去除url中参数，保留干净Url

<?php

function clear_urlcan($url){

    $rstr='';

    $tmparr=parse_url($url);

    $rstr=empty($tmparr['scheme'])?'https://':$tmparr['scheme'].'://';

    $rstr.=$tmparr['host'].$tmparr['path'];

    return $rstr;

}

?>