Get file size remotely

    /**
    *  远程获取文件大小
    */
    function getFileSize($url){
        $url = parse_url($url);//返回url组成部分关联数组
        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;
        }
    }

The above introduces the remote acquisition of file size, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.