<?php

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/**

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* WP_Theme Class

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*

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* @package WordPress

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* @subpackage Theme

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* @since 3.4.0

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*/

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final class WP_Theme implements ArrayAccess {

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/**

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* Whether the theme has been marked as updateable.

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*

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* @since 4.4.0

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* @var bool

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*

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* @see WP_MS_Themes_List_Table

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*/

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public $update = false;

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/**

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* Headers for style.css files.

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*

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* @since 3.4.0

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* @since 5.4.0 Added `Requires at least` and `Requires PHP` headers.

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* @var array

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*/

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private static $file_headers = array(

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'Name' => 'Theme Name',

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'ThemeURI' => 'Theme URI',

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'Description' => 'Description',

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'Author' => 'Author',

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'AuthorURI' => 'Author URI',

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'Version' => 'Version',

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'Template' => 'Template',

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'Status' => 'Status',

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'Tags' => 'Tags',

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'TextDomain' => 'Text Domain',

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'DomainPath' => 'Domain Path',

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'RequiresWP' => 'Requires at least',

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'RequiresPHP' => 'Requires PHP',

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);

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/**

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* Default themes.

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*

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* @var array

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*/

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private static $default_themes = array(

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'classic' => 'WordPress Classic',

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'default' => 'WordPress Default',

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'twentyten' => 'Twenty Ten',

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'twentyeleven' => 'Twenty Eleven',

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'twentytwelve' => 'Twenty Twelve',

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'twentythirteen' => 'Twenty Thirteen',

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'twentyfourteen' => 'Twenty Fourteen',

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'twentyfifteen' => 'Twenty Fifteen',

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'twentysixteen' => 'Twenty Sixteen',

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'twentyseventeen' => 'Twenty Seventeen',

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'twentynineteen' => 'Twenty Nineteen',

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'twentytwenty' => 'Twenty Twenty',

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'twentytwentyone' => 'Twenty Twenty-One',

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);

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/**

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* Renamed theme tags.

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*

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* @var array

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*/

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private static $tag_map = array(

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'fixed-width' => 'fixed-layout',

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'flexible-width' => 'fluid-layout',

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);

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/**

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* Absolute path to the theme root, usually wp-content/themes

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*

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* @var string

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*/

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private $theme_root;

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/**

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* Header data from the theme's style.css file.

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*

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* @var array

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*/

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private $headers = array();

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/**

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* Header data from the theme's style.css file after being sanitized.

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*

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* @var array

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*/

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private $headers_sanitized;

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/**

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* Header name from the theme's style.css after being translated.

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*

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* Cached due to sorting functions running over the translated name.

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*

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* @var string

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*/

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private $name_translated;

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/**

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* Errors encountered when initializing the theme.

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*

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* @var WP_Error

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*/

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private $errors;

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/**

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* The directory name of the theme's files, inside the theme root.

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*

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* In the case of a child theme, this is directory name of the child theme.

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* Otherwise, 'stylesheet' is the same as 'template'.

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*

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* @var string

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*/

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private $stylesheet;

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/**

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* The directory name of the theme's files, inside the theme root.

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*

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* In the case of a child theme, this is the directory name of the parent theme.

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* Otherwise, 'template' is the same as 'stylesheet'.

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*

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* @var string

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*/

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private $template;

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/**

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* A reference to the parent theme, in the case of a child theme.

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*

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* @var WP_Theme

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*/

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private $parent;

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/**

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* URL to the theme root, usually an absolute URL to wp-content/themes

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*

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* @var string

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*/

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private $theme_root_uri;

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/**

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* Flag for whether the theme's textdomain is loaded.

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*

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* @var bool

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*/

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private $textdomain_loaded;

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/**

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* Stores an md5 hash of the theme root, to function as the cache key.

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*

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* @var string

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*/

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private $cache_hash;

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/**

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* Flag for whether the themes cache bucket should be persistently cached.

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*

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* Default is false. Can be set with the {@see 'wp_cache_themes_persistently'} filter.

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*

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* @var bool

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*/

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private static $persistently_cache;

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/**

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* Expiration time for the themes cache bucket.

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*

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* By default the bucket is not cached, so this value is useless.

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*

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* @var bool

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*/

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private static $cache_expiration = 1800;

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/**

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* Constructor for WP_Theme.

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*

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* @since 3.4.0

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*

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* @global array $wp_theme_directories

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*

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* @param string $theme_dir Directory of the theme within the theme_root.

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* @param string $theme_root Theme root.

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* @param WP_Theme|null $_child If this theme is a parent theme, the child may be passed for validation purposes.

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*/

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public function __construct( $theme_dir, $theme_root, $_child = null ) {

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global $wp_theme_directories;

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// Initialize caching on first run.

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if ( ! isset( self::$persistently_cache ) ) {

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/** This action is documented in wp-includes/theme.php */

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self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' );

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if ( self::$persistently_cache ) {

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wp_cache_add_global_groups( 'themes' );

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if ( is_int( self::$persistently_cache ) ) {

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self::$cache_expiration = self::$persistently_cache;

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}

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} else {

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wp_cache_add_non_persistent_groups( 'themes' );

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}

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}

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$this->theme_root = $theme_root;

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$this->stylesheet = $theme_dir;

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// Correct a situation where the theme is 'some-directory/some-theme' but 'some-directory' was passed in as part of the theme root instead.

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if ( ! in_array( $theme_root, (array) $wp_theme_directories, true )

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&& in_array( dirname( $theme_root ), (array) $wp_theme_directories, true )

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) {

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$this->stylesheet = basename( $this->theme_root ) . '/' . $this->stylesheet;

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$this->theme_root = dirname( $theme_root );

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}

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$this->cache_hash = md5( $this->theme_root . '/' . $this->stylesheet );

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$theme_file = $this->stylesheet . '/style.css';

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$cache = $this->cache_get( 'theme' );

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if ( is_array( $cache ) ) {

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foreach ( array( 'errors', 'headers', 'template' ) as $key ) {

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if ( isset( $cache[ $key ] ) ) {

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$this->$key = $cache[ $key ];

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}

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}

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if ( $this->errors ) {

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return;

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}

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if ( isset( $cache['theme_root_template'] ) ) {

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$theme_root_template = $cache['theme_root_template'];

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}

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} elseif ( ! file_exists( $this->theme_root . '/' . $theme_file ) ) {

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$this->headers['Name'] = $this->stylesheet;

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if ( ! file_exists( $this->theme_root . '/' . $this->stylesheet ) ) {

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$this->errors = new WP_Error(

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'theme_not_found',

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sprintf(

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/* translators: %s: Theme directory name. */

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__( 'The theme directory "%s" does not exist.' ),

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esc_html( $this->stylesheet )

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)

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);

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} else {

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$this->errors = new WP_Error( 'theme_no_stylesheet', __( 'Stylesheet is missing.' ) );

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}

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$this->template = $this->stylesheet;

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$this->cache_add(

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'theme',

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array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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'template' => $this->template,

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)

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);

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if ( ! file_exists( $this->theme_root ) ) { // Don't cache this one.

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$this->errors->add( 'theme_root_missing', __( 'Error: The themes directory is either empty or doesn&#8217;t exist. Please check your installation.' ) );

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}

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return;

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} elseif ( ! is_readable( $this->theme_root . '/' . $theme_file ) ) {

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$this->headers['Name'] = $this->stylesheet;

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$this->errors = new WP_Error( 'theme_stylesheet_not_readable', __( 'Stylesheet is not readable.' ) );

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$this->template = $this->stylesheet;

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$this->cache_add(

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'theme',

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array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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'template' => $this->template,

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)

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);

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return;

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} else {

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$this->headers = get_file_data( $this->theme_root . '/' . $theme_file, self::$file_headers, 'theme' );

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// Default themes always trump their pretenders.

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// Properly identify default themes that are inside a directory within wp-content/themes.

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$default_theme_slug = array_search( $this->headers['Name'], self::$default_themes, true );

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if ( $default_theme_slug ) {

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if ( basename( $this->stylesheet ) != $default_theme_slug ) {

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$this->headers['Name'] .= '/' . $this->stylesheet;

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}

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}

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}

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if ( ! $this->template && $this->stylesheet === $this->headers['Template'] ) {

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$this->errors = new WP_Error(

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'theme_child_invalid',

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sprintf(

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/* translators: %s: Template. */

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__( 'The theme defines itself as its parent theme. Please check the %s header.' ),

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'<code>Template</code>'

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)

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);

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$this->cache_add(

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'theme',

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array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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)

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);

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return;

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}

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// (If template is set from cache [and there are no errors], we know it's good.)

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if ( ! $this->template ) {

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$this->template = $this->headers['Template'];

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}

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if ( ! $this->template ) {

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$this->template = $this->stylesheet;

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if ( ! file_exists( $this->theme_root . '/' . $this->stylesheet . '/index.php' ) ) {

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$error_message = sprintf(

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/* translators: 1: index.php, 2: Documentation URL, 3: style.css */

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__( '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.' ),

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'<code>index.php</code>',

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__( 'https://developer.wordpress.org/themes/advanced-topics/child-themes/' ),

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'<code>style.css</code>'

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);

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$this->errors = new WP_Error( 'theme_no_index', $error_message );

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$this->cache_add(

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'theme',

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array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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'template' => $this->template,

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)

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);

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return;

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}

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}

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// If we got our data from cache, we can assume that 'template' is pointing to the right place.

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if ( ! is_array( $cache ) && $this->template != $this->stylesheet && ! file_exists( $this->theme_root . '/' . $this->template . '/index.php' ) ) {

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// If we're in a directory of themes inside /themes, look for the parent nearby.

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// wp-content/themes/directory-of-themes/*

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$parent_dir = dirname( $this->stylesheet );

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$directories = search_theme_directories();

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if ( '.' !== $parent_dir && file_exists( $this->theme_root . '/' . $parent_dir . '/' . $this->template . '/index.php' ) ) {

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$this->template = $parent_dir . '/' . $this->template;

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} elseif ( $directories && isset( $directories[ $this->template ] ) ) {

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// Look for the template in the search_theme_directories() results, in case it is in another theme root.

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// We don't look into directories of themes, just the theme root.

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$theme_root_template = $directories[ $this->template ]['theme_root'];

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} else {

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// Parent theme is missing.

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$this->errors = new WP_Error(

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'theme_no_parent',

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sprintf(

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/* translators: %s: Theme directory name. */

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__( 'The parent theme is missing. Please install the "%s" parent theme.' ),

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esc_html( $this->template )

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)

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);

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$this->cache_add(

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'theme',

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array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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'template' => $this->template,

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)

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);

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$this->parent = new WP_Theme( $this->template, $this->theme_root, $this );

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return;

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}

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}

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// Set the parent, if we're a child theme.

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if ( $this->template != $this->stylesheet ) {

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// If we are a parent, then there is a problem. Only two generations allowed! Cancel things out.

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if ( $_child instanceof WP_Theme && $_child->template == $this->stylesheet ) {

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$_child->parent = null;

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$_child->errors = new WP_Error(

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'theme_parent_invalid',

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sprintf(

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/* translators: %s: Theme directory name. */

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__( 'The "%s" theme is not a valid parent theme.' ),

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esc_html( $_child->template )

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)

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);

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$_child->cache_add(

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'theme',

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array(

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'headers' => $_child->headers,

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'errors' => $_child->errors,

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'stylesheet' => $_child->stylesheet,

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'template' => $_child->template,

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)

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);

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// The two themes actually reference each other with the Template header.

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if ( $_child->stylesheet == $this->template ) {

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$this->errors = new WP_Error(

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'theme_parent_invalid',

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sprintf(

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/* translators: %s: Theme directory name. */

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__( 'The "%s" theme is not a valid parent theme.' ),

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esc_html( $this->template )

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)

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);

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$this->cache_add(

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'theme',

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array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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'template' => $this->template,

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)

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);

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}

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return;

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}

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// Set the parent. Pass the current instance so we can do the crazy checks above and assess errors.

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$this->parent = new WP_Theme( $this->template, isset( $theme_root_template ) ? $theme_root_template : $this->theme_root, $this );

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}

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if ( wp_paused_themes()->get( $this->stylesheet ) && ( ! is_wp_error( $this->errors ) || ! isset( $this->errors->errors['theme_paused'] ) ) ) {

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$this->errors = new WP_Error( 'theme_paused', __( 'This theme failed to load properly and was paused within the admin backend.' ) );

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}

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// We're good. If we didn't retrieve from cache, set it.

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if ( ! is_array( $cache ) ) {

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$cache = array(

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'headers' => $this->headers,

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'errors' => $this->errors,

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'stylesheet' => $this->stylesheet,

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'template' => $this->template,

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);

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// If the parent theme is in another root, we'll want to cache this. Avoids an entire branch of filesystem calls above.

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if ( isset( $theme_root_template ) ) {

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$cache['theme_root_template'] = $theme_root_template;

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}

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$this->cache_add( 'theme', $cache );

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}

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}

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[441] Fix | Delete

/**

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* When converting the object to a string, the theme name is returned.

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*

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* @since 3.4.0

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*

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* @return string Theme name, ready for display (translated)

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*/

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public function __toString() {

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return (string) $this->display( 'Name' );

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}

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[452] Fix | Delete

/**

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* __isset() magic method for properties formerly returned by current_theme_info()

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*

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* @since 3.4.0

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*

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* @param string $offset Property to check if set.

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* @return bool Whether the given property is set.

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*/

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public function __isset( $offset ) {

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static $properties = array(

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'name',

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'title',

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'version',

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'parent_theme',

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'template_dir',

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'stylesheet_dir',

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'template',

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'stylesheet',

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'screenshot',

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'description',

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'author',

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'tags',

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'theme_root',

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'theme_root_uri',

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);

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return in_array( $offset, $properties, true );

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}

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[481] Fix | Delete

/**

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* __get() magic method for properties formerly returned by current_theme_info()

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*

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* @since 3.4.0

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*

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* @param string $offset Property to get.

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* @return mixed Property value.

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*/

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public function __get( $offset ) {

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switch ( $offset ) {

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case 'name':

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case 'title':

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return $this->get( 'Name' );

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case 'version':

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return $this->get( 'Version' );

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case 'parent_theme':

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return $this->parent() ? $this->parent()->get( 'Name' ) : '';

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case 'template_dir':

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