Parsed: 109056

  public function __construct( $screen, $columns = array() ) {
    if ( is_string( $screen ) ) {
      $screen = convert_to_screen( $screen );
    }

    $this->_screen = $screen;

    if ( ! empty( $columns ) ) {
      $this->_columns = $columns;
      add_filter( 'manage_' . $screen->id . '_columns', array( $this, 'get_columns' )  <, 0 );
    }
  }