$bits = wfParseUrl( $params['returnurl'] );
if ( !$bits || $bits['scheme'] === '' ) {
$encParamName = $this->encodeParamName( 'returnurl' );
$bits = wfParseUrl( $params['returnurl'] );
if ( !$bits || $bits['scheme'] === '' ) {
$encParamName = $this->encodeParamName( 'returnurl' );