Wordpress save_post钩子有错误的帖子？

Question

I'm getting some odd results saving meta values to my custom post types using the save_post hook. The data is saved to the incorrect post.

If I log the post ID using the code below, i see that the is is not the correct, that is while i edit post 7890, the log entry is 3345 (and thats where the saved data is put)

Have i misunderstood how the save_post hook works? Any help appreciated :)

add_action('save_post','save_data');
function save_data($post_id){
        $file = 'log.txt';
        $copystring = $post_id ."
";
        file_put_contents($file, $copystring, FILE_APPEND | LOCK_EX);
    }

thank you

Answer 1

Basically you are using it correctly. The $post_id should be the ID of the post to save. Read more here: https://codex.wordpress.org/Plugin_API/Action_Reference/save_post

However there could be various reasons why you are receiving the wrong post ID here.

• Saving the post triggers the save process of another post
• you are receiving some revision ID
• you are sending wrong ID data from your form
• maybe others ...

In the save post hook callback you should check if the post is of the correct post type and that it is not a revision or something.

$post = get_post($post_id);

if($post->post_type != 'desired-post-type') {
return;
}

if(wp_is_post_revision( $post_id ) {
return;
}

... maybe some other checks.

What is post 3345? Print it to your console and check. Most probably it is of a different post type or you are submitting the wrong ID.