Get custom fields values in filter on wp_insert_post_data
Tweak to Riadh's accepted answer (would add as a comment but haven't got enough rep yet):
As documented in the WordPress Codex wp_update_post
includes the save_post
hook so calling wp_update_post()
inside the save_post
hook creates an infinite loop. To avoid this, unhook then rehook your function like so:
add_action('save_post', 'change_title');function change_title($post_id) { $time = get_field('time',$post_id); $post_title = 'Topic created at '. $time; // unhook this function so it doesn't loop infinitely remove_action('save_post', 'change_title'); // update the post, which calls save_post again wp_update_post(array('ID' => $post_id, 'post_title' => $post_title)); // re-hook this function add_action('save_post', 'change_title');}
You can actually access the global $_POST variable for your field value , but i guess you can do it in a cleaner way by using the save_post action to update your post's title, eg:
add_action('save_post', 'change_title');function change_title($post_id) { $time = get_field('time',$post_id); $post_title = 'Topic created at '. $time; // unhook this function so it doesn't loop infinitely remove_action('save_post', 'change_title'); // update the post, which calls save_post again wp_update_post(array('ID' => $post_id, 'post_title' => $post_title)); // re-hook this function add_action('save_post', 'change_title');}
assuming that your ACF fieldname is "time".
Edit: Updated the answer as per Mark Chitty's answer.
You may try this
add_filter( 'wp_insert_post_data', 'change_title', '99', 2 );function change_title($data , $postarr){ $custom_field = 'custom_filed_name'; $post_id = $postarr['ID']; $time = get_post_meta( $post_id, $custom_field, true ); // Now you have the value, do whatever you want}