如何使用cURL获取目标网址？

Question

当HTTP状态代码为302时,如何使用cURL获取目标URL？

<?PHP
$url = "http://www.ecs.soton.ac.uk/news/";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$html = curl_exec($ch);
$status_code = curl_getinfo($ch,CURLINFO_HTTP_CODE);

if($status_code=302 or $status_code=301){
  $url = "";
  // I want to to get the destination url
}
curl_close($ch);
?>

Answer 1

您可以使用:

echo curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);

Answer 2

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HEADER, TRUE); // We'll parse redirect url from header.
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, FALSE); // We want to just get redirect url but not to follow it.
$response = curl_exec($ch);
preg_match_all('/^Location:(.*)$/mi', $response, $matches);
curl_close($ch);
echo !empty($matches[1]) ? trim($matches[1][0]) : 'No redirect found';

Answer 3

有点过时的回复,但想要展示一个完整的工作示例,其中一些解决方案是:

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url); //set url
    curl_setopt($ch, CURLOPT_HEADER, true); //get header
    curl_setopt($ch, CURLOPT_NOBODY, true); //do not include response body
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //do not show in browser the response
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); //follow any redirects
    curl_exec($ch);
    $new_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL); //extract the url from the header response
    curl_close($ch);

这适用于任何重定向,例如301或302,但是在404上它只返回请求的原始URL(因为它没有找到).这可用于更新或删除您网站的链接.无论如何,这是我的需要.

Answer 4

您必须获取重定向URL 的Location标头.