$query_string = array();

Kan iemand vertellen wat er fout is in deze code i.v.m. nieuwe php?
<?php
$query_string = array();
while (list($key,$value) = each (${"HTTP_".$REQUEST_METHOD."_VARS"})) $query_string[] = $key.'='.$value;
$query_string = join('&',$query_string);

echo <<<END
<iframe name=content src="/modules/cms/content.php?$query_string" width=100% height=100% frameborder=0 allowTransparency="true" noresize scrolling="Auto"></iframe>
END;
?>