php获取远程文件的大小，具体代码如下：
<p>/*</p>**功能:获取远程文件的大小,返回值的单位是:字节<br />*/<br />function get_fileSize($url){<br /> if(!isset($url)||trim($url)==''){<br /> return '';<br /> }<br /> ob_start();<br /> $ch=curl_init($url);<br /> curl_setopt($ch,CURLOPT_HEADER,1);<br /> curl_setopt($ch,CURLOPT_NOBODY,1);<br /> $okay=curl_exec($ch);<br /> curl_close($ch);<br /> $head=ob_get_contents();<br /> ob_end_clean();<br /> $regex='/Content-Length:\s([0-9].+?)\s/';<br /> $count=preg_match($regex,$head,$matches);<br /> return isset($matches[1])&&is_numeric($matches[1])?$matches[1]:'';<br />}
