Wordpress/wp-content/themes/twentythirteen/inc/back-compat.php

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<?php
/**
* Twenty Thirteen back compat functionality.
*
* Prevents Twenty Thirteen from running on WordPress versions prior to 3.6,
* since this theme is not meant to be backwards compatible and relies on
* many new functions and markup changes introduced in 3.6.
*
* @package WordPress
* @subpackage Twenty_Thirteen
* @since Twenty Thirteen 1.0
*/
/**
* Prevent switching to Twenty Thirteen on old versions of WordPress. Switches
* to the previously activated theme or the default theme.
*
* @since Twenty Thirteen 1.0
*
* @param string $theme_name The theme name.
* @param WP_Theme $theme The theme object.
* @return void
*/
function twentythirteen_switch_theme( $theme_name, $theme ) {
if ( 'twentythirteen' != $theme->get_template() )
switch_theme( $theme->get_template(), $theme->get_stylesheet() );
elseif ( 'twentythirteen' != WP_DEFAULT_THEME )
switch_theme( WP_DEFAULT_THEME );
unset( $_GET['activated'] );
add_action( 'admin_notices', 'twentythirteen_upgrade_notice' );
}
add_action( 'after_switch_theme', 'twentythirteen_switch_theme', 10, 2 );
/**
* Prints an update nag after an unsuccessful attempt to switch to
* Twenty Thirteen on WordPress versions prior to 3.6.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_upgrade_notice() {
$message = sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] );
printf( '<div class="error"><p>%s</p></div>', $message );
}
/**
* Prevents the Customizer from being loaded on WordPress versions prior to 3.6.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_customize() {
wp_die( sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ) . sprintf( ' <a href="javascript:history.go(-1);">%s</a>', __( 'Go back.', 'twentythirteen' ) ) );
}
add_action( 'load-customize.php', 'twentythirteen_customize' );