PHP：检查网址是否重定向？ [英] PHP: Check if URL redirects?

问题描述

我已经实现了一个功能，在每个页面上运行，我想限制从非登录用户。在用户未登录的情况下，该函数会自动将访问者重定向到登录页面。

I have implemented a function that runs on each page that I want to restrict from non-logged in users. The function automatically redirects the visitor to the login page in the case of he or she is not logged in.

我想创建一个从exernal服务器，并通过多个设置的URL（具有每个受保护站点的URL的数组）进行迭代，以查看它们是否被重定向。

I would like to make a PHP function that is run from a exernal server and iterates through a number of set URLs (array with URLs that is for each protected site) to see if they are redirected or not. Thereby I could easily make sure if protection is up and running on every page.

如何做到这一点？

谢谢。

推荐答案

$urls = array(
    'http://www.apple.com/imac',
    'http://www.google.com/'
);

$ch = curl_init();

curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

foreach($urls as $url) {
    curl_setopt($ch, CURLOPT_URL, $url);
    $out = curl_exec($ch);

    // line endings is the wonkiest piece of this whole thing
    $out = str_replace("\r", "", $out);

    // only look at the headers
    $headers_end = strpos($out, "\n\n");
    if( $headers_end !== false ) { 
        $out = substr($out, 0, $headers_end);
    }   

    $headers = explode("\n", $out);
    foreach($headers as $header) {
        if( substr($header, 0, 10) == "Location: " ) { 
            $target = substr($header, 10);

            echo "[$url] redirects to [$target]<br>";
            continue 2;
        }   
    }   

    echo "[$url] does not redirect<br>";
}

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