我想，您的代码中的作用域有问题，并且您误用了操作。

让我解释一下。。。让我们看看这部分代码：

for($i =1; $i <= $options_foo[\'num_post_types\']; $i++) {
    global $options_foo;
    $singular = $options_foo[\'post_type_names\'][$i][\'singular\'];
    $plural = $options_foo[\'post_type_names\'][$i][\'plural\'];
    add_action(\'init\', function(){
        global $singular;

循环遍历所有选项，并针对其中的每一个选项：a）设置一些全局变量b）注册新操作init 挂钩init 使您的操作被逐一调用。但所有这些操作都将使用相同的全局变量值（因为它们早在…之前就设置好了）

下面是应该如何做：

add_action( \'init\', function () {
    global $options_foo;

    if ( $options_foo[\'num_post_types\'] > 0 ) {
        for ( $i=1; $i <= $options_foo[\'num_post_types\']; $i++) {
            $singular = $options_foo[\'post_type_names\'][$i][\'singular\'];
            $plural = $options_foo[\'post_type_names\'][$i][\'plural\'];

            $labels = array(
                \'name\'                  => $plural,
                \'singular_name\'         => $singular,
                \'add_new\'               => "New $singular",
                \'add_new_item\'          => "New $singular",
                \'edit_item\'             => "Edit $singular",
                \'new_item\'              => "New $singular",
                \'view_item\'             => "View $singular",
                \'view_items\'            => "View $plural",
                \'search_items\'          => "Search $plural",
                "not_found"             => "No $plural Found",
                "not_found_in_trash"    => "No $plural Found in Trash",
                \'all_items\'             => "All $plural",
                \'attributes\'            => "$singular Attributes",
                \'insert_into_item\'      => "Insert to $singular",
                \'uploaded_to_this_item\' => "Uploaded to this $singular"
            );
            $supports = array(\'title\', \'thumbnail\');
            $args = array(
                \'labels\'                => $labels,
                \'public\'                => true,
                \'exclude_from_search\'   => true,
                \'publicly_queryable\'    => true,
                \'show_in_nav_menus\'     => false,
                \'show_in_admin_bar\'     => false,
                \'menu_position\'         => 5,
                \'menu_icon\'             => \'dashicons-admin-home\',
                \'supports\'              => $supports,
                \'can_export\'            => \'true\'
            );
            register_post_type($singular, $args);
        }
    }
});