如何确定URL是否在PHP中重定向？

Question

我看到有人问一个关于检测URL是否从groovy和perl重定向但在PHP上找不到任何内容的问题.

任何人都知道某处我可以找到这样做的代码？

Answer 1

$ch = curl_init('http://www.yahoo.com/');
curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if (($code == 301) || ($code == 302)) {
  //This was a redirect
}

Answer 2

实际上,我发现这个效果最好:

    function GetURL($URL)
    {
            $ch = curl_init($URL);

            curl_setopt($ch,CURLOPT_FOLLOWLOCATION,true);


            curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);

            curl_exec($ch);

            $code = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);

            curl_close($ch);

            return $code;
    }