据我所知，这方面没有直接的方法。我也尝试过搜索，没有找到比下面更好的解决方案。
以下代码将为您提供所需的准确信息：
class PageTemplater {
/**
* A Unique Identifier
*/
protected $plugin_slug;
/**
* A reference to an instance of this class.
*/
private static $instance;
/**
* The array of templates that this plugin tracks.
*/
protected $templates;
/**
* Returns an instance of this class.
*/
public static function get_instance() {
if( null == self::$instance ) {
self::$instance = new PageTemplater();
}
return self::$instance;
}
/**
* Initializes the plugin by setting filters and administration functions.
*/
private function __construct() {
$this->templates = array();
// Add a filter to the attributes metabox to inject template into the cache.
add_filter(
\'page_attributes_dropdown_pages_args\',
array( $this, \'register_project_templates\' )
);
// Add a filter to the save post to inject out template into the page cache
add_filter(
\'wp_insert_post_data\',
array( $this, \'register_project_templates\' )
);
// Add a filter to the template include to determine if the page has our
// template assigned and return it\'s path
add_filter(
\'template_include\',
array( $this, \'view_project_template\')
);
// Add your templates to this array.
$this->templates = array(
\'goodtobebad-template.php\' => \'It\\\'s Good to Be Bad\',
);
}
/**
* Adds our template to the pages cache in order to trick WordPress
* into thinking the template file exists where it doens\'t really exist.
*
*/
public function register_project_templates( $atts ) {
// Create the key used for the themes cache
$cache_key = \'page_templates-\' . md5( get_theme_root() . \'/\' . get_stylesheet() );
// Retrieve the cache list.
// If it doesn\'t exist, or it\'s empty prepare an array
$templates = wp_get_theme()->get_page_templates();
if ( empty( $templates ) ) {
$templates = array();
}
// New cache, therefore remove the old one
wp_cache_delete( $cache_key , \'themes\');
// Now add our template to the list of templates by merging our templates
// with the existing templates array from the cache.
$templates = array_merge( $templates, $this->templates );
// Add the modified cache to allow WordPress to pick it up for listing
// available templates
wp_cache_add( $cache_key, $templates, \'themes\', 1800 );
return $atts;
}
/**
* Checks if the template is assigned to the page
*/
public function view_project_template( $template ) {
global $post;
if (!isset($this->templates[get_post_meta(
$post->ID, \'_wp_page_template\', true
)] ) ) {
return $template;
}
$file = plugin_dir_path(__FILE__). get_post_meta(
$post->ID, \'_wp_page_template\', true
);
// Just to be safe, we check if the file exist first
if( file_exists( $file ) ) {
return $file;
}
else { echo $file; }
return $template;
}
}
add_action( \'plugins_loaded\', array( \'PageTemplater\', \'get_instance\' ) );
Here is the full tutorial 详细说明正在发生的事情以及原因。
