PHP通过URL获取文件大小

 function getFileSize($url){ ?????????$url = parse_url($url); ????????if($fp = @fsockopen($url[‘host‘],empty($url[‘port‘])?80:$url[‘port‘],$error)){ ?????????fputs($fp,"GET ".(empty($url[‘path‘])?‘/‘:$url[‘path‘])." HTTP/1.1\r\n"); ?????????fputs($fp,"Host:$url[host]\r\n\r\n"); ?????????while(!feof($fp)){ ??????????$tmp = fgets($fp); ??????????if(trim($tmp) == ‘‘){ ???????????break; ??????????}else if(preg_match(‘/Content-Length:(.*)/si‘,$tmp,$arr)){ ???????????return trim($arr[1]); ??????????} ?????????} ?????????return null; ????????}else{ ?????????return null; ????????} ???????}