PHP 获取远程文件大小的3种解决方法

1、使用file_get_contents()

代码如下:

PHP
$file = file_get_contents($url);
echo strlen($file);
?>

2. 使用get_headers()

代码如下:

PHP
$header_array = get_headers($url,true);
$size = $header_array['Content-Length'];
echo $size;
?>

需要打开allow_url_fopen!

如未打开会显示
Warning: get_headers() [function.get-headers]: URL file-access is disabled in the server configuration

3.使用fsockopen()

代码如下:

PHP
function get_file_size($url) {
$url = parse_url($url); if (empty($url['host'])) {
return false;
} $url['port'] = empty($url['post']) ? 80 : $url['post'];
$url['path'] = empty($url['path']) ? '/' : $url['path']; $fp = fsockopen($url['host'],$url['port'],$error); if($fp) {
fputs($fp,"GET " . $url['path'] . " HTTP/1.1\r\n");
fputs($fp,"Host:" . $url['host']. "\r\n\r\n"); while (!feof($fp)) {
$str = fgets($fp);
if (trim($str) == '') {
break;
}elseif(preg_match('/Content-Length:(.*)/si',$str,$arr)) {
return trim($arr[1]);
}
}
fclose ( $fp);
return false;
}else {
return false;
}
}
?>