PHP 获取远程文件大小

Posted 2021-05-15

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";
}