bar( false );
$_GET['template'] = preg_replace('|[^a-z0-9_./-]|i', '', $_GET['template']);
if ( validate_file($_GET['template']) )
return;
add_filter( 'template', '_preview_theme_template_filter' );
if ( isset($_GET['stylesheet']) ) {
$_GET['stylesheet'] = preg_replace('|[^a-z0-9_./-]|i', '', $_GET['stylesheet']);
if ( validate_file($_GET['stylesheet']) )
return;
add_filter( 'stylesheet', '_preview_theme_stylesheet_filter' );
}
// Prevent theme mods to current theme being used on theme being previewed
add_filter( 'pre_option_mods_' . get_current_theme(), '__return_empty_array' );
ob_start( 'preview_theme_ob_filter' );
}
add_action('setup_theme', 'preview_theme');
/**
* Private function to modify the current template when previewing a theme
*
* @since 2.9.0
* @access private
*
* @return string
*/
function _preview_theme_template_filter() {
return isset($_GET['template']) ? $_GET['template'] : '';
}
/**
* Private function to modify the current stylesheet when previewing a theme
*
* @since 2.9.0
* @access private
*
* @return string
*/
function _preview_theme_stylesheet_filter() {
return isset($_GET['stylesheet']) ? $_GET['stylesheet'] : '';
}
/**
* Callback function for ob_start() to capture all links in the theme.
*
* @since 2.6.0
* @access private
*
* @param string $content
* @return string
*/
function preview_theme_ob_filter( $content ) {
return preg_replace_callback( "|(<a.*?href=([\"']))(.*?)([\"'].*?>)|", 'preview_theme_ob_filter_callback', $content );
}
/**
* Manipulates preview theme links in order to control and maintain location.
*
* Callback function for preg_replace_callback() to accept and filter matches.
*
* @since 2.6.0
* @access private
*
* @param array $matches
* @return string
*/
function preview_theme_ob_filter_callback( $matches ) {
if ( strpos($matches[4], 'onclick') !== false )
$matches[4] = preg_replace('#onclick=([\'"]).*?(?<!\\\)\\1#i', '', $matches[4]); //Strip out any onclicks from rest of <a>. (?<!\\\) means to ignore the '" if its escaped by \ to prevent breaking mid-attribute.
if (
( false !== strpos($matches[3], '/wp-admin/') )
||
( false !== strpos( $matches[3], '://' ) && 0 !== strpos( $matches[3], home_url() ) )
||
( false !== strpos($matches[3], '/feed/') )
||
( false !== strpos($matches[3], '/trackback/') )
)
return $matches[1] . "#$matches[2] onclick=$matches[2]return false;" . $matches[4];
$link = add_query_arg( array('preview' => 1, 'template' => $_GET['template'], 'stylesheet' => @$_GET['stylesheet'] ), $matches[3] );
if ( 0 === strpos($link, 'preview=1') )
$link = "?$link";
return $matches[1] . esc_attr( $link ) . $matches[4];
}
/**
* Switches current theme to new template and stylesheet names.
*
* @since 2.5.0
* @uses do_action() Calls 'switch_theme' action on updated theme display name.
*
* @param string $template Template name
* @param string $stylesheet Stylesheet name.
*/
function switch_theme($template, $stylesheet) {
global $wp_theme_directories;
update_option('template', $template);
update_option('stylesheet', $stylesheet);
if ( count($wp_theme_directories) > 1 ) {
update_option('template_root', get_raw_theme_root($template, true));
update_option('stylesheet_root', get_raw_theme_root($stylesheet, true));
}
delete_option('current_theme');
$theme = get_current_theme();
if ( is_admin() && false === get_option( "theme_mods_$stylesheet" ) ) {
$default_theme_mods = (array) get_option( "mods_$theme" );
add_option( "theme_mods_$stylesheet", $default_theme_mods );
}
do_action('switch_theme', $theme);
}
/**
* Checks that current theme files 'index.php' and 'style.css' exists.
*
* Does not check the default theme, which is the fallback and should always exist.
* Will switch theme to the fallback theme if current theme does not validate.
* You can use the 'validate_current_theme' filter to return FALSE to
* disable this functionality.
*
* @since 1.5.0
* @see WP_DEFAULT_THEME
*
* @return bool
*/
function validate_current_theme() {
// Don't validate during an install/upgrade.
if ( defined('WP_INSTALLING') || !apply_filters( 'validate_current_theme', true ) )
return true;
if ( get_template() != WP_DEFAULT_THEME && !file_exists(get_template_directory() . '/index.php') ) {
switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
return false;
}
if ( get_stylesheet() != WP_DEFAULT_THEME && !file_exists(get_template_directory() . '/style.css') ) {
switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
return false;
}
if ( is_child_theme() && ! file_exists( get_stylesheet_directory() . '/style.css' ) ) {
switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
return false;
}
return true;
}
/**
* Retrieve all theme modifications.
*
* @since 3.1.0
*
* @return array Theme modifications.
*/
function get_theme_mods() {
$theme_slug = get_option( 'stylesheet' );
if ( false === ( $mods = get_option( "theme_mods_$theme_slug" ) ) ) {
$theme_name = get_current_theme();
$mods = get_option( "mods_$theme_name" ); // Deprecated location.
if ( is_admin() && false !== $mods ) {
update_option( "theme_mods_$theme_slug", $mods );
delete_option( "mods_$theme_name" );
}
}
return $mods;
}
/**
* Retrieve theme modification value for the current theme.
*
* If the modification name does not exist, then the $default will be passed
* through {@link http://php.net/sprintf sprintf()} PHP function with the first
* string the template directory URI and the second string the stylesheet
* directory URI.
*
* @since 2.1.0
* @uses apply_filters() Calls 'theme_mod_$name' filter on the value.
*
* @param string $name Theme modification name.
* @param bool|string $default
* @return string
*/
function get_theme_mod( $name, $default = false ) {
$mods = get_theme_mods();
if ( isset( $mods[ $name ] ) )
return apply_filters( "theme_mod_$name", $mods[ $name ] );
return apply_filters( "theme_mod_$name", sprintf( $default, get_template_directory_uri(), get_stylesheet_directory_uri() ) );
}
/**
* Update theme modification value for the current theme.
*
* @since 2.1.0
*
* @param string $name Theme modification name.
* @param string $value theme modification value.
*/
function set_theme_mod( $name, $value ) {
$mods = get_theme_mods();
$mods[ $name ] = $value;
$theme = get_option( 'stylesheet' );
update_option( "theme_mods_$theme", $mods );
}
/**
* Remove theme modification name from current theme list.
*
* If removing the name also removes all elements, then the entire option will
* be removed.
*
* @since 2.1.0
*
* @param string $name Theme modification name.
* @return null
*/
function remove_theme_mod( $name ) {
$mods = get_theme_mods();
if ( ! isset( $mods[ $name ] ) )
return;
unset( $mods[ $name ] );
if ( empty( $mods ) )
return remove_theme_mods();
$theme = get_option( 'stylesheet' );
update_option( "theme_mods_$theme", $mods );
}
/**
* Remove theme modifications option for current theme.
*
* @since 2.1.0
*/
function remove_theme_mods() {
delete_option( 'theme_mods_' . get_option( 'stylesheet' ) );
delete_option( 'mods_' . get_current_theme() );
}
/**
* Retrieve text color for custom header.
*
* @since 2.1.0
* @uses HEADER_TEXTCOLOR
*
* @return string
*/
function get_header_textcolor() {
$default = defined('HEADER_TEXTCOLOR') ? HEADER_TEXTCOLOR : '';
return get_theme_mod('header_textcolor', $default);
}
/**
* Display text color for custom header.
*
* @since 2.1.0
*/
function header_textcolor() {
echo get_header_textcolor();
}
/**
* Retrieve header image for custom header.
*
* @since 2.1.0
* @uses HEADER_IMAGE
*
* @return string
*/
function get_header_image() {
$default = defined( 'HEADER_IMAGE' ) ? HEADER_IMAGE : '';
$url = get_theme_mod( 'header_image', $default );
if ( is_ssl() )
$url = str_replace( 'http://', 'https://', $url );
else
$url = str_replace( 'https://', 'http://', $url );
return $url;
}
/**
* Display header image path.
*
* @since 2.1.0
*/
function header_image() {
echo get_header_image();
}
/**
* Add callbacks for image header display.
*
* The parameter $header_callback callback will be required to display the
* content for the 'wp_head' action. The parameter $admin_header_callback
* callback will be added to Custom_Image_Header class and that will be added
* to the 'admin_menu' action.
*
* @since 2.1.0
* @uses Custom_Image_Header Sets up for $admin_header_callback for administration panel display.
*
* @param callback $header_callback Call on 'wp_head' action.
* @param callback $admin_header_callback Call on custom header administration screen.
* @param callback $admin_image_div_callback Output a custom header image div on the custom header administration screen. Optional.
*/
function add_custom_image_header( $header_callback, $admin_header_callback, $admin_image_div_callback = '' ) {
if ( ! empty( $header_callback ) )
add_action('wp_head', $header_callback);
add_theme_support( 'custom-header', array( 'callback' => $header_callback ) );
add_theme_support( 'custom-header-uploads' );
if ( ! is_admin() )
return;
global $custom_image_header;
require_once( ABSPATH . 'wp-admin/custom-header.php' );
$custom_image_header = new Custom_Image_Header( $admin_header_callback, $admin_image_div_callback );
add_action( 'admin_menu', array( &$custom_image_header, 'init' ) );
}
/**
* Remove image header support.
*
* @since 3.1.0
* @see add_custom_image_header()
*
* @return bool Whether support was removed.
*/
function remove_custom_image_header() {
if ( ! current_theme_supports( 'custom-header' ) )
return false;
$callback = get_theme_support( 'custom-header' );
remove_action( 'wp_head', $callback[0]['callback'] );
_remove_theme_support( 'custom-header' );
remove_theme_support( 'custom-header-uploads' );
if ( is_admin() ) {
remove_action( 'admin_menu', array( &$GLOBALS['custom_image_header'], 'init' ) );
unset( $GLOBALS['custom_image_header'] );
}
return true;
}
/**
* Register a selection of default headers to be displayed by the custom header admin UI.
*
* @since 3.0.0
*
* @param array $headers Array of headers keyed by a string id. The ids point to arrays containing 'url', 'thumbnail_url', and 'description' keys.
*/
function register_default_headers( $headers ) {
global $_wp_default_headers;
$_wp_default_headers = array_merge( (array) $_wp_default_headers, (array) $headers );
}
/**
* Unregister default headers.
*
* This function must be called after register_default_headers() has already added the
* header you want to remove.
*
* @see register_default_headers()
* @since 3.0.0
*
* @param string|array $header The header string id (key of array) to remove, or an array thereof.
* @return True on success, false on failure.
*/
function unregister_default_headers( $header ) {
global $_wp_default_headers;
if ( is_array( $header ) ) {
array_map( 'unregister_default_headers', $header );
} elseif ( isset( $_wp_default_headers[ $header ] ) ) {
unset( $_wp_default_headers[ $header ] );
return true;
} else {
return false;
}
}
/**
* Retrieve background image for custom background.
*
* @since 3.0.0
*
* @return string
*/
function get_background_image() {
$default = defined('BACKGROUND_IMAGE') ? BACKGROUND_IMAGE : '';
return get_theme_mod('background_image', $default);
}
/**
* Display background image path.
*
* @since 3.0.0
*/
function background_image() {
echo get_background_image();
}
/**
* Retrieve value for custom background color.
*
* @since 3.0.0
* @uses BACKGROUND_COLOR
*
* @return string
*/
function get_background_color() {
$default = defined('BACKGROUND_COLOR') ? BACKGROUND_COLOR : '';
return get_theme_mod('background_color', $default);
}
/**
* Display background color value.
*
* @since 3.0.0
*/
function background_color() {
echo get_background_color();
}
/**
* Add callbacks for background image display.
*
* The parameter $header_callback callback will be required to display the
* content for the 'wp_head' action. The parameter $admin_header_callback
* callback will be added to Custom_Background class and that will be added
* to the 'admin_menu' action.
*
* @since 3.0.0
* @uses Custom_Background Sets up for $admin_header_callback for administration panel display.
*
* @param callback $header_callback Call on 'wp_head' action.
* @param callback $admin_header_callback Call on custom background administration screen.
* @param callback $admin_image_div_callback Output a custom background image div on the custom background administration screen. Optional.
*/
function add_custom_background( $header_callback = '', $admin_header_callback = '', $admin_image_div_callback = '' ) {
if ( isset( $GLOBALS['custom_background'] ) )
return;
if ( empty( $header_callback ) )
$header_callback = '_custom_background_cb';
add_action( 'wp_head', $header_callback );
add_theme_support( 'custom-background', array( 'callback' => $header_callback ) );
if ( ! is_admin() )
return;
require_once( ABSPATH . 'wp-admin/custom-background.php' );
$GLOBALS['custom_background'] =& new Custom_Background( $admin_header_callback, $admin_image_div_callback );
add_action( 'admin_menu', array( &$GLOBALS['custom_background'], 'init' ) );
}
/**
* Remove custom background support.
*
* @since 3.1.0
* @see add_custom_background()
*
* @return bool Whether support was removed.
*/
function remove_custom_background() {
if ( ! current_theme_supports( 'custom-background' ) )
return false;
$callback = get_theme_support( 'custom-background' );
remove_action( 'wp_head', $callback[0]['callback'] );
_remove_theme_support( 'custom-background' );
if ( is_admin() ) {
remove_action( 'admin_menu', array( &$GLOBALS['custom_background'], 'init' ) );
unset( $GLOBALS['custom_background'] );
}
return true;
}
/**
* Default custom background callback.
*
* @since 3.0.0
* @see add_custom_background()
* @access protected
*/
function _custom_background_cb() {
$background = get_background_image();
$color = get_background_color();
if ( ! $background && ! $color )
return;
$style = $color ? "background-color: #$color;" : '';
if ( $background ) {
$image = " background-image: url('$background');";
$repeat = get_theme_mod( 'background_repeat', 'repeat' );
if ( ! in_array( $repeat, array( 'no-repeat', 'repeat-x', 'repeat-y', 'repeat' ) ) )
$repeat = 'repeat';
$repeat = " background-repeat: $repeat;";
$position = get_theme_mod( 'background_position_x', 'left' );
if ( ! in_array( $position, array( 'center', 'right', 'left' ) ) )
$position = 'left';
$position = " background-position: top $position;";
$attachment = get_theme_mod( 'background_attachment', 'scroll' );
if ( ! in_array( $attachment, array( 'fixed', 'scroll' ) ) )
$attachment = 'scroll';
$attachment = " background-attachment: $attachment;";
$style .= $image . $repeat . $position . $attachment;
}
?>
<style type="text/css">
body { <?php echo trim( $style ); ?> }
</style>
<?php
}
/**
* Add callback for custom TinyMCE editor stylesheets.
*
* The parameter $stylesheet is the name of the stylesheet, relative to
* the theme root. It also accepts an array of stylesheets.
* It is optional and defaults to 'editor-style.css'.
*
* Supports RTL stylesheets automatically by searching for the -rtl prefix, e.g.
* editor-style-rtl.css. If an array of stylesheets is passed to add_editor_style(),
* RTL is only added for the first stylesheet.
*
* @since 3.0.0
*
* @param mixed $stylesheet Optional. Stylesheet name or array thereof, relative to theme root.
* Defaults to 'editor-style.css'
*/
function add_editor_style( $stylesheet = 'editor-style.css' ) {
add_theme_support( 'editor-style' );
if ( ! is_admin() )
return;
global $editor_styles;
$editor_styles = (array) $editor_styles;
$stylesheet = (array) $stylesheet;
if ( is_rtl() ) {
$rtl_stylesheet = str_replace('.css', '-rtl.css', $stylesheet[0]);
$stylesheet[] = $rtl_stylesheet;
}
$editor_styles = array_merge( $editor_styles, $stylesheet );
}
/**
* Removes all visual editor stylesheets.
*
* @since 3.1.0
*
* @return bool True on success, false if there were no stylesheets to remove.
*/
function remove_editor_styles() {
if ( ! current_theme_supports( 'editor-style' ) )
return false;
_remove_theme_support( 'editor-style' );
if ( is_admin() )
$GLOBALS['editor_styles'] = array();
return true;
}
/**
* Allows a theme to register its support of a certain feature
*
* Must be called in the theme's functions.php file to work.
* If attached to a hook, it must be after_setup_theme.
* The init hook may be too late for some features.
*
* @since 2.9.0
* @param string $feature the feature being added
*/
function add_theme_support( $feature ) {
global $_wp_theme_features;
if ( func_num_args() == 1 )
$_wp_theme_features[$feature] = true;
else
$_wp_theme_features[$feature] = array_slice( func_get_args(), 1 );
if ( $feature == 'post-formats' && is_array( $_wp_theme_features[$feature][0] ) )
$_wp_theme_features[$feature][0] = array_intersect( $_wp_theme_features[$feature][0], array_keys( get_post_format_slugs() ) );
}
/**
* Gets the theme support arguments passed when registering that support
*
* @since 3.1
* @param string $feature the feature to check
* @return array The array of extra arguments
*/
function get_theme_support( $feature ) {
global $_wp_theme_features;
if ( !isset( $_wp_theme_features[$feature] ) )
return false;
else
return $_wp_theme_features[$feature];
}
/**
* Allows a theme to de-register its support of a certain feature
*
* Should be called in the theme's functions.php file. Generally would
* be used for child themes to override support from the parent theme.
*
* @since 3.0.0
* @see add_theme_support()
* @param string $feature the feature being added
* @return bool Whether feature was removed.
*/
function remove_theme_support( $feature ) {
// Blacklist: for internal registrations not used directly by themes.
if ( in_array( $feature, array( 'custom-background', 'custom-header', 'editor-style', 'widgets', 'menus' ) ) )
return false;
return _remove_theme_support( $feature );
}
/**
* Do not use. Removes theme support internally, ignorant of the blacklist.
*
* @access private
* @since 3.1.0
*/
function _remove_theme_support( $feature ) {
global $_wp_theme_features;
if ( ! isset( $_wp_theme_features[$feature] ) )
return false;
unset( $_wp_theme_features[$feature] );
return true;
}
/**
* Checks a theme's support for a given feature
*
* @since 2.9.0
* @param string $feature the feature being checked
* @return boolean
*/
function current_theme_supports( $feature ) {
global $_wp_theme_features;
if ( !isset( $_wp_theme_features[$feature] ) )
return false;
// If no args passed then no extra checks need be performed
if ( func_num_args() <= 1 )
return true;
$args = array_slice( func_get_args(), 1 );
// @todo Allow pluggable arg checking
switch ( $feature ) {
case 'post-thumbnails':
// post-thumbnails can be registered for only certain content/post types by passing
// an array of types to add_theme_support(). If no array was passed, then
// any type is accepted
if ( true === $_wp_theme_features[$feature] ) // Registered for all types
return true;
$content_type = $args[0];
if ( in_array($content_type, $_wp_theme_features[$feature][0]) )
return true;
else
return false;
break;
}
return true;
}
/**
* Checks a theme's support for a given feature before loading the functions which implement it.
*
* @since 2.9.0
* @param string $feature the feature being checked
* @param string $include the file containing the functions that implement the feature
*/
function require_if_theme_supports( $feature, $include) {
if ( current_theme_supports( $feature ) )
require ( $include );
}
/**
* Checks an attachment being deleted to see if it's a header or background image.
*
* If true it removes the theme modification which would be pointing at the deleted
* attachment
*
* @access private
* @since 3.0.0
* @param int $id the attachment id
*/
function _delete_attachment_theme_mod( $id ) {
$attachment_image = wp_get_attachment_url( $id );
$header_image = get_header_image();
$background_image = get_background_image();
if ( $header_image && $header_image == $attachment_image )
remove_theme_mod( 'header_image' );
if ( $background_image && $background_image == $attachment_image )
remove_theme_mod( 'background_image' );
}
add_action( 'delete_attachment', '_delete_attachment_theme_mod' );
?>