这个wp_update_post 钩子将调用同一操作两次，作为save_post_{$post->post_type} 在此函数中调用。我想补充一下remove_action( \'save_post_tribe_events\', \'set_to_pending\'); 之前wp_update_post( $post ); 和add_action( \'save_post_tribe_events\', \'set_to_pending\', 10, 3 ); 工作后：）

 function set_to_pending($id, $post, $update){  
    $the_post = print_r($post, true);
    $the_post_author = $post->post_author;
    $the_post_url = get_edit_post_link($id);
    $the_post_url = wp_specialchars_decode($the_post_url);
    if($the_post_author ==1 || $the_post_author == 2) {
        
    } else {

        if (defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE ) {
            return;
        }
    
        if (wp_is_post_revision($id)) {
            return;
        }
    
        if (wp_is_post_autosave($id)) {
            return;
        }
    
        // if new post
        if (!$update) {
            return;
        }

        if($post->post_status == \'trash\') {
            return;
        }
    
        $post->post_status = \'pending\'; 
        remove_action( \'save_post_tribe_events\', \'set_to_pending\');
        wp_update_post( $post );
        
        $times = did_action(\'save_post_tribe_events\');
        if( $times === 1){
            wp_mail(\'[email protected]\', \'Pending Event\', $the_post_url);
        }
        //Add action here to prevent sending mail twice
        add_action( \'save_post_tribe_events\', \'set_to_pending\', 10, 3 );
        
    }

}
add_action( \'save_post_tribe_events\', \'set_to_pending\', 10, 3 );