Check witch field has been updated

Hi Nicolas,

I think you can hook to rwmb_value like this:

add_filter( 'rwmb_value', 'prefix_check_field_change', 20, 3 );
function prefix_check_field_change( $new, $field, $old ) {
    if ( $new !== $old ) {
        // Log
    }
    return $new; // Do not change the value
}

Hi Nicolas,

You can store the changed fields and then process the log when the post is saved. Here is what I suggest:

class MB_Log {
    protected $fields = array();

    public function __construct() {
        add_filter( 'rwmb_value', array( $this, 'check_field_change' ), 20, 3 );
        add_action( 'rwmb_after_save_post', array( $this, 'log' ) );
    }

    public function check_field_change( $new, $field, $old ) {
        if ( $new !== $old ) {
            $this->fields[] = $field;
        }

        return $new; // Do not change the value
    }

    public function log() {
        foreach ( $this->fields as $field ) {
            // Log
        }
    }
}