添加帖子类型的子菜单。

原型

_add_post_type_submenus()

源文件

路径:wp-includes/post.php

<?php
...
function _add_post_type_submenus() {
	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
		$ptype_obj = get_post_type_object( $ptype );
		// Sub-menus only.
		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true )
			continue;
		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
	}
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/_add_post_type_submenus/