如何使用cURL从googlecode获取远程文件的文件大小? [英] How to get a file size of remote file from googlecode with cURL?
问题描述
我正在尝试使用cURL来获取远程文件 compiler-latest.zip(googlecode.com)的文件大小,而无需实际下载它,这是我的PHP代码:
I am trying to get a file size of remote file "compiler-latest.zip" (googlecode.com) using cURL without actually downloading it, here is my PHP code:
$url = 'http://closure-compiler.googlecode.com/files/compiler-latest.zip';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // optional
curl_setopt($ch, CURLOPT_MAXREDIRS, 10); // optional
curl_setopt($ch, CURLOPT_TIMEOUT, 60); // optional
$result = curl_exec($ch);
$filesize = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
curl_close($ch);
print 'Filesize: ' . $filesize . '<br><br>';
print_r($result);
但是,我的文件大小(1379字节)为 HTTP / 1.1 404未找到状态错误404文档的内容。
因此,如果我设置(CURLOPT_NOBODY,0),它将下载文件并返回其正确的文件大小(当前为3820320字节)。我的问题是如何在不下载的情况下获取正确大小的 compiler-latest.zip文件?
But, I get "HTTP/1.1 404 Not Found" status with a file size (1379 bytes) of this error 404 document. So, if I set (CURLOPT_NOBODY, 0) it downloads file and returns its correct file size (currently 3820320 bytes). My question is how to get a correct file size of "compiler-latest.zip" file without downloading it?
重要提示:此代码可与外部任何其他url正常工作
IMPORTANT: this code works as expected with any other url outside of googlecode.com.
推荐答案
使用 get_headers 函数:
<?php
$headers = get_headers('http://closure-compiler.googlecode.com/files/compiler-latest.zip');
$content_length = -1;
foreach ($headers as $h)
{
preg_match('/Content-Length: (\d+)/', $h, $m);
if (isset($m[1]))
{
$content_length = (int)$m[1];
break;
}
}
echo $content_length;
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