<h3>Düzenle: class-theme-upgrader.php</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>&lt;?php
/**
 * Upgrade API: Theme_Upgrader class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Core class used for upgrading/installing themes.
 *
 * It is designed to upgrade/install themes from a local zip, remote zip URL,
 * or uploaded zip file.
 *
 * @since 2.8.0
 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
 *
 * @see WP_Upgrader
 */
class Theme_Upgrader extends WP_Upgrader {

	/**
	 * Result of the theme upgrade offer.
	 *
	 * @since 2.8.0
	 * @var array|WP_Error $result
	 * @see WP_Upgrader::$result
	 */
	public $result;

	/**
	 * Whether multiple themes are being upgraded/installed in bulk.
	 *
	 * @since 2.9.0
	 * @var bool $bulk
	 */
	public $bulk = false;

	/**
	 * New theme info.
	 *
	 * @since 5.5.0
	 * @var array $new_theme_data
	 *
	 * @see check_package()
	 */
	public $new_theme_data = array();

	/**
	 * Initializes the upgrade strings.
	 *
	 * @since 2.8.0
	 */
	public function upgrade_strings() {
		$this-&gt;strings[&#039;up_to_date&#039;] = __( &#039;The theme is at the latest version.&#039; );
		$this-&gt;strings[&#039;no_package&#039;] = __( &#039;Update package not available.&#039; );
		/* translators: %s: Package URL. */
		$this-&gt;strings[&#039;downloading_package&#039;] = sprintf( __( &#039;Downloading update from %s&amp;#8230;&#039; ), &#039;&lt;span class=&quot;code pre&quot;&gt;%s&lt;/span&gt;&#039; );
		$this-&gt;strings[&#039;unpack_package&#039;]      = __( &#039;Unpacking the update&amp;#8230;&#039; );
		$this-&gt;strings[&#039;remove_old&#039;]          = __( &#039;Removing the old version of the theme&amp;#8230;&#039; );
		$this-&gt;strings[&#039;remove_old_failed&#039;]   = __( &#039;Could not remove the old theme.&#039; );
		$this-&gt;strings[&#039;process_failed&#039;]      = __( &#039;Theme update failed.&#039; );
		$this-&gt;strings[&#039;process_success&#039;]     = __( &#039;Theme updated successfully.&#039; );
	}

	/**
	 * Initializes the installation strings.
	 *
	 * @since 2.8.0
	 */
	public function install_strings() {
		$this-&gt;strings[&#039;no_package&#039;] = __( &#039;Installation package not available.&#039; );
		/* translators: %s: Package URL. */
		$this-&gt;strings[&#039;downloading_package&#039;] = sprintf( __( &#039;Downloading installation package from %s&amp;#8230;&#039; ), &#039;&lt;span class=&quot;code pre&quot;&gt;%s&lt;/span&gt;&#039; );
		$this-&gt;strings[&#039;unpack_package&#039;]      = __( &#039;Unpacking the package&amp;#8230;&#039; );
		$this-&gt;strings[&#039;installing_package&#039;]  = __( &#039;Installing the theme&amp;#8230;&#039; );
		$this-&gt;strings[&#039;remove_old&#039;]          = __( &#039;Removing the old version of the theme&amp;#8230;&#039; );
		$this-&gt;strings[&#039;remove_old_failed&#039;]   = __( &#039;Could not remove the old theme.&#039; );
		$this-&gt;strings[&#039;no_files&#039;]            = __( &#039;The theme contains no files.&#039; );
		$this-&gt;strings[&#039;process_failed&#039;]      = __( &#039;Theme installation failed.&#039; );
		$this-&gt;strings[&#039;process_success&#039;]     = __( &#039;Theme installed successfully.&#039; );
		/* translators: 1: Theme name, 2: Theme version. */
		$this-&gt;strings[&#039;process_success_specific&#039;] = __( &#039;Successfully installed the theme &lt;strong&gt;%1$s %2$s&lt;/strong&gt;.&#039; );
		$this-&gt;strings[&#039;parent_theme_search&#039;]      = __( &#039;This theme requires a parent theme. Checking if it is installed&amp;#8230;&#039; );
		/* translators: 1: Theme name, 2: Theme version. */
		$this-&gt;strings[&#039;parent_theme_prepare_install&#039;] = __( &#039;Preparing to install &lt;strong&gt;%1$s %2$s&lt;/strong&gt;&amp;#8230;&#039; );
		/* translators: 1: Theme name, 2: Theme version. */
		$this-&gt;strings[&#039;parent_theme_currently_installed&#039;] = __( &#039;The parent theme, &lt;strong&gt;%1$s %2$s&lt;/strong&gt;, is currently installed.&#039; );
		/* translators: 1: Theme name, 2: Theme version. */
		$this-&gt;strings[&#039;parent_theme_install_success&#039;] = __( &#039;Successfully installed the parent theme, &lt;strong&gt;%1$s %2$s&lt;/strong&gt;.&#039; );
		/* translators: %s: Theme name. */
		$this-&gt;strings[&#039;parent_theme_not_found&#039;] = sprintf( __( &#039;&lt;strong&gt;The parent theme could not be found.&lt;/strong&gt; You will need to install the parent theme, %s, before you can use this child theme.&#039; ), &#039;&lt;strong&gt;%s&lt;/strong&gt;&#039; );
		/* translators: %s: Theme error. */
		$this-&gt;strings[&#039;current_theme_has_errors&#039;] = __( &#039;The active theme has the following error: &quot;%s&quot;.&#039; );

		if ( ! empty( $this-&gt;skin-&gt;overwrite ) ) {
			if ( &#039;update-theme&#039; === $this-&gt;skin-&gt;overwrite ) {
				$this-&gt;strings[&#039;installing_package&#039;] = __( &#039;Updating the theme&amp;#8230;&#039; );
				$this-&gt;strings[&#039;process_failed&#039;]     = __( &#039;Theme update failed.&#039; );
				$this-&gt;strings[&#039;process_success&#039;]    = __( &#039;Theme updated successfully.&#039; );
			}

			if ( &#039;downgrade-theme&#039; === $this-&gt;skin-&gt;overwrite ) {
				$this-&gt;strings[&#039;installing_package&#039;] = __( &#039;Downgrading the theme&amp;#8230;&#039; );
				$this-&gt;strings[&#039;process_failed&#039;]     = __( &#039;Theme downgrade failed.&#039; );
				$this-&gt;strings[&#039;process_success&#039;]    = __( &#039;Theme downgraded successfully.&#039; );
			}
		}
	}

	/**
	 * Checks if a child theme is being installed and its parent also needs to be installed.
	 *
	 * Hooked to the {@see &#039;upgrader_post_install&#039;} filter by Theme_Upgrader::install().
	 *
	 * @since 3.4.0
	 *
	 * @param bool  $install_result
	 * @param array $hook_extra
	 * @param array $child_result
	 * @return bool
	 */
	public function check_parent_theme_filter( $install_result, $hook_extra, $child_result ) {
		// Check to see if we need to install a parent theme.
		$theme_info = $this-&gt;theme_info();

		if ( ! $theme_info-&gt;parent() ) {
			return $install_result;
		}

		$this-&gt;skin-&gt;feedback( &#039;parent_theme_search&#039; );

		if ( ! $theme_info-&gt;parent()-&gt;errors() ) {
			$this-&gt;skin-&gt;feedback( &#039;parent_theme_currently_installed&#039;, $theme_info-&gt;parent()-&gt;display( &#039;Name&#039; ), $theme_info-&gt;parent()-&gt;display( &#039;Version&#039; ) );
			// We already have the theme, fall through.
			return $install_result;
		}

		// We don&#039;t have the parent theme, let&#039;s install it.
		$api = themes_api(
			&#039;theme_information&#039;,
			array(
				&#039;slug&#039;   =&gt; $theme_info-&gt;get( &#039;Template&#039; ),
				&#039;fields&#039; =&gt; array(
					&#039;sections&#039; =&gt; false,
					&#039;tags&#039;     =&gt; false,
				),
			)
		); // Save on a bit of bandwidth.

		if ( ! $api || is_wp_error( $api ) ) {
			$this-&gt;skin-&gt;feedback( &#039;parent_theme_not_found&#039;, $theme_info-&gt;get( &#039;Template&#039; ) );
			// Don&#039;t show activate or preview actions after installation.
			add_filter( &#039;install_theme_complete_actions&#039;, array( $this, &#039;hide_activate_preview_actions&#039; ) );
			return $install_result;
		}

		// Backup required data we&#039;re going to override:
		$child_api             = $this-&gt;skin-&gt;api;
		$child_success_message = $this-&gt;strings[&#039;process_success&#039;];

		// Override them.
		$this-&gt;skin-&gt;api = $api;

		$this-&gt;strings[&#039;process_success_specific&#039;] = $this-&gt;strings[&#039;parent_theme_install_success&#039;];

		$this-&gt;skin-&gt;feedback( &#039;parent_theme_prepare_install&#039;, $api-&gt;name, $api-&gt;version );

		add_filter( &#039;install_theme_complete_actions&#039;, &#039;__return_false&#039;, 999 ); // Don&#039;t show any actions after installing the theme.

		// Install the parent theme.
		$parent_result = $this-&gt;run(
			array(
				&#039;package&#039;           =&gt; $api-&gt;download_link,
				&#039;destination&#039;       =&gt; get_theme_root(),
				&#039;clear_destination&#039; =&gt; false, // Do not overwrite files.
				&#039;clear_working&#039;     =&gt; true,
			)
		);

		if ( is_wp_error( $parent_result ) ) {
			add_filter( &#039;install_theme_complete_actions&#039;, array( $this, &#039;hide_activate_preview_actions&#039; ) );
		}

		// Start cleaning up after the parent&#039;s installation.
		remove_filter( &#039;install_theme_complete_actions&#039;, &#039;__return_false&#039;, 999 );

		// Reset child&#039;s result and data.
		$this-&gt;result                     = $child_result;
		$this-&gt;skin-&gt;api                  = $child_api;
		$this-&gt;strings[&#039;process_success&#039;] = $child_success_message;

		return $install_result;
	}

	/**
	 * Don&#039;t display the activate and preview actions to the user.
	 *
	 * Hooked to the {@see &#039;install_theme_complete_actions&#039;} filter by
	 * Theme_Upgrader::check_parent_theme_filter() when installing
	 * a child theme and installing the parent theme fails.
	 *
	 * @since 3.4.0
	 *
	 * @param array $actions Preview actions.
	 * @return array
	 */
	public function hide_activate_preview_actions( $actions ) {
		unset( $actions[&#039;activate&#039;], $actions[&#039;preview&#039;] );
		return $actions;
	}

	/**
	 * Install a theme package.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
	 *
	 * @param string $package The full local path or URI of the package.
	 * @param array  $args {
	 *     Optional. Other arguments for installing a theme package. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the updates cache if successful.
	 *                                    Default true.
	 * }
	 *
	 * @return bool|WP_Error True if the installation was successful, false or a WP_Error object otherwise.
	 */
	public function install( $package, $args = array() ) {
		$defaults    = array(
			&#039;clear_update_cache&#039; =&gt; true,
			&#039;overwrite_package&#039;  =&gt; false, // Do not overwrite files.
		);
		$parsed_args = wp_parse_args( $args, $defaults );

		$this-&gt;init();
		$this-&gt;install_strings();

		add_filter( &#039;upgrader_source_selection&#039;, array( $this, &#039;check_package&#039; ) );
		add_filter( &#039;upgrader_post_install&#039;, array( $this, &#039;check_parent_theme_filter&#039; ), 10, 3 );

		if ( $parsed_args[&#039;clear_update_cache&#039;] ) {
			// Clear cache so wp_update_themes() knows about the new theme.
			add_action( &#039;upgrader_process_complete&#039;, &#039;wp_clean_themes_cache&#039;, 9, 0 );
		}

		$this-&gt;run(
			array(
				&#039;package&#039;           =&gt; $package,
				&#039;destination&#039;       =&gt; get_theme_root(),
				&#039;clear_destination&#039; =&gt; $parsed_args[&#039;overwrite_package&#039;],
				&#039;clear_working&#039;     =&gt; true,
				&#039;hook_extra&#039;        =&gt; array(
					&#039;type&#039;   =&gt; &#039;theme&#039;,
					&#039;action&#039; =&gt; &#039;install&#039;,
				),
			)
		);

		remove_action( &#039;upgrader_process_complete&#039;, &#039;wp_clean_themes_cache&#039;, 9 );
		remove_filter( &#039;upgrader_source_selection&#039;, array( $this, &#039;check_package&#039; ) );
		remove_filter( &#039;upgrader_post_install&#039;, array( $this, &#039;check_parent_theme_filter&#039; ) );

		if ( ! $this-&gt;result || is_wp_error( $this-&gt;result ) ) {
			return $this-&gt;result;
		}

		// Refresh the Theme Update information.
		wp_clean_themes_cache( $parsed_args[&#039;clear_update_cache&#039;] );

		if ( $parsed_args[&#039;overwrite_package&#039;] ) {
			/** This action is documented in wp-admin/includes/class-plugin-upgrader.php */
			do_action( &#039;upgrader_overwrote_package&#039;, $package, $this-&gt;new_theme_data, &#039;theme&#039; );
		}

		return true;
	}

	/**
	 * Upgrades a theme.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
	 *
	 * @param string $theme The theme slug.
	 * @param array  $args {
	 *     Optional. Other arguments for upgrading a theme. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the update cache if successful.
	 *                                    Default true.
	 * }
	 * @return bool|WP_Error True if the upgrade was successful, false or a WP_Error object otherwise.
	 */
	public function upgrade( $theme, $args = array() ) {
		$defaults    = array(
			&#039;clear_update_cache&#039; =&gt; true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

		$this-&gt;init();
		$this-&gt;upgrade_strings();

		// Is an update available?
		$current = get_site_transient( &#039;update_themes&#039; );
		if ( ! isset( $current-&gt;response[ $theme ] ) ) {
			$this-&gt;skin-&gt;before();
			$this-&gt;skin-&gt;set_result( false );
			$this-&gt;skin-&gt;error( &#039;up_to_date&#039; );
			$this-&gt;skin-&gt;after();
			return false;
		}

		$upgrade_data = $current-&gt;response[ $theme ];

		add_filter( &#039;upgrader_pre_install&#039;, array( $this, &#039;current_before&#039; ), 10, 2 );
		add_filter( &#039;upgrader_post_install&#039;, array( $this, &#039;current_after&#039; ), 10, 2 );
		add_filter( &#039;upgrader_clear_destination&#039;, array( $this, &#039;delete_old_theme&#039; ), 10, 4 );
		if ( $parsed_args[&#039;clear_update_cache&#039;] ) {
			// Clear cache so wp_update_themes() knows about the new theme.
			add_action( &#039;upgrader_process_complete&#039;, &#039;wp_clean_themes_cache&#039;, 9, 0 );
		}

		$this-&gt;run(
			array(
				&#039;package&#039;           =&gt; $upgrade_data[&#039;package&#039;],
				&#039;destination&#039;       =&gt; get_theme_root( $theme ),
				&#039;clear_destination&#039; =&gt; true,
				&#039;clear_working&#039;     =&gt; true,
				&#039;hook_extra&#039;        =&gt; array(
					&#039;theme&#039;       =&gt; $theme,
					&#039;type&#039;        =&gt; &#039;theme&#039;,
					&#039;action&#039;      =&gt; &#039;update&#039;,
					&#039;temp_backup&#039; =&gt; array(
						&#039;slug&#039; =&gt; $theme,
						&#039;src&#039;  =&gt; get_theme_root( $theme ),
						&#039;dir&#039;  =&gt; &#039;themes&#039;,
					),
				),
			)
		);

		remove_action( &#039;upgrader_process_complete&#039;, &#039;wp_clean_themes_cache&#039;, 9 );
		remove_filter( &#039;upgrader_pre_install&#039;, array( $this, &#039;current_before&#039; ) );
		remove_filter( &#039;upgrader_post_install&#039;, array( $this, &#039;current_after&#039; ) );
		remove_filter( &#039;upgrader_clear_destination&#039;, array( $this, &#039;delete_old_theme&#039; ) );

		if ( ! $this-&gt;result || is_wp_error( $this-&gt;result ) ) {
			return $this-&gt;result;
		}

		wp_clean_themes_cache( $parsed_args[&#039;clear_update_cache&#039;] );

		/*
		 * Ensure any future auto-update failures trigger a failure email by removing
		 * the last failure notification from the list when themes update successfully.
		 */
		$past_failure_emails = get_option( &#039;auto_plugin_theme_update_emails&#039;, array() );

		if ( isset( $past_failure_emails[ $theme ] ) ) {
			unset( $past_failure_emails[ $theme ] );
			update_option( &#039;auto_plugin_theme_update_emails&#039;, $past_failure_emails );
		}

		return true;
	}

	/**
	 * Upgrades several themes at once.
	 *
	 * @since 3.0.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
	 *
	 * @param string[] $themes Array of the theme slugs.
	 * @param array    $args {
	 *     Optional. Other arguments for upgrading several themes at once. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the update cache if successful.
	 *                                    Default true.
	 * }
	 * @return array[]|false An array of results, or false if unable to connect to the filesystem.
	 */
	public function bulk_upgrade( $themes, $args = array() ) {
		$wp_version  = wp_get_wp_version();
		$defaults    = array(
			&#039;clear_update_cache&#039; =&gt; true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

		$this-&gt;init();
		$this-&gt;bulk = true;
		$this-&gt;upgrade_strings();

		$current = get_site_transient( &#039;update_themes&#039; );

		add_filter( &#039;upgrader_pre_install&#039;, array( $this, &#039;current_before&#039; ), 10, 2 );
		add_filter( &#039;upgrader_post_install&#039;, array( $this, &#039;current_after&#039; ), 10, 2 );
		add_filter( &#039;upgrader_clear_destination&#039;, array( $this, &#039;delete_old_theme&#039; ), 10, 4 );

		$this-&gt;skin-&gt;header();

		// Connect to the filesystem first.
		$connected = $this-&gt;fs_connect( array( WP_CONTENT_DIR ) );
		if ( ! $connected ) {
			$this-&gt;skin-&gt;footer();
			return false;
		}

		$this-&gt;skin-&gt;bulk_header();

		/*
		 * Only start maintenance mode if:
		 * - running Multisite and there are one or more themes specified, OR
		 * - a theme with an update available is currently in use.
		 * @todo For multisite, maintenance mode should only kick in for individual sites if at all possible.
		 */
		$maintenance = ( is_multisite() &amp;&amp; ! empty( $themes ) );
		foreach ( $themes as $theme ) {
			$maintenance = $maintenance || get_stylesheet() === $theme || get_template() === $theme;
		}
		if ( $maintenance ) {
			$this-&gt;maintenance_mode( true );
		}

		$results = array();

		$this-&gt;update_count   = count( $themes );
		$this-&gt;update_current = 0;
		foreach ( $themes as $theme ) {
			++$this-&gt;update_current;

			$this-&gt;skin-&gt;theme_info = $this-&gt;theme_info( $theme );

			if ( ! isset( $current-&gt;response[ $theme ] ) ) {
				$this-&gt;skin-&gt;set_result( true );
				$this-&gt;skin-&gt;before();
				$this-&gt;skin-&gt;feedback( &#039;up_to_date&#039; );
				$this-&gt;skin-&gt;after();
				$results[ $theme ] = true;
				continue;
			}

			// Get the URL to the zip file.
			$upgrade_data = $current-&gt;response[ $theme ];

			if ( isset( $upgrade_data[&#039;requires&#039;] ) &amp;&amp; ! is_wp_version_compatible( $upgrade_data[&#039;requires&#039;] ) ) {
				$result = new WP_Error(
					&#039;incompatible_wp_required_version&#039;,
					sprintf(
						/* translators: 1: Current WordPress version, 2: WordPress version required by the new theme version. */
						__( &#039;Your WordPress version is %1$s, however the new theme version requires %2$s.&#039; ),
						$wp_version,
						$upgrade_data[&#039;requires&#039;]
					)
				);

				$this-&gt;skin-&gt;before( $result );
				$this-&gt;skin-&gt;error( $result );
				$this-&gt;skin-&gt;after();
			} elseif ( isset( $upgrade_data[&#039;requires_php&#039;] ) &amp;&amp; ! is_php_version_compatible( $upgrade_data[&#039;requires_php&#039;] ) ) {
				$result = new WP_Error(
					&#039;incompatible_php_required_version&#039;,
					sprintf(
						/* translators: 1: Current PHP version, 2: PHP version required by the new theme version. */
						__( &#039;The PHP version on your server is %1$s, however the new theme version requires %2$s.&#039; ),
						PHP_VERSION,
						$upgrade_data[&#039;requires_php&#039;]
					)
				);

				$this-&gt;skin-&gt;before( $result );
				$this-&gt;skin-&gt;error( $result );
				$this-&gt;skin-&gt;after();
			} else {
				add_filter( &#039;upgrader_source_selection&#039;, array( $this, &#039;check_package&#039; ) );
				$result = $this-&gt;run(
					array(
						&#039;package&#039;           =&gt; $upgrade_data[&#039;package&#039;],
						&#039;destination&#039;       =&gt; get_theme_root( $theme ),
						&#039;clear_destination&#039; =&gt; true,
						&#039;clear_working&#039;     =&gt; true,
						&#039;is_multi&#039;          =&gt; true,
						&#039;hook_extra&#039;        =&gt; array(
							&#039;theme&#039;       =&gt; $theme,
							&#039;temp_backup&#039; =&gt; array(
								&#039;slug&#039; =&gt; $theme,
								&#039;src&#039;  =&gt; get_theme_root( $theme ),
								&#039;dir&#039;  =&gt; &#039;themes&#039;,
							),
						),
					)
				);
				remove_filter( &#039;upgrader_source_selection&#039;, array( $this, &#039;check_package&#039; ) );
			}

			$results[ $theme ] = $result;

			// Prevent credentials auth screen from displaying multiple times.
			if ( false === $result ) {
				break;
			}
		} // End foreach $themes.

		$this-&gt;maintenance_mode( false );

		// Refresh the Theme Update information.
		wp_clean_themes_cache( $parsed_args[&#039;clear_update_cache&#039;] );

		/** This action is documented in wp-admin/includes/class-wp-upgrader.php */
		do_action(
			&#039;upgrader_process_complete&#039;,
			$this,
			array(
				&#039;action&#039; =&gt; &#039;update&#039;,
				&#039;type&#039;   =&gt; &#039;theme&#039;,
				&#039;bulk&#039;   =&gt; true,
				&#039;themes&#039; =&gt; $themes,
			)
		);

		$this-&gt;skin-&gt;bulk_footer();

		$this-&gt;skin-&gt;footer();

		// Cleanup our hooks, in case something else does an upgrade on this connection.
		remove_filter( &#039;upgrader_pre_install&#039;, array( $this, &#039;current_before&#039; ) );
		remove_filter( &#039;upgrader_post_install&#039;, array( $this, &#039;current_after&#039; ) );
		remove_filter( &#039;upgrader_clear_destination&#039;, array( $this, &#039;delete_old_theme&#039; ) );

		/*
		 * Ensure any future auto-update failures trigger a failure email by removing
		 * the last failure notification from the list when themes update successfully.
		 */
		$past_failure_emails = get_option( &#039;auto_plugin_theme_update_emails&#039;, array() );

		foreach ( $results as $theme =&gt; $result ) {
			// Maintain last failure notification when themes failed to update manually.
			if ( ! $result || is_wp_error( $result ) || ! isset( $past_failure_emails[ $theme ] ) ) {
				continue;
			}

			unset( $past_failure_emails[ $theme ] );
		}

		update_option( &#039;auto_plugin_theme_update_emails&#039;, $past_failure_emails );

		return $results;
	}

	/**
	 * Checks that the package source contains a valid theme.
	 *
	 * Hooked to the {@see &#039;upgrader_source_selection&#039;} filter by Theme_Upgrader::install().
	 *
	 * @since 3.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string $source The path to the downloaded package source.
	 * @return string|WP_Error The source as passed, or a WP_Error object on failure.
	 */
	public function check_package( $source ) {
		global $wp_filesystem;

		$wp_version           = wp_get_wp_version();
		$this-&gt;new_theme_data = array();

		if ( is_wp_error( $source ) ) {
			return $source;
		}

		// Check that the folder contains a valid theme.
		$working_directory = str_replace( $wp_filesystem-&gt;wp_content_dir(), trailingslashit( WP_CONTENT_DIR ), $source );
		if ( ! is_dir( $working_directory ) ) { // Confidence check, if the above fails, let&#039;s not prevent installation.
			return $source;
		}

		// A proper archive should have a style.css file in the single subdirectory.
		if ( ! file_exists( $working_directory . &#039;style.css&#039; ) ) {
			return new WP_Error(
				&#039;incompatible_archive_theme_no_style&#039;,
				$this-&gt;strings[&#039;incompatible_archive&#039;],
				sprintf(
					/* translators: %s: style.css */
					__( &#039;The theme is missing the %s stylesheet.&#039; ),
					&#039;&lt;code&gt;style.css&lt;/code&gt;&#039;
				)
			);
		}

		// All these headers are needed on Theme_Installer_Skin::do_overwrite().
		$new_theme_data = get_file_data(
			$working_directory . &#039;style.css&#039;,
			array(
				&#039;Name&#039;        =&gt; &#039;Theme Name&#039;,
				&#039;Version&#039;     =&gt; &#039;Version&#039;,
				&#039;Author&#039;      =&gt; &#039;Author&#039;,
				&#039;Template&#039;    =&gt; &#039;Template&#039;,
				&#039;RequiresWP&#039;  =&gt; &#039;Requires at least&#039;,
				&#039;RequiresPHP&#039; =&gt; &#039;Requires PHP&#039;,
			)
		);

		if ( empty( $new_theme_data[&#039;Name&#039;] ) ) {
			return new WP_Error(
				&#039;incompatible_archive_theme_no_name&#039;,
				$this-&gt;strings[&#039;incompatible_archive&#039;],
				sprintf(
					/* translators: %s: style.css */
					__( &#039;The %s stylesheet does not contain a valid theme header.&#039; ),
					&#039;&lt;code&gt;style.css&lt;/code&gt;&#039;
				)
			);
		}

		/*
		 * Parent themes must contain an index file:
		 * - classic themes require /index.php
		 * - block themes require /templates/index.html or block-templates/index.html (deprecated 5.9.0).
		 */
		if (
			empty( $new_theme_data[&#039;Template&#039;] ) &amp;&amp;
			! file_exists( $working_directory . &#039;index.php&#039; ) &amp;&amp;
			! file_exists( $working_directory . &#039;templates/index.html&#039; ) &amp;&amp;
			! file_exists( $working_directory . &#039;block-templates/index.html&#039; )
		) {
			return new WP_Error(
				&#039;incompatible_archive_theme_no_index&#039;,
				$this-&gt;strings[&#039;incompatible_archive&#039;],
				sprintf(
					/* translators: 1: templates/index.html, 2: index.php, 3: Documentation URL, 4: Template, 5: style.css */
					__( &#039;Template is missing. Standalone themes need to have a %1$s or %2$s template file. &lt;a href=&quot;%3$s&quot;&gt;Child themes&lt;/a&gt; need to have a %4$s header in the %5$s stylesheet.&#039; ),
					&#039;&lt;code&gt;templates/index.html&lt;/code&gt;&#039;,
					&#039;&lt;code&gt;index.php&lt;/code&gt;&#039;,
					__( &#039;https://developer.wordpress.org/themes/advanced-topics/child-themes/&#039; ),
					&#039;&lt;code&gt;Template&lt;/code&gt;&#039;,
					&#039;&lt;code&gt;style.css&lt;/code&gt;&#039;
				)
			);
		}

		$requires_php = isset( $new_theme_data[&#039;RequiresPHP&#039;] ) ? $new_theme_data[&#039;RequiresPHP&#039;] : null;
		$requires_wp  = isset( $new_theme_data[&#039;RequiresWP&#039;] ) ? $new_theme_data[&#039;RequiresWP&#039;] : null;

		if ( ! is_php_version_compatible( $requires_php ) ) {
			$error = sprintf(
				/* translators: 1: Current PHP version, 2: Version required by the uploaded theme. */
				__( &#039;The PHP version on your server is %1$s, however the uploaded theme requires %2$s.&#039; ),
				PHP_VERSION,
				$requires_php
			);

			return new WP_Error( &#039;incompatible_php_required_version&#039;, $this-&gt;strings[&#039;incompatible_archive&#039;], $error );
		}
		if ( ! is_wp_version_compatible( $requires_wp ) ) {
			$error = sprintf(
				/* translators: 1: Current WordPress version, 2: Version required by the uploaded theme. */
				__( &#039;Your WordPress version is %1$s, however the uploaded theme requires %2$s.&#039; ),
				$wp_version,
				$requires_wp
			);

			return new WP_Error( &#039;incompatible_wp_required_version&#039;, $this-&gt;strings[&#039;incompatible_archive&#039;], $error );
		}

		$this-&gt;new_theme_data = $new_theme_data;

		return $source;
	}

	/**
	 * Turns on maintenance mode before attempting to upgrade the active theme.
	 *
	 * Hooked to the {@see &#039;upgrader_pre_install&#039;} filter by Theme_Upgrader::upgrade() and
	 * Theme_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @param bool|WP_Error $response The installation response before the installation has started.
	 * @param array         $theme    Theme arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function current_before( $response, $theme ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

		$theme = isset( $theme[&#039;theme&#039;] ) ? $theme[&#039;theme&#039;] : &#039;&#039;;

		// Only run if active theme.
		if ( get_stylesheet() !== $theme ) {
			return $response;
		}

		// Change to maintenance mode. Bulk edit handles this separately.
		if ( ! $this-&gt;bulk ) {
			$this-&gt;maintenance_mode( true );
		}

		return $response;
	}

	/**
	 * Turns off maintenance mode after upgrading the active theme.
	 *
	 * Hooked to the {@see &#039;upgrader_post_install&#039;} filter by Theme_Upgrader::upgrade()
	 * and Theme_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @param bool|WP_Error $response The installation response after the installation has finished.
	 * @param array         $theme    Theme arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function current_after( $response, $theme ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

		$theme = isset( $theme[&#039;theme&#039;] ) ? $theme[&#039;theme&#039;] : &#039;&#039;;

		// Only run if active theme.
		if ( get_stylesheet() !== $theme ) {
			return $response;
		}

		// Ensure stylesheet name hasn&#039;t changed after the upgrade:
		if ( get_stylesheet() === $theme &amp;&amp; $theme !== $this-&gt;result[&#039;destination_name&#039;] ) {
			wp_clean_themes_cache();
			$stylesheet = $this-&gt;result[&#039;destination_name&#039;];
			switch_theme( $stylesheet );
		}

		// Time to remove maintenance mode. Bulk edit handles this separately.
		if ( ! $this-&gt;bulk ) {
			$this-&gt;maintenance_mode( false );
		}
		return $response;
	}

	/**
	 * Deletes the old theme during an upgrade.
	 *
	 * Hooked to the {@see &#039;upgrader_clear_destination&#039;} filter by Theme_Upgrader::upgrade()
	 * and Theme_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param bool   $removed
	 * @param string $local_destination
	 * @param string $remote_destination
	 * @param array  $theme
	 * @return bool
	 */
	public function delete_old_theme( $removed, $local_destination, $remote_destination, $theme ) {
		global $wp_filesystem;

		if ( is_wp_error( $removed ) ) {
			return $removed; // Pass errors through.
		}

		if ( ! isset( $theme[&#039;theme&#039;] ) ) {
			return $removed;
		}

		$theme      = $theme[&#039;theme&#039;];
		$themes_dir = trailingslashit( $wp_filesystem-&gt;wp_themes_dir( $theme ) );
		if ( $wp_filesystem-&gt;exists( $themes_dir . $theme ) ) {
			if ( ! $wp_filesystem-&gt;delete( $themes_dir . $theme, true ) ) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Gets the WP_Theme object for a theme.
	 *
	 * @since 2.8.0
	 * @since 3.0.0 The `$theme` argument was added.
	 *
	 * @param string $theme The directory name of the theme. This is optional, and if not supplied,
	 *                      the directory name from the last result will be used.
	 * @return WP_Theme|false The theme&#039;s info object, or false `$theme` is not supplied
	 *                        and the last result isn&#039;t set.
	 */
	public function theme_info( $theme = null ) {
		if ( empty( $theme ) ) {
			if ( ! empty( $this-&gt;result[&#039;destination_name&#039;] ) ) {
				$theme = $this-&gt;result[&#039;destination_name&#039;];
			} else {
				return false;
			}
		}

		$theme = wp_get_theme( $theme );
		$theme-&gt;cache_delete();

		return $theme;
	}
}
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