php获取远程文件大小的四种方法

get_headers()函数获取远程文件大小

get_headers() 是PHP系统级函数，他返回一个包含有服务器响应一个 HTTP 请求所发送的标头的数组。该数组中有一个值表示远程文件的大小，即Content-Length。

$url='http://www.manongjc.com';

print_r(get_headers($url));

?>

输出结果：

Array

(

[0] => HTTP/1.1 200 OK

[1] => Date: Sat,29 May 2004 12:28:13 GMT

[2] => Server: Apache/1.3.27 (Unix) (Red-Hat/Linux)

[3] => Last-Modified: Wed,08 Jan 2003 23:11:55 GMT

[4] => ETag: "3f80f-1b6-3e1cb03b"

[5] => Accept-Ranges: bytes

[6] => Content-Length: 438

[7] => Connection: close

[8] => Content-Type: text/html

)

fsockopen()方法获取远程文件大小

function getFileSize($url)

{

$url = parse_url($url);

if($fp = @fsockopen($url['host'],emptyempty($url['port'])?80:$url['port'],$error))

{

fputs($fp,"GET ".(emptyempty($url['path'])?'/':$url['path'])." HTTP/1.1rn");

fputs($fp,"Host:$url[host]rnrn");

while(!feof($fp))

{

$tmp = fgets($fp);

if(trim($tmp) == '')

{

break;

}

/* http://www.manongjc.com/article/1378.html */

elseif(preg_match('/Content-Length:(.*)/si',$tmp,$arr))

{

return trim($arr[1]);

}

}

return null;

}

else

{

return null;

}

}

curl获取远程文件大小

curl也还比较方便，还能支持用户验证

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.'<----end
';

// 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;

}

file_get_contents获取远程文件大小

$fCont = file_get_contents("http://www.weiyeying.cn/");

echo strlen($fCont)/1024;

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