PHP 获取远程文件大小常用方法总结

php有很多方法可以获取远程文件大小的哦，最常用的就有fsockopen、file_get_contents、curl函数哦，下面我来给各位总结一下。  

1、fsockopen

代码如下

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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/1.1rn"); fputs($fp,"Host:$url[host]rnrn"); 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; } } //调用方法 echo getFileSize("http://www.bkjia.comnet/") ?>

2、使用file_get_contents()

代码如下	复制代码
$file = file_get_contents($url); echo strlen($file); ?>

3. 使用get_headers()

代码如下

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$header_array = get_headers($url, true); //返回结果 Array (     [0] => HTTP/1.1 200 OK     [Date] => Sat, 29 May 2004 12:28:14 GMT     [Server] => Apache/1.3.27 (Unix)  (Red-Hat/Linux)     [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT     [ETag] => "3f80f-1b6-3e1cb03b"     [Accept-Ranges] => bytes     [Content-Length] => 438     [Connection] => close     [Content-Type] => text/html )   $size = $header_array['Content-Length']; echo $size; ?>

4.curl

代码如下

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function remote_filesize($uri,$user='',$pw='') {     // start output buffering     ob_start();     // initialize curl with given uri     $ch = curl_init($uri);     // make sure we get the header     curl_setopt($ch, CURLOPT_HEADER, 1);     // make it a http HEAD request     curl_setopt($ch, CURLOPT_NOBODY, 1);     // if auth is needed, do it here     if (!emptyempty($user) && !emptyempty($pw))     {         $headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw));         curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);     }     $okay = curl_exec($ch);     curl_close($ch);     // get the output buffer     $head = ob_get_contents();     // clean the output buffer and return to previous     // buffer settings     ob_end_clean();       echo ' head-->'.$head.' ';       // gets you the numeric value from the Content-Length     // field in the http header     $regex = '/Content-Length:s([0-9].+?)s/';     $count = preg_match($regex, $head, $matches);       // if there was a Content-Length field, its value     // will now be in $matches[1]     if (isset($matches[1]))     {         $size = $matches[1];     }     else     {         $size = 'unknown';     }     //$last=round($size/(1024*1024),3);     //return $last.' MB';     return $size; }