1、使用file_get_contents()

复制代码 代码如下:

<?php

$file = file_get_contents($url);

echo strlen($file);

?>

2. 使用get_headers()

复制代码 代码如下:

<?php

$header_array = get_headers($url, true);

$size = $header_array['Content-Length'];

echo $size;

?>

PS:

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()

复制代码 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/1.1rn");

fputs($fp, "Host:" . $url['host']. "rnrn");

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;

}

}

?>