What are the indicators of an HTTP redirection and how can it be detected in PHP?

When a website performs an HTTP redirection, it typically sends a status code of 301 or 302 along with a Location header that specifies the new URL. To detect an HTTP redirection in PHP, you can check the status code using the get_headers() function or by inspecting the response headers using cURL. 

$url = 'http://www.example.com';

$headers = get_headers($url, 1);

if (strpos($headers[0], '301') !== false || strpos($headers[0], '302') !== false) {
    $newUrl = $headers['Location'];
    echo 'Redirected to: ' . $newUrl;
}

Keywords

HTTP redirection detection PHP headers status codes

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