解決 WordPress 4.9 頁面模板功能無法正常使用

WordPress 4.9.1 及以上版本已經默認修復該問題,建議直接更新到最新版本,無需再看本文下面的內容瞭!

WordPress 4.9 有一個重要更新是:在WP後臺編輯主題和外掛文件時,支援按層級顯示所有文件。為瞭性能考慮,使用瞭 transient 緩存機制。但是卻沒有提供任何手動清除緩存的功能,導致有些用戶升級到 WordPress 4.9 以後,發現“頁面屬性 – 樣版”這個功能不能正常使用瞭,不顯示主題自帶的樣版文件!

要解決這個問題,我們可以添加下面的代碼到當前主題的 functions.php 就可以瞭:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
/**
 * Plugin name: WP Trac #42573: Fix for theme template file caching.
 * Description: Flush the theme file cache each time the admin screens are loaded which uses the file list.
 * Plugin URI: https://core.trac.wordpress.org/ticket/42573
 * Author: Weston Ruter, XWP.
 * Author URI: https://weston.ruter.net
 */
function wp_42573_fix_template_caching( WP_Screen $current_screen ) {
	// Only flush the file cache with each request to post list table, edit post screen, or theme editor.
	if ( ! in_array( $current_screen->base, array( 'post', 'edit', 'theme-editor' ), true ) ) {
		return;
	}
	$theme = wp_get_theme();
	if ( ! $theme ) {
		return;
	}
	$cache_hash = md5( $theme->get_theme_root() . '/' . $theme->get_stylesheet() );
	$label = sanitize_key( 'files_' . $cache_hash . '-' . $theme->get( 'Version' ) );
	$transient_key = substr( $label, 0, 29 ) . md5( $label );
	delete_transient( $transient_key );
}
add_action( 'current_screen', 'wp_42573_fix_template_caching' );

/**
* Plugin name: WP Trac #42573: Fix for theme template file caching.
* Description: Flush the theme file cache each time the admin screens are loaded which uses the file list.
* Plugin URI: https://core.trac.wordpress.org/ticket/42573
* Author: Weston Ruter, XWP.
* Author URI: https://weston.ruter.net
*/
function wp_42573_fix_template_caching( WP_Screen $current_screen ) {
// Only flush the file cache with each request to post list table, edit post screen, or theme editor.
if ( ! in_array( $current_screen->base, array( ‘post’, ‘edit’, ‘theme-editor’ ), true ) ) {
return;
}
$theme = wp_get_theme();
if ( ! $theme ) {
return;
}
$cache_hash = md5( $theme->get_theme_root() . ‘/’ . $theme->get_stylesheet() );
$label = sanitize_key( ‘files_’ . $cache_hash . ‘-‘ . $theme->get( ‘Version’ ) );
$transient_key = substr( $label, 0, 29 ) . md5( $label );
delete_transient( $transient_key );
}
add_action( ‘current_screen’, ‘wp_42573_fix_template_caching’ );

如果你不想編輯代碼,點擊下載此外掛安裝啟用即可:wp-42573

發佈留言