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/")
?>
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2、使用file_get_contents()
| 代码如下 |
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$file = file_get_contents($url);
echo strlen($file);
?>
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3. 使用get_headers()
| 代码如下 |
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$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 $size;
?>
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4.curl
| 代码如下 |
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function remote_filesize($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;
}
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