php获取远程图片体积大小的实例_php实例

直接看代码吧，很好明白的

//用法 echo remote_filesize($url,$user='',$pw='');<BR>$url = "http://www.aa.com/librarys/images/random/rand_11.jpg";//这里要换成你的图片地址<BR>echo remote_filesize($url,$user='',$pw='');</P><P>function remote_filesize($uri,$user='',$pw='')<BR>{<BR>// start output buffering<BR>    ob_start();<BR>// initialize curl with given uri<BR>    $ch = curl_init($uri); // make sure we get the header<BR>    curl_setopt($ch, CURLOPT<strong style="color:transparent">￥本文来源gaodai#ma#com搞@@代~&码网^</strong><small>搞gaodaima代码</small>_HEADER, 1); // make it a http HEAD request<BR>    curl_setopt($ch, CURLOPT_NOBODY, 1); // if auth is needed, do it here<BR>    if (!empty($user) && !empty($pw))<BR>    {<BR>        $headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw));<BR>        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);<BR>    }<BR>    $okay = curl_exec($ch);<BR>    curl_close($ch); // get the output buffer<BR>    $head = ob_get_contents(); // clean the output buffer and return to previous // buffer settings<BR>    ob_end_clean();  // gets you the numeric value from the Content-Length // field in the http header<BR>    $regex = '/Content-Length:\s([0-9].+?)\s/';<BR>    $count = preg_match($regex, $head, $matches);  // if there was a Content-Length field, its value // will now be in $matches[1]<BR>    if (isset($matches[1]))<BR>    {<BR>        $size = $matches[1];<BR>    }<BR>    else<BR>    {<BR>        $size = 'unknown';<BR>    }<BR>    $last_mb = round($size/(1024*1024),3);<BR> $last_kb = round($size/1024,3);<BR>    return $last_kb . 'KB / ' . $last_mb.' MB';<BR>}<BR>

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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