函数|文件大小|远程文件|header
php获取远程文件大小及信息的函数(header头信息获取)
阿里西西Alixixi.com开发团队在做一个客户系统时，需要做远程下载的功能，并实时显示进度条效果。
所以，需要预先读取远程文件的大小信息，然后做为实时下载进度条的参数。
功能函数如下，调用很简单，getFileSize("http://www.alixixi.com/download/xml.rar") ，就可以获取远程文件的大小了。
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以下是引用片段： function getFileSize($url){ $url = parse_url($url); if($fp = @fsockopen($url[’host’],empty($url[’port’])?80:$url[’port’],$error)){ fputs($fp,"GET ".(empty($url[’path’])?’/’:$url[’path’])." HTTP/1.1\r\n"); fputs($fp,"Host:$url[host]\r\n\r\n"); while(!feof($fp)){ $tmp = fgets($fp); if(trim($tmp) == ’’){ break; }else if(preg_match(’/Content-Length:(.*)/si’,$tmp,$arr)){ return trim($arr[1]); } } return null; }else{ return null; } } echo getFileSize("http://www.alixixi.com/download/xml.rar") ?> |
此函数获取远程文件大小的效果非常好，无论远程文件体积有多大，获取速度完全不受影响。
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