How to add meta fields in wordpress when saving a post?

Question

WordPress

I add code to functions.php

function sources_init($post_id) {
if(wp_is_post_revision($post_id)) return;
add_post_meta($post_id, '_sources', 'ТЕСТ');
}
add_action('save_post', 'sources_init');

Then I look into the database, and it's empty there. Where did you go wrong?

Answer 1

the problem was in the meta-box plugin, conflicted