$cont = explode( '|', $params['continue'] );
$this->dieContinueUsageIf( count( $cont ) != 2 );
$op = $params['dir'] == 'descending' ? '<' : '>';
$cont = explode( '|', $params['continue'] );
$this->dieContinueUsageIf( count( $cont ) != 2 );
$op = $params['dir'] == 'descending' ? '<' : '>';