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php获取远程图片文件大小

时间:2014-07-28 17:51 作者:QQ地带 我要评论

有时候,我们需要知道远程图片的体积大小,那么PHP如何可以做到呢?这里介绍一个函数,先来看看演示:
 
//用法 echo remote_filesize($url,$user='',$pw='');
$url = "http://www.oicqzone.com/templets/images/ad.gif";
echo remote_filesize($url,$user='',$pw='');
 
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 (!empty($user) && !empty($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();  // 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';
    }
    $last_mb = round($size/(1024*1024),3);
    $last_kb = round($size/1024,3);
    return $last_kb . 'KB / ' . $last_mb.' MB';
}
 
程序运行结果:
31.495KB / 0.031 MB
函数的思路是,先CURL获取图片到缓冲区,然后正则获取图片的Content-Length信息就OK了。

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