PHP 获取完整 URL

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function GetCurUrl(){ 
    $url='http://'; 
    if(isset($_SERVER['HTTPS'])&&$_SERVER['HTTPS']=='on'){ 
        $url='https://'; 
    } 
    if($_SERVER['SERVER_PORT']!='80'){ 
        $url.=$_SERVER['HTTP_HOST'].':'.$_SERVER['SERVER_PORT'].$_SERVER['REQUEST_URI']; 
    }else{ 
        $url.=$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']; 
    } 
    return $url; 
}