Обычным способом добавить шаблон страницы или записи из плагина не получится. Для этого нужно создать класс:
// Add page template
class PageTemplater {
private static $instance; // A reference to an instance of this class.
protected $templates; // The array of templates that this plugin tracks.
public static function get_instance() { // Returns an instance of this class.
if ( null == self::$instance ) {
self::$instance = new PageTemplater();
}
return self::$instance;
}
private function __construct() { // Initializes the plugin by setting filters and administration functions.
$this->templates = array();
// Add a filter to the attributes metabox to inject template into the cache.
if ( version_compare( floatval( get_bloginfo( 'version' ) ), '4.7', '<' ) ) {
// 4.6 and older
add_filter(
'page_attributes_dropdown_pages_args',
array( $this, 'register_project_templates' )
);
} else {
// Add a filter to the wp 4.7 version attributes metabox
add_filter(
'theme_page_templates', array( $this, 'add_new_template' )
);
}
// 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(
'template-setquantity.php' => 'Request template for Set Quantity',
);
}
// Adds our template to the page dropdown for v4.7+
public function add_new_template( $posts_templates ) {
$posts_templates = array_merge( $posts_templates, $this->templates );
return $posts_templates;
}
// 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; // Get global post
if ( ! $post ) { // Return template if post is empty
return $template;
}
// Return default template if we don't have a custom one defined
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; // Return template
}
}
add_action( 'plugins_loaded', array( 'PageTemplater', 'get_instance' ) );При этом файл шаблона (template-setquantity.php) должен лежать в корне плагина. Request template for Set Quantity — название шаблона.
