来自插件的动态WordPress页面模板

Question

我正在编写一个插件，它需要动态调整页面模板（通过插件设置），然后加载到 WordPress 下拉列表中。我想有一种很好的方法可以将这种数据插入页面缓存中，但我的编程无法做到这一点！

有什么想法吗？

Answer 1

这是我

的代码解决方案（灵感来自Tom McFarlin）。

这是为插件设计的（模板文件在插件的根目录中搜索）。如果需要，可以更改此设置 - 查看我的完整教程 http://www.wpexplorer.com/wordpress-page-templates-plugin/以获取有关此解决方案的更多详细信息。这些文件的格式也与直接包含在主题中的格式完全相同。

若要自定义，只需在 __construct 方法中编辑以下代码块;

   $this->templates = array(
       'goodtobebad-template.php'     => 'It's Good to Be Bad',
   );

完整代码;

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' ) );

查看我关于此的教程以获取更多信息。

http://www.wpexplorer.com/wordpress-page-templates-plugin/

我希望这对您想做的事情有所帮助:)