如何用PHP查询远程文件的具体大小？

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phpfunction remote_filesize($url, $user=, $pw=) { ob_start(); $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_NOBODY, 1); if (!empty($user) && !empty($pw)) { $headers=array('Authorization: Basic ' . base64_encode($user . ':' . $pw)); } if (isset($headers)) { curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); } curl_exec($ch); $size=curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD); curl_close($ch); ob_end_clean(); return $size;}

function remote_filesize($url, $user = "", $pw = "") { ob_start(); $ch = curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_NOBODY, 1); if(!empty($user) && !empty($pw)) { $headers = array('Authorization: Basic ' . base64_encode("$user:$pw")); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); } $ok = curl_exec($ch); curl_close($ch); $head = ob_get_contents(); ob_end_clean(); $regex = '/Content-Length:\s([0-9].+?)\s/'; $count = preg_match($regex, $head, $matches); return isset($matches[1]) ? $matches[1] : "unknown"; }
用法：

<?php $file = "koonk.com/images/logo.png"; $size = remote_filesize($url); echo $size; ?>