PHP file_get_contents忽略超时? [英] PHP file_get_contents ignoring timeout?

问题描述

$url = 'http://a.url/i-know-is-down';

//ini_set('default_socket_timeout', 5);

$ctx = stream_context_create(array(
    'http' => array(
        'timeout' => 5,
        'ignore_errors' => true
        )
    )
);

$start = microtime(true);
$content = @file_get_contents($url, false, $ctx);
$end = microtime(true);
echo $end - $start, "\n";

我得到的响应通常是21.232段，应该不超过5秒钟?

the response I get is generally 21.232 segs, shouldn't be about five seconds???

取消注释ini_set行根本没有帮助.

Uncommenting the ini_set line don't help at all.

推荐答案

您正在使用socket_create_context设置 read 超时.如果您尝试访问的 page 不存在，则服务器将允许您连接并给您404.但是，如果 site 不存在(赢得't解析或在其后面没有Web服务器)，则file_get_contents()将忽略读取超时，因为它甚至还没有超时连接到它.

You are setting the read timeout with socket_create_context. If the page you are trying to access doesn't exist then the server will let you connect and give you a 404. However, if the site doesn't exist (won't resolve or no web server behind it), then file_get_contents() will ignore read timeout because it hasn't even timed out connecting to it yet.

我认为您不能在file_get_contents中设置连接超时.我最近重写了一些使用fsockopen()的代码，正是因为它允许您指定连接超时

I don't think you can set the connection timeout in file_get_contents. I recently rewrote some code to use fsockopen() exactly because it lets you specify connect timeout

$connTimeout = 30 ;
$fp = fsockopen($hostname, $port, $errno, $errstr, $connTimeout);

当然，要转到fsockopen，将需要您从一个循环中依次退出fread()，从而使您的代码稍微复杂些.但是，在使用stream_get_meta_data()

Ofcourse going to fsockopen will require you to then fread() from it in a loop, compicating your code slightly. It does give you more control, however, on detecting read timeouts while reading from it using stream_get_meta_data()

http://php.net/stream_get_meta_data

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