diff --git a/src/wp-admin/admin-header.php b/src/wp-admin/admin-header.php
index 1104029b2f..664b32c7a4 100644
--- a/src/wp-admin/admin-header.php
+++ b/src/wp-admin/admin-header.php
@@ -164,16 +164,19 @@ $admin_body_class .= ' no-customize-support no-svg';
 /**
  * Filter the CSS classes for the body tag in the admin.
  *
- * This filter differs from the post_class or body_class filters in two important ways:
- * 1. $classes is a space-separated string of class names instead of an array.
- * 2. Not all core admin classes are filterable, notably: wp-admin, wp-core-ui, and no-js cannot be removed.
+ * This filter differs from the {@see 'post_class'} and {@see 'body_class'} filters
+ * in two important ways:
+ * 1. `$classes` is a space-separated string of class names instead of an array.
+ * 2. Not all core admin classes are filterable, notably: wp-admin, wp-core-ui,
+ *    and no-js cannot be removed.
  *
  * @since 2.3.0
  *
- * @param string $classes Space-separated string of CSS classes.
+ * @param string $classes Space-separated list of CSS classes.
  */
+$admin_body_classes = apply_filters( 'admin_body_class', '' );
 ?>
-<body class="wp-admin wp-core-ui no-js <?php echo apply_filters( 'admin_body_class', '' ) . " $admin_body_class"; ?>">
+<body class="wp-admin wp-core-ui no-js <?php echo $admin_body_classes . ' ' . $admin_body_class; ?>">
 <script type="text/javascript">
 	document.body.className = document.body.className.replace('no-js','js');
 </script>
diff --git a/src/wp-admin/edit-form-advanced.php b/src/wp-admin/edit-form-advanced.php
index 217eb43356..5acdb87b54 100644
--- a/src/wp-admin/edit-form-advanced.php
+++ b/src/wp-admin/edit-form-advanced.php
@@ -464,8 +464,9 @@ do_action( 'edit_form_top', $post ); ?>
 	 * @param string  $text Placeholder text. Default 'Enter title here'.
 	 * @param WP_Post $post Post object.
 	 */
+	$title_placeholder = apply_filters( 'enter_title_here', __( 'Enter title here' ), $post );
 	?>
-	<label class="screen-reader-text" id="title-prompt-text" for="title"><?php echo apply_filters( 'enter_title_here', __( 'Enter title here' ), $post ); ?></label>
+	<label class="screen-reader-text" id="title-prompt-text" for="title"><?php echo $title_placeholder; ?></label>
 	<input type="text" name="post_title" size="30" value="<?php echo esc_attr( htmlspecialchars( $post->post_title ) ); ?>" id="title" spellcheck="true" autocomplete="off" />
 </div>
 <?php
diff --git a/src/wp-admin/includes/class-wp-links-list-table.php b/src/wp-admin/includes/class-wp-links-list-table.php
index 78d3b42958..3a3906356f 100644
--- a/src/wp-admin/includes/class-wp-links-list-table.php
+++ b/src/wp-admin/includes/class-wp-links-list-table.php
@@ -187,16 +187,18 @@ class WP_Links_List_Table extends WP_List_Table {
 	 					?><td <?php echo $attributes ?>><?php echo $rating; ?></td><?php
 						break;
 					default:
-						/**
-						 * Fires for each registered custom link column.
-						 *
-						 * @since 2.1.0
-						 *
-						 * @param string $column_name Name of the custom column.
-						 * @param int    $link_id     Link ID.
-						 */
 						?>
-						<td <?php echo $attributes ?>><?php do_action( 'manage_link_custom_column', $column_name, $link->link_id ); ?></td>
+						<td <?php echo $attributes ?>><?php
+							/**
+							 * Fires for each registered custom link column.
+							 *
+							 * @since 2.1.0
+							 *
+							 * @param string $column_name Name of the custom column.
+							 * @param int    $link_id     Link ID.
+							 */
+							do_action( 'manage_link_custom_column', $column_name, $link->link_id );
+						?></td>
 						<?php
 						break;
 				}
diff --git a/src/wp-admin/includes/class-wp-media-list-table.php b/src/wp-admin/includes/class-wp-media-list-table.php
index 182f3ec315..d397321fba 100644
--- a/src/wp-admin/includes/class-wp-media-list-table.php
+++ b/src/wp-admin/includes/class-wp-media-list-table.php
@@ -473,21 +473,19 @@ foreach ( $columns as $column_name => $column_display_name ) {
 			break;
 		}
 ?>
-		<td <?php echo $attributes ?>>
-			<?php
-				/**
-				 * Fires for each custom column in the Media list table.
-				 *
-				 * Custom columns are registered using the 'manage_media_columns' filter.
-				 *
-				 * @since 2.5.0
-				 *
-				 * @param string $column_name Name of the custom column.
-				 * @param int    $post_id     Attachment ID.
-				 */
-			?>
-			<?php do_action( 'manage_media_custom_column', $column_name, $post->ID ); ?>
-		</td>
+		<td <?php echo $attributes ?>><?php
+			/**
+			 * Fires for each custom column in the Media list table.
+			 *
+			 * Custom columns are registered using the 'manage_media_columns' filter.
+			 *
+			 * @since 2.5.0
+			 *
+			 * @param string $column_name Name of the custom column.
+			 * @param int    $post_id     Attachment ID.
+			 */
+			do_action( 'manage_media_custom_column', $column_name, $post->ID );
+		?></td>
 <?php
 		break;
 	}
diff --git a/src/wp-admin/includes/export.php b/src/wp-admin/includes/export.php
index f5823d9160..1ffc1d349d 100644
--- a/src/wp-admin/includes/export.php
+++ b/src/wp-admin/includes/export.php
@@ -391,8 +391,10 @@ function export_wp( $args = array() ) {
 		$is_sticky = is_sticky( $post->ID ) ? 1 : 0;
 ?>
 	<item>
-		<?php /** This filter is documented in wp-includes/feed.php */ ?>
-		<title><?php echo apply_filters( 'the_title_rss', $post->post_title ); ?></title>
+		<title><?php
+			/** This filter is documented in wp-includes/feed.php */
+			echo apply_filters( 'the_title_rss', $post->post_title );
+		?></title>
 		<link><?php the_permalink_rss() ?></link>
 		<pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate>
 		<dc:creator><?php echo wxr_cdata( get_the_author_meta( 'login' ) ); ?></dc:creator>
diff --git a/src/wp-admin/includes/template.php b/src/wp-admin/includes/template.php
index b407c5bc40..db50c89f7b 100644
--- a/src/wp-admin/includes/template.php
+++ b/src/wp-admin/includes/template.php
@@ -1585,8 +1585,11 @@ if ( is_rtl() )
 
 ?>
 </head>
-<?php /** This filter is documented in wp-admin/admin-header.php */ ?>
-<body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-admin wp-core-ui no-js iframe <?php echo apply_filters( 'admin_body_class', '' ) . ' ' . $admin_body_class; ?>">
+<?php
+/** This filter is documented in wp-admin/admin-header.php */
+$admin_body_classes = apply_filters( 'admin_body_class', '' );
+?>
+<body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-admin wp-core-ui no-js iframe <?php echo $admin_body_classes . ' ' . $admin_body_class; ?>">
 <script type="text/javascript">
 //<![CDATA[
 (function(){
@@ -1868,19 +1871,23 @@ function _wp_admin_html_begin() {
 	if ( $is_IE )
 		@header('X-UA-Compatible: IE=edge');
 
-/**
- * Fires inside the HTML tag in the admin header.
- *
- * @since 2.2.0
- */
 ?>
 <!DOCTYPE html>
 <!--[if IE 8]>
-<html xmlns="http://www.w3.org/1999/xhtml" class="ie8 <?php echo $admin_html_class; ?>" <?php do_action( 'admin_xml_ns' ); ?> <?php language_attributes(); ?>>
+<html xmlns="http://www.w3.org/1999/xhtml" class="ie8 <?php echo $admin_html_class; ?>" <?php
+	/**
+	 * Fires inside the HTML tag in the admin header.
+	 *
+	 * @since 2.2.0
+	 */
+	do_action( 'admin_xml_ns' );
+?> <?php language_attributes(); ?>>
 <![endif]-->
 <!--[if !(IE 8) ]><!-->
-<?php /** This action is documented in wp-admin/includes/template.php */ ?>
-<html xmlns="http://www.w3.org/1999/xhtml" class="<?php echo $admin_html_class; ?>" <?php do_action( 'admin_xml_ns' ); ?> <?php language_attributes(); ?>>
+<html xmlns="http://www.w3.org/1999/xhtml" class="<?php echo $admin_html_class; ?>" <?php
+	/** This action is documented in wp-admin/includes/template.php */
+	do_action( 'admin_xml_ns' );
+?> <?php language_attributes(); ?>>
 <!--<![endif]-->
 <head>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
diff --git a/src/wp-admin/user-edit.php b/src/wp-admin/user-edit.php
index 56df98f909..e9982de3fd 100644
--- a/src/wp-admin/user-edit.php
+++ b/src/wp-admin/user-edit.php
@@ -233,14 +233,14 @@ if ( ! IS_PROFILE_PAGE ) {
 	<?php }
 } ?>
 </h2>
-<?php
-/**
- * Fires inside the your-profile form tag on the user editing screen.
- *
- * @since 3.0.0
- */
-?>
-<form id="your-profile" action="<?php echo esc_url( self_admin_url( IS_PROFILE_PAGE ? 'profile.php' : 'user-edit.php' ) ); ?>" method="post" novalidate="novalidate"<?php do_action( 'user_edit_form_tag' ); ?>>
+<form id="your-profile" action="<?php echo esc_url( self_admin_url( IS_PROFILE_PAGE ? 'profile.php' : 'user-edit.php' ) ); ?>" method="post" novalidate="novalidate"<?php
+	/**
+	 * Fires inside the your-profile form tag on the user editing screen.
+	 *
+	 * @since 3.0.0
+	 */
+	do_action( 'user_edit_form_tag' );
+?>>
 <?php wp_nonce_field('update-user_' . $user_id) ?>
 <?php if ( $wp_http_referer ) : ?>
 	<input type="hidden" name="wp_http_referer" value="<?php echo esc_url($wp_http_referer); ?>" />
@@ -262,20 +262,20 @@ if ( ! IS_PROFILE_PAGE ) {
 <?php if ( count($_wp_admin_css_colors) > 1 && has_action('admin_color_scheme_picker') ) : ?>
 <tr class="user-admin-color-wrap">
 <th scope="row"><?php _e('Admin Color Scheme')?></th>
-<?php
-/**
- * Fires in the 'Admin Color Scheme' section of the user editing screen.
- *
- * The section is only enabled if a callback is hooked to the action,
- * and if there is more than one defined color scheme for the admin.
- *
- * @since 3.0.0
- * @since 3.8.1 Added `$user_id` parameter.
- *
- * @param int $user_id The user ID.
- */
-?>
-<td><?php do_action( 'admin_color_scheme_picker', $user_id ); ?></td>
+<td><?php
+	/**
+	 * Fires in the 'Admin Color Scheme' section of the user editing screen.
+	 *
+	 * The section is only enabled if a callback is hooked to the action,
+	 * and if there is more than one defined color scheme for the admin.
+	 *
+	 * @since 3.0.0
+	 * @since 3.8.1 Added `$user_id` parameter.
+	 *
+	 * @param int $user_id The user ID.
+	 */
+	do_action( 'admin_color_scheme_picker', $user_id );
+?></td>
 </tr>
 <?php
 endif; // $_wp_admin_css_colors
diff --git a/src/wp-admin/user-new.php b/src/wp-admin/user-new.php
index 61343735e7..02f17f8498 100644
--- a/src/wp-admin/user-new.php
+++ b/src/wp-admin/user-new.php
@@ -280,14 +280,14 @@ if ( is_multisite() ) {
 		$type  = 'text';
 	}
 ?>
-<?php
-/**
- * Fires inside the adduser form tag.
- *
- * @since 3.0.0
- */
-?>
-<form action="" method="post" name="adduser" id="adduser" class="validate" novalidate="novalidate"<?php do_action( 'user_new_form_tag' );?>>
+<form action="" method="post" name="adduser" id="adduser" class="validate" novalidate="novalidate"<?php
+	/**
+	 * Fires inside the adduser form tag.
+	 *
+	 * @since 3.0.0
+	 */
+	do_action( 'user_new_form_tag' );
+?>>
 <input name="action" type="hidden" value="adduser" />
 <?php wp_nonce_field( 'add-user', '_wpnonce_add-user' ) ?>
 
@@ -334,8 +334,10 @@ if ( current_user_can( 'create_users') ) {
 		echo '<h3 id="create-new-user">' . __( 'Add New User' ) . '</h3>';
 ?>
 <p><?php _e('Create a brand new user and add them to this site.'); ?></p>
-<?php /** This action is documented in wp-admin/user-new.php */ ?>
-<form action="" method="post" name="createuser" id="createuser" class="validate" novalidate="novalidate"<?php do_action( 'user_new_form_tag' );?>>
+<form action="" method="post" name="createuser" id="createuser" class="validate" novalidate="novalidate"<?php
+	/** This action is documented in wp-admin/user-new.php */
+	do_action( 'user_new_form_tag' );
+?>>
 <input name="action" type="hidden" value="createuser" />
 <?php wp_nonce_field( 'create-user', '_wpnonce_create-user' ); ?>
 <?php
diff --git a/src/wp-includes/feed-rdf.php b/src/wp-includes/feed-rdf.php
index 177ae96f6a..1e8327b0dc 100644
--- a/src/wp-includes/feed-rdf.php
+++ b/src/wp-includes/feed-rdf.php
@@ -34,10 +34,14 @@ do_action( 'rss_tag_pre', 'rdf' );
 	<link><?php bloginfo_rss('url') ?></link>
 	<description><?php bloginfo_rss('description') ?></description>
 	<dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date>
-	<?php /** This filter is documented in wp-includes/feed-rss2.php */ ?>
-	<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
-	<?php /** This filter is documented in wp-includes/feed-rss2.php */ ?>
-	<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
+	<sy:updatePeriod><?php
+		/** This filter is documented in wp-includes/feed-rss2.php */
+		echo apply_filters( 'rss_update_period', 'hourly' );
+	?></sy:updatePeriod>
+	<sy:updateFrequency><?php
+		/** This filter is documented in wp-includes/feed-rss2.php */
+		echo apply_filters( 'rss_update_frequency', '1' );
+	?></sy:updateFrequency>
 	<sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase>
 	<?php
 	/**
diff --git a/src/wp-includes/feed-rss2-comments.php b/src/wp-includes/feed-rss2-comments.php
index 2a71da1f2c..703fa87cfa 100644
--- a/src/wp-includes/feed-rss2-comments.php
+++ b/src/wp-includes/feed-rss2-comments.php
@@ -44,10 +44,14 @@ do_action( 'rss_tag_pre', 'rss2-comments' );
 	<link><?php (is_single()) ? the_permalink_rss() : bloginfo_rss("url") ?></link>
 	<description><?php bloginfo_rss("description") ?></description>
 	<lastBuildDate><?php echo mysql2date('r', get_lastcommentmodified('GMT')); ?></lastBuildDate>
-	<?php /** This filter is documented in wp-includes/feed-rss2.php */ ?>
-	<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
-	<?php /** This filter is documented in wp-includes/feed-rss2.php */ ?>
-	<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
+	<sy:updatePeriod><?php
+		/** This filter is documented in wp-includes/feed-rss2.php */
+		echo apply_filters( 'rss_update_period', 'hourly' );
+	?></sy:updatePeriod>
+	<sy:updateFrequency><?php
+		/** This filter is documented in wp-includes/feed-rss2.php */
+		echo apply_filters( 'rss_update_frequency', '1' );
+	?></sy:updateFrequency>
 	<?php
 	/**
 	 * Fires at the end of the RSS2 comment feed header.
diff --git a/src/wp-includes/feed-rss2.php b/src/wp-includes/feed-rss2.php
index 3c91e74f49..2390c2d957 100644
--- a/src/wp-includes/feed-rss2.php
+++ b/src/wp-includes/feed-rss2.php
@@ -44,30 +44,32 @@ do_action( 'rss_tag_pre', 'rss2' );
 	<description><?php bloginfo_rss("description") ?></description>
 	<lastBuildDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></lastBuildDate>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
-	<?php
-	$duration = 'hourly';
-	/**
-	 * Filter how often to update the RSS feed.
-	 *
-	 * @since 2.1.0
-	 *
-	 * @param string $duration The update period.
-	 *                         Default 'hourly'. Accepts 'hourly', 'daily', 'weekly', 'monthly', 'yearly'.
-	 */
-	?>
-	<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', $duration ); ?></sy:updatePeriod>
-	<?php
-	$frequency = '1';
-	/**
-	 * Filter the RSS update frequency.
-	 *
-	 * @since 2.1.0
-	 *
-	 * @param string $frequency An integer passed as a string representing the frequency
-	 *                          of RSS updates within the update period. Default '1'.
-	 */
-	?>
-	<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', $frequency ); ?></sy:updateFrequency>
+	<sy:updatePeriod><?php
+		$duration = 'hourly';
+
+		/**
+		 * Filter how often to update the RSS feed.
+		 *
+		 * @since 2.1.0
+		 *
+		 * @param string $duration The update period. Accepts 'hourly', 'daily', 'weekly', 'monthly',
+		 *                         'yearly'. Default 'hourly'.
+		 */
+		echo apply_filters( 'rss_update_period', $duration );
+	?></sy:updatePeriod>
+	<sy:updateFrequency><?php
+		$frequency = '1';
+
+		/**
+		 * Filter the RSS update frequency.
+		 *
+		 * @since 2.1.0
+		 *
+		 * @param string $frequency An integer passed as a string representing the frequency
+		 *                          of RSS updates within the update period. Default '1'.
+		 */
+		echo apply_filters( 'rss_update_frequency', $frequency );
+	?></sy:updateFrequency>
 	<?php
 	/**
 	 * Fires at the end of the RSS2 Feed Header.
diff --git a/src/wp-includes/theme-compat/comments-popup.php b/src/wp-includes/theme-compat/comments-popup.php
index 15751fe1b0..e8f8655eb3 100644
--- a/src/wp-includes/theme-compat/comments-popup.php
+++ b/src/wp-includes/theme-compat/comments-popup.php
@@ -96,7 +96,10 @@ if ( post_password_required($post) ) {  // and it doesn't match the cookie
 	  <input type="hidden" name="redirect_to" value="<?php echo esc_attr($_SERVER["REQUEST_URI"]); ?>" />
 	  <input name="submit" type="submit" tabindex="5" value="<?php esc_attr_e('Say It!' ); ?>" />
 	</p>
-	<?php do_action('comment_form', $post->ID); ?>
+	<?php
+	/** This filter is documented in wp-includes/comment-template.php */
+	do_action( 'comment_form', $post->ID );
+	?>
 </form>
 <?php } else { // comments are closed ?>
 <p><?php _e('Sorry, the comment form is closed at this time.'); ?></p>
diff --git a/src/wp-includes/theme-compat/comments.php b/src/wp-includes/theme-compat/comments.php
index a1ae2c66e1..1016f4f5a9 100644
--- a/src/wp-includes/theme-compat/comments.php
+++ b/src/wp-includes/theme-compat/comments.php
@@ -91,7 +91,10 @@ _deprecated_file( sprintf( __( 'Theme without %1$s' ), basename(__FILE__) ), '3.
 <p><input name="submit" type="submit" id="submit" tabindex="5" value="<?php esc_attr_e('Submit Comment'); ?>" />
 <?php comment_id_fields(); ?>
 </p>
-<?php do_action('comment_form', $post->ID); ?>
+<?php
+/** This filter is documented in wp-includes/comment-template.php */
+do_action( 'comment_form', $post->ID );
+?>
 
 </form>
 
