save_post to update field if other field has changed

• physalis

• May 16, 2023 at 10:55 am

I thought I got it all sorted, but it just doesn’t work the way I think it should.
Upon saving a post, I want to check if the value of a field (‘zip’) has been changed (compared to the stored value), and then change the value of another field (‘status’) accordingly. This would be my function:

function my_acf_save_post( $post_id ) {

	// Get previous value
    $zip_old = get_field('zip', $post_id);

	// Get value from input
	$zip_new = $_POST['acf']['field_6463644299953'];

    if($zip_old != $zip_new) {
        $status = 'changed';
    } else {
		$status = 'unchanged';
	}

	// Update field with $status message
	update_field('status', $status, $post_id);
}

add_action('acf/save_post', 'my_acf_save_post', 5);

From my understanding, this should detect if the value for the ‘zip’ field is different from the stored one and change the ‘status’ value. But even when I changed the ‘zip’ field value and saved the post, the ‘status’ still remains ‘unchanged’. Is there something in my logic that doesn’t make sense?