我正在为教育网站开发一个插件。我在插件中添加了3-4个页面模板，以便在插件激活时调用。

直到WordPress4.7, 它工作得很好；但当我将WordPress升级到最新版本时（从4.6.3), 页面模板甚至不会显示在页面属性部分。

以下是在旧版本（之前）中运行良好的代码4.7):

add_action( \'wp_loaded\', \'add_my_templates\' );
function add_my_templates() {
    if( is_admin() ){
        global $wp_object_cache;
        $current_theme = wp_get_theme();
        $templates = $current_theme->get_page_templates();
        $hash = md5( $current_theme->theme_root . \'/\'. $current_theme->stylesheet );
        $templates = $wp_object_cache->get( \'page_templates-\'. $hash, \'themes\' );
        $templates[\'templates/exams.php\'] = __(\'Exams\');
        $templates[\'templates/colleges.php\'] = __(\'Colleges\');
        $templates[\'templates/study_home.php\'] = __(\'Study Home\');
        $templates[\'templates/study_job_home.php\'] = __(\'Study Job Home\');
        wp_cache_replace( \'page_templates-\'. $hash, $templates, \'themes\' );
    }
    else {
        add_filter( \'page_template\', \'get_my_template\', 1 );
    }
}

function get_my_template( $template ) {
    $post = get_post();
    $page_template = get_post_meta( $post->ID, \'_wp_page_template\', true );
    if( $page_template == \'templates/study_home.php\' ) {
        $template = plugin_dir_path(__FILE__) . "templates/study_home.php";
    }
    if( $page_template == \'templates/study_job_home.php\' ) {
        $template = plugin_dir_path(__FILE__) . "templates/study_job_home.php";
    }
    if( $page_template == \'templates/exams.php\' ) {
        $template = plugin_dir_path(__FILE__) . "templates/exams.php";
    }
    if( $page_template == \'templates/colleges.php\' ) {
        $template = plugin_dir_path(__FILE__) . "templates/colleges.php";
    }
    return $template;
}