wp/wp-includes/class-wp-theme.php
changeset 16 a86126ab1dd4
parent 9 177826044cd9
child 18 be944660c56a
--- a/wp/wp-includes/class-wp-theme.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/class-wp-theme.php	Tue Dec 15 13:49:49 2020 +0100
@@ -21,6 +21,8 @@
 	/**
 	 * Headers for style.css files.
 	 *
+	 * @since 3.4.0
+	 * @since 5.4.0 Added `Requires at least` and `Requires PHP` headers.
 	 * @var array
 	 */
 	private static $file_headers = array(
@@ -35,6 +37,8 @@
 		'Tags'        => 'Tags',
 		'TextDomain'  => 'Text Domain',
 		'DomainPath'  => 'Domain Path',
+		'RequiresWP'  => 'Requires at least',
+		'RequiresPHP' => 'Requires PHP',
 	);
 
 	/**
@@ -54,6 +58,7 @@
 		'twentysixteen'   => 'Twenty Sixteen',
 		'twentyseventeen' => 'Twenty Seventeen',
 		'twentynineteen'  => 'Twenty Nineteen',
+		'twentytwenty'    => 'Twenty Twenty',
 	);
 
 	/**
@@ -172,13 +177,13 @@
 	/**
 	 * Constructor for WP_Theme.
 	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @global array $wp_theme_directories
 	 *
-	 * @param string $theme_dir Directory of the theme within the theme_root.
-	 * @param string $theme_root Theme root.
-	 * @param WP_Error|void $_child If this theme is a parent theme, the child may be passed for validation purposes.
+	 * @param string        $theme_dir  Directory of the theme within the theme_root.
+	 * @param string        $theme_root Theme root.
+	 * @param WP_Theme|null $_child If this theme is a parent theme, the child may be passed for validation purposes.
 	 */
 	public function __construct( $theme_dir, $theme_root, $_child = null ) {
 		global $wp_theme_directories;
@@ -201,7 +206,9 @@
 		$this->stylesheet = $theme_dir;
 
 		// Correct a situation where the theme is 'some-directory/some-theme' but 'some-directory' was passed in as part of the theme root instead.
-		if ( ! in_array( $theme_root, (array) $wp_theme_directories ) && in_array( dirname( $theme_root ), (array) $wp_theme_directories ) ) {
+		if ( ! in_array( $theme_root, (array) $wp_theme_directories, true )
+			&& in_array( dirname( $theme_root ), (array) $wp_theme_directories, true )
+		) {
 			$this->stylesheet = basename( $this->theme_root ) . '/' . $this->stylesheet;
 			$this->theme_root = dirname( $theme_root );
 		}
@@ -226,7 +233,14 @@
 		} elseif ( ! file_exists( $this->theme_root . '/' . $theme_file ) ) {
 			$this->headers['Name'] = $this->stylesheet;
 			if ( ! file_exists( $this->theme_root . '/' . $this->stylesheet ) ) {
-				$this->errors = new WP_Error( 'theme_not_found', sprintf( __( 'The theme directory "%s" does not exist.' ), esc_html( $this->stylesheet ) ) );
+				$this->errors = new WP_Error(
+					'theme_not_found',
+					sprintf(
+						/* translators: %s: Theme directory name. */
+						__( 'The theme directory "%s" does not exist.' ),
+						esc_html( $this->stylesheet )
+					)
+				);
 			} else {
 				$this->errors = new WP_Error( 'theme_no_stylesheet', __( 'Stylesheet is missing.' ) );
 			}
@@ -241,7 +255,7 @@
 				)
 			);
 			if ( ! file_exists( $this->theme_root ) ) { // Don't cache this one.
-				$this->errors->add( 'theme_root_missing', __( 'ERROR: The themes directory is either empty or doesn’t exist. Please check your installation.' ) );
+				$this->errors->add( 'theme_root_missing', __( 'Error: The themes directory is either empty or doesn’t exist. Please check your installation.' ) );
 			}
 			return;
 		} elseif ( ! is_readable( $this->theme_root . '/' . $theme_file ) ) {
@@ -262,7 +276,8 @@
 			$this->headers = get_file_data( $this->theme_root . '/' . $theme_file, self::$file_headers, 'theme' );
 			// Default themes always trump their pretenders.
 			// Properly identify default themes that are inside a directory within wp-content/themes.
-			if ( $default_theme_slug = array_search( $this->headers['Name'], self::$default_themes ) ) {
+			$default_theme_slug = array_search( $this->headers['Name'], self::$default_themes, true );
+			if ( $default_theme_slug ) {
 				if ( basename( $this->stylesheet ) != $default_theme_slug ) {
 					$this->headers['Name'] .= '/' . $this->stylesheet;
 				}
@@ -270,8 +285,14 @@
 		}
 
 		if ( ! $this->template && $this->stylesheet === $this->headers['Template'] ) {
-			/* translators: %s: Template */
-			$this->errors = new WP_Error( 'theme_child_invalid', sprintf( __( 'The theme defines itself as its parent theme. Please check the %s header.' ), '<code>Template</code>' ) );
+			$this->errors = new WP_Error(
+				'theme_child_invalid',
+				sprintf(
+					/* translators: %s: Template. */
+					__( 'The theme defines itself as its parent theme. Please check the %s header.' ),
+					'<code>Template</code>'
+				)
+			);
 			$this->cache_add(
 				'theme',
 				array(
@@ -285,11 +306,15 @@
 		}
 
 		// (If template is set from cache [and there are no errors], we know it's good.)
-		if ( ! $this->template && ! ( $this->template = $this->headers['Template'] ) ) {
+		if ( ! $this->template ) {
+			$this->template = $this->headers['Template'];
+		}
+
+		if ( ! $this->template ) {
 			$this->template = $this->stylesheet;
 			if ( ! file_exists( $this->theme_root . '/' . $this->stylesheet . '/index.php' ) ) {
 				$error_message = sprintf(
-					/* translators: 1: index.php, 2: link to documentation, 3: style.css */
+					/* translators: 1: index.php, 2: Documentation URL, 3: style.css */
 					__( 'Template is missing. Standalone themes need to have a %1$s template file. <a href="%2$s">Child themes</a> need to have a Template header in the %3$s stylesheet.' ),
 					'<code>index.php</code>',
 					__( 'https://developer.wordpress.org/themes/advanced-topics/child-themes/' ),
@@ -313,16 +338,25 @@
 		if ( ! is_array( $cache ) && $this->template != $this->stylesheet && ! file_exists( $this->theme_root . '/' . $this->template . '/index.php' ) ) {
 			// If we're in a directory of themes inside /themes, look for the parent nearby.
 			// wp-content/themes/directory-of-themes/*
-			$parent_dir = dirname( $this->stylesheet );
-			if ( '.' != $parent_dir && file_exists( $this->theme_root . '/' . $parent_dir . '/' . $this->template . '/index.php' ) ) {
+			$parent_dir  = dirname( $this->stylesheet );
+			$directories = search_theme_directories();
+
+			if ( '.' !== $parent_dir && file_exists( $this->theme_root . '/' . $parent_dir . '/' . $this->template . '/index.php' ) ) {
 				$this->template = $parent_dir . '/' . $this->template;
-			} elseif ( ( $directories = search_theme_directories() ) && isset( $directories[ $this->template ] ) ) {
+			} elseif ( $directories && isset( $directories[ $this->template ] ) ) {
 				// Look for the template in the search_theme_directories() results, in case it is in another theme root.
 				// We don't look into directories of themes, just the theme root.
 				$theme_root_template = $directories[ $this->template ]['theme_root'];
 			} else {
 				// Parent theme is missing.
-				$this->errors = new WP_Error( 'theme_no_parent', sprintf( __( 'The parent theme is missing. Please install the "%s" parent theme.' ), esc_html( $this->template ) ) );
+				$this->errors = new WP_Error(
+					'theme_no_parent',
+					sprintf(
+						/* translators: %s: Theme directory name. */
+						__( 'The parent theme is missing. Please install the "%s" parent theme.' ),
+						esc_html( $this->template )
+					)
+				);
 				$this->cache_add(
 					'theme',
 					array(
@@ -342,7 +376,14 @@
 			// If we are a parent, then there is a problem. Only two generations allowed! Cancel things out.
 			if ( $_child instanceof WP_Theme && $_child->template == $this->stylesheet ) {
 				$_child->parent = null;
-				$_child->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), esc_html( $_child->template ) ) );
+				$_child->errors = new WP_Error(
+					'theme_parent_invalid',
+					sprintf(
+						/* translators: %s: Theme directory name. */
+						__( 'The "%s" theme is not a valid parent theme.' ),
+						esc_html( $_child->template )
+					)
+				);
 				$_child->cache_add(
 					'theme',
 					array(
@@ -354,7 +395,14 @@
 				);
 				// The two themes actually reference each other with the Template header.
 				if ( $_child->stylesheet == $this->template ) {
-					$this->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), esc_html( $this->template ) ) );
+					$this->errors = new WP_Error(
+						'theme_parent_invalid',
+						sprintf(
+							/* translators: %s: Theme directory name. */
+							__( 'The "%s" theme is not a valid parent theme.' ),
+							esc_html( $this->template )
+						)
+					);
 					$this->cache_add(
 						'theme',
 						array(
@@ -394,7 +442,7 @@
 	/**
 	 * When converting the object to a string, the theme name is returned.
 	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @return string Theme name, ready for display (translated)
 	 */
@@ -405,9 +453,7 @@
 	/**
 	 * __isset() magic method for properties formerly returned by current_theme_info()
 	 *
-	 * @staticvar array $properties
-	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @param string $offset Property to check if set.
 	 * @return bool Whether the given property is set.
@@ -430,13 +476,13 @@
 			'theme_root_uri',
 		);
 
-		return in_array( $offset, $properties );
+		return in_array( $offset, $properties, true );
 	}
 
 	/**
 	 * __get() magic method for properties formerly returned by current_theme_info()
 	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @param string $offset Property to get.
 	 * @return mixed Property value.
@@ -480,7 +526,7 @@
 	/**
 	 * Method to implement ArrayAccess for keys formerly returned by get_themes()
 	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @param mixed $offset
 	 * @param mixed $value
@@ -490,7 +536,7 @@
 	/**
 	 * Method to implement ArrayAccess for keys formerly returned by get_themes()
 	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @param mixed $offset
 	 */
@@ -499,9 +545,7 @@
 	/**
 	 * Method to implement ArrayAccess for keys formerly returned by get_themes()
 	 *
-	 * @staticvar array $keys
-	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @param mixed $offset
 	 * @return bool
@@ -529,7 +573,7 @@
 			'Parent Theme',
 		);
 
-		return in_array( $offset, $keys );
+		return in_array( $offset, $keys, true );
 	}
 
 	/**
@@ -542,7 +586,7 @@
 	 * and care should be taken to use `$theme::display( 'Name' )` to get a properly
 	 * translated header.
 	 *
-	 * @since  3.4.0
+	 * @since 3.4.0
 	 *
 	 * @param mixed $offset
 	 * @return mixed
@@ -616,7 +660,7 @@
 	 * @return bool Whether the theme exists.
 	 */
 	public function exists() {
-		return ! ( $this->errors() && in_array( 'theme_not_found', $this->errors()->get_error_codes() ) );
+		return ! ( $this->errors() && in_array( 'theme_not_found', $this->errors()->get_error_codes(), true ) );
 	}
 
 	/**
@@ -637,8 +681,8 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $key Type of data to store (theme, screenshot, headers, post_templates)
-	 * @param string $data Data to store
+	 * @param string       $key  Type of data to store (theme, screenshot, headers, post_templates)
+	 * @param array|string $data Data to store
 	 * @return bool Return value from wp_cache_add()
 	 */
 	private function cache_add( $key, $data ) {
@@ -668,8 +712,14 @@
 		foreach ( array( 'theme', 'screenshot', 'headers', 'post_templates' ) as $key ) {
 			wp_cache_delete( $key . '-' . $this->cache_hash, 'themes' );
 		}
-		$this->template = $this->textdomain_loaded = $this->theme_root_uri = $this->parent = $this->errors = $this->headers_sanitized = $this->name_translated = null;
-		$this->headers  = array();
+		$this->template          = null;
+		$this->textdomain_loaded = null;
+		$this->theme_root_uri    = null;
+		$this->parent            = null;
+		$this->errors            = null;
+		$this->headers_sanitized = null;
+		$this->name_translated   = null;
+		$this->headers           = array();
 		$this->__construct( $this->stylesheet, $this->theme_root );
 	}
 
@@ -687,7 +737,7 @@
 	 * @since 3.4.0
 	 *
 	 * @param string $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
-	 * @return string|false String on success, false on failure.
+	 * @return string|array|false String or array (for Tags header) on success, false on failure.
 	 */
 	public function get( $header ) {
 		if ( ! isset( $this->headers[ $header ] ) ) {
@@ -723,10 +773,11 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
-	 * @param bool $markup Optional. Whether to mark up the header. Defaults to true.
-	 * @param bool $translate Optional. Whether to translate the header. Defaults to true.
-	 * @return string|false Processed header, false on failure.
+	 * @param string $header    Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
+	 * @param bool   $markup    Optional. Whether to mark up the header. Defaults to true.
+	 * @param bool   $translate Optional. Whether to translate the header. Defaults to true.
+	 * @return string|array|false Processed header. An array for Tags if `$markup` is false, string otherwise.
+	 *                            False on failure.
 	 */
 	public function display( $header, $markup = true, $translate = true ) {
 		$value = $this->get( $header );
@@ -753,13 +804,12 @@
 	 * Sanitize a theme header.
 	 *
 	 * @since 3.4.0
-	 *
-	 * @staticvar array $header_tags
-	 * @staticvar array $header_tags_with_a
+	 * @since 5.4.0 Added support for `Requires at least` and `Requires PHP` headers.
 	 *
-	 * @param string $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
-	 * @param string $value Value to sanitize.
-	 * @return mixed
+	 * @param string $header Theme header. Accepts 'Name', 'Description', 'Author', 'Version',
+	 *                       'ThemeURI', 'AuthorURI', 'Status', 'Tags', 'RequiresWP', 'RequiresPHP'.
+	 * @param string $value  Value to sanitize.
+	 * @return string|array An array for Tags header, string otherwise.
 	 */
 	private function sanitize_header( $header, $value ) {
 		switch ( $header ) {
@@ -777,7 +827,8 @@
 					'em'      => true,
 					'strong'  => true,
 				);
-				$value              = wp_kses( $value, $header_tags );
+
+				$value = wp_kses( $value, $header_tags );
 				break;
 			case 'Author':
 				// There shouldn't be anchor tags in Author, but some themes like to be challenging.
@@ -793,7 +844,8 @@
 					'em'      => true,
 					'strong'  => true,
 				);
-				$value                     = wp_kses( $value, $header_tags_with_a );
+
+				$value = wp_kses( $value, $header_tags_with_a );
 				break;
 			case 'ThemeURI':
 			case 'AuthorURI':
@@ -803,6 +855,8 @@
 				$value = array_filter( array_map( 'trim', explode( ',', strip_tags( $value ) ) ) );
 				break;
 			case 'Version':
+			case 'RequiresWP':
+			case 'RequiresPHP':
 				$value = strip_tags( $value );
 				break;
 		}
@@ -815,11 +869,9 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @staticvar string $comma
-	 *
-	 * @param string $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
-	 * @param string $value Value to mark up.
-	 * @param string $translate Whether the header has been translated.
+	 * @param string       $header    Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
+	 * @param string|array $value     Value to mark up. An array for Tags header, string otherwise.
+	 * @param string       $translate Whether the header has been translated.
 	 * @return string Value, marked up.
 	 */
 	private function markup_header( $header, $value, $translate ) {
@@ -842,7 +894,7 @@
 			case 'Tags':
 				static $comma = null;
 				if ( ! isset( $comma ) ) {
-					/* translators: used between list items, there is a space after the comma */
+					/* translators: Used between list items, there is a space after the comma. */
 					$comma = __( ', ' );
 				}
 				$value = implode( $comma, $value );
@@ -861,11 +913,9 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @staticvar array $tags_list
-	 *
-	 * @param string $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
-	 * @param string $value Value to translate.
-	 * @return string Translated value.
+	 * @param string       $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
+	 * @param string|array $value  Value to translate. An array for Tags header, string otherwise.
+	 * @return string|array Translated value. An array for Tags header, string otherwise.
 	 */
 	private function translate_header( $header, $value ) {
 		switch ( $header ) {
@@ -874,8 +924,10 @@
 				if ( isset( $this->name_translated ) ) {
 					return $this->name_translated;
 				}
+
 				// phpcs:ignore WordPress.WP.I18n.LowLevelTranslationFunction,WordPress.WP.I18n.NonSingularStringLiteralText,WordPress.WP.I18n.NonSingularStringLiteralDomain
 				$this->name_translated = translate( $value, $this->get( 'TextDomain' ) );
+
 				return $this->name_translated;
 			case 'Tags':
 				if ( empty( $value ) || ! function_exists( 'get_theme_feature_list' ) ) {
@@ -909,7 +961,8 @@
 						'seasonal'          => __( 'Seasonal' ),
 					);
 
-					$feature_list = get_theme_feature_list( false ); // No API
+					$feature_list = get_theme_feature_list( false ); // No API.
+
 					foreach ( $feature_list as $tags ) {
 						$tags_list += $tags;
 					}
@@ -971,7 +1024,7 @@
 	 * @return string Absolute path of the stylesheet directory.
 	 */
 	public function get_stylesheet_directory() {
-		if ( $this->errors() && in_array( 'theme_root_missing', $this->errors()->get_error_codes() ) ) {
+		if ( $this->errors() && in_array( 'theme_root_missing', $this->errors()->get_error_codes(), true ) ) {
 			return '';
 		}
 
@@ -1079,7 +1132,7 @@
 	public function get_screenshot( $uri = 'uri' ) {
 		$screenshot = $this->cache_get( 'screenshot' );
 		if ( $screenshot ) {
-			if ( 'relative' == $uri ) {
+			if ( 'relative' === $uri ) {
 				return $screenshot;
 			}
 			return $this->get_stylesheet_directory_uri() . '/' . $screenshot;
@@ -1090,7 +1143,7 @@
 		foreach ( array( 'png', 'gif', 'jpg', 'jpeg' ) as $ext ) {
 			if ( file_exists( $this->get_stylesheet_directory() . "/screenshot.$ext" ) ) {
 				$this->cache_add( 'screenshot', 'screenshot.' . $ext );
-				if ( 'relative' == $uri ) {
+				if ( 'relative' === $uri ) {
 					return 'screenshot.' . $ext;
 				}
 				return $this->get_stylesheet_directory_uri() . '/' . 'screenshot.' . $ext;
@@ -1106,11 +1159,13 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param mixed $type Optional. Array of extensions to return. Defaults to all files (null).
-	 * @param int $depth Optional. How deep to search for files. Defaults to a flat scan (0 depth). -1 depth is infinite.
-	 * @param bool $search_parent Optional. Whether to return parent files. Defaults to false.
-	 * @return array Array of files, keyed by the path to the file relative to the theme's directory, with the values
-	 *               being absolute paths.
+	 * @param string[]|string $type          Optional. Array of extensions to find, string of a single extension,
+	 *                                       or null for all extensions. Default null.
+	 * @param int             $depth         Optional. How deep to search for files. Defaults to a flat scan (0 depth).
+	 *                                       -1 depth is infinite.
+	 * @param bool            $search_parent Optional. Whether to return parent files. Default false.
+	 * @return string[] Array of files, keyed by the path to the file relative to the theme's directory, with the values
+	 *                  being absolute paths.
 	 */
 	public function get_files( $type = null, $depth = 0, $search_parent = false ) {
 		$files = (array) self::scandir( $this->get_stylesheet_directory(), $type, $depth );
@@ -1127,8 +1182,8 @@
 	 *
 	 * @since 4.7.0
 	 *
-	 * @return array Array of page templates, keyed by filename and post type,
-	 *               with the value of the translated header name.
+	 * @return string[] Array of page templates, keyed by filename and post type,
+	 *                  with the value of the translated header name.
 	 */
 	public function get_post_templates() {
 		// If you screw up your current theme and we invalidate your parent, most things still work. Let it slide.
@@ -1186,7 +1241,7 @@
 	 * @param WP_Post|null $post      Optional. The post being edited, provided for context.
 	 * @param string       $post_type Optional. Post type to get the templates for. Default 'page'.
 	 *                                If a post is provided, its post type is used.
-	 * @return array Array of page templates, keyed by filename, with the value of the translated header name.
+	 * @return string[] Array of template header names keyed by the template file name.
 	 */
 	public function get_page_templates( $post = null, $post_type = 'page' ) {
 		if ( $post ) {
@@ -1201,8 +1256,7 @@
 		 *
 		 * @since 4.9.6
 		 *
-		 * @param string[]     $post_templates Array of page templates. Keys are filenames,
-		 *                                     values are translated names.
+		 * @param string[]     $post_templates Array of template header names keyed by the template file name.
 		 * @param WP_Theme     $this           The theme object.
 		 * @param WP_Post|null $post           The post being edited, provided for context, or null.
 		 * @param string       $post_type      Post type to get the templates for.
@@ -1218,8 +1272,7 @@
 		 * @since 4.4.0 Converted to allow complete control over the `$page_templates` array.
 		 * @since 4.7.0 Added the `$post_type` parameter.
 		 *
-		 * @param string[]     $post_templates Array of page templates. Keys are filenames,
-		 *                                     values are translated names.
+		 * @param string[]     $post_templates Array of template header names keyed by the template file name.
 		 * @param WP_Theme     $this           The theme object.
 		 * @param WP_Post|null $post           The post being edited, provided for context, or null.
 		 * @param string       $post_type      Post type to get the templates for.
@@ -1242,8 +1295,8 @@
 	 * @param string            $relative_path Optional. The basename of the absolute path. Used to control the
 	 *                                         returned path for the found files, particularly when this function
 	 *                                         recurses to lower depths. Default empty.
-	 * @return array|false Array of files, keyed by the path to the file relative to the `$path` directory prepended
-	 *                     with `$relative_path`, with the values being absolute paths. False otherwise.
+	 * @return string[]|false Array of files, keyed by the path to the file relative to the `$path` directory prepended
+	 *                        with `$relative_path`, with the values being absolute paths. False otherwise.
 	 */
 	private static function scandir( $path, $extensions = null, $depth = 0, $relative_path = '' ) {
 		if ( ! is_dir( $path ) ) {
@@ -1256,7 +1309,7 @@
 		}
 
 		$relative_path = trailingslashit( $relative_path );
-		if ( '/' == $relative_path ) {
+		if ( '/' === $relative_path ) {
 			$relative_path = '';
 		}
 
@@ -1273,7 +1326,7 @@
 		$exclusions = (array) apply_filters( 'theme_scandir_exclusions', array( 'CVS', 'node_modules', 'vendor', 'bower_components' ) );
 
 		foreach ( $results as $result ) {
-			if ( '.' == $result[0] || in_array( $result, $exclusions, true ) ) {
+			if ( '.' === $result[0] || in_array( $result, $exclusions, true ) ) {
 				continue;
 			}
 			if ( is_dir( $path . '/' . $result ) ) {
@@ -1293,7 +1346,7 @@
 	/**
 	 * Loads the theme's textdomain.
 	 *
-	 * Translation files are not inherited from the parent theme. Todo: if this fails for the
+	 * Translation files are not inherited from the parent theme. TODO: If this fails for the
 	 * child theme, it should probably try to load the parent theme's translations.
 	 *
 	 * @since 3.4.0
@@ -1317,8 +1370,9 @@
 			return true;
 		}
 
-		$path = $this->get_stylesheet_directory();
-		if ( $domainpath = $this->get( 'DomainPath' ) ) {
+		$path       = $this->get_stylesheet_directory();
+		$domainpath = $this->get( 'DomainPath' );
+		if ( $domainpath ) {
 			$path .= $domainpath;
 		} else {
 			$path .= '/languages';
@@ -1333,9 +1387,9 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $check Optional. Whether to check only the 'network'-wide settings, the 'site'
-	 *  settings, or 'both'. Defaults to 'both'.
-	 * @param int $blog_id Optional. Ignored if only network-wide settings are checked. Defaults to current site.
+	 * @param string $check   Optional. Whether to check only the 'network'-wide settings, the 'site'
+	 *                        settings, or 'both'. Defaults to 'both'.
+	 * @param int    $blog_id Optional. Ignored if only network-wide settings are checked. Defaults to current site.
 	 * @return bool Whether the theme is allowed for the network. Returns true in single-site.
 	 */
 	public function is_allowed( $check = 'both', $blog_id = null ) {
@@ -1343,14 +1397,14 @@
 			return true;
 		}
 
-		if ( 'both' == $check || 'network' == $check ) {
+		if ( 'both' === $check || 'network' === $check ) {
 			$allowed = self::get_allowed_on_network();
 			if ( ! empty( $allowed[ $this->get_stylesheet() ] ) ) {
 				return true;
 			}
 		}
 
-		if ( 'both' == $check || 'site' == $check ) {
+		if ( 'both' === $check || 'site' === $check ) {
 			$allowed = self::get_allowed_on_site( $blog_id );
 			if ( ! empty( $allowed[ $this->get_stylesheet() ] ) ) {
 				return true;
@@ -1365,7 +1419,7 @@
 	 *
 	 * This hits the filesystem.
 	 *
-	 * @since  4.4.0
+	 * @since 4.4.0
 	 *
 	 * @return WP_Theme|false Object, or false if no theme is installed, which would be bad.
 	 */
@@ -1408,8 +1462,6 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @staticvar array $allowed_themes
-	 *
 	 * @return string[] Array of stylesheet names.
 	 */
 	public static function get_allowed_on_network() {
@@ -1435,8 +1487,6 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @staticvar array $allowed_themes
-	 *
 	 * @param int $blog_id Optional. ID of the site. Defaults to the current site.
 	 * @return string[] Array of stylesheet names.
 	 */
@@ -1459,7 +1509,7 @@
 			return (array) apply_filters( 'site_allowed_themes', $allowed_themes[ $blog_id ], $blog_id );
 		}
 
-		$current = $blog_id == get_current_blog_id();
+		$current = get_current_blog_id() == $blog_id;
 
 		if ( $current ) {
 			$allowed_themes[ $blog_id ] = get_option( 'allowedthemes' );
@@ -1586,8 +1636,8 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $a First name.
-	 * @param string $b Second name.
+	 * @param WP_Theme $a First theme.
+	 * @param WP_Theme $b Second theme.
 	 * @return int Negative if `$a` falls lower in the natural order than `$b`. Zero if they fall equally.
 	 *             Greater than 0 if `$a` falls higher in the natural order than `$b`. Used with usort().
 	 */
@@ -1600,8 +1650,8 @@
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $a First name.
-	 * @param string $b Second name.
+	 * @param WP_Theme $a First theme.
+	 * @param WP_Theme $b Second theme.
 	 * @return int Negative if `$a` falls lower in the natural order than `$b`. Zero if they fall equally.
 	 *             Greater than 0 if `$a` falls higher in the natural order than `$b`. Used with usort().
 	 */