Get the Headers of Incoming Requests Using PHP

It’s pretty easy to get the headers of incoming requests using PHP. If you’re using Apache, you can simple do something like:

$headers = apache_request_headers();

foreach ($headers as $header => $value) {
    echo "$header: $value <br />\n";
}

If you’re not using Apache, your best bet is to try and extract them from the $_SERVER variable. Something like this would do the trick:

print_r(getHeaders());

function getHeaders()
{
    $headers = array();
    foreach ($_SERVER as $k => $v)
    {
        if (substr($k, 0, 5) == "HTTP_")
        {
            $k = str_replace('_', ' ', substr($k, 5));
            $k = str_replace(' ', '-', ucwords(strtolower($k)));
            $headers[$k] = $v;
        }
    }
    return $headers;
}