php获取全部的头信息

getallheaders()

foreach (getallheaders() as $name => $value) {
    echo "$name: $value\n";
}

if (!function_exists('getallheaders'))
{
    function getallheaders()
    {
           $headers = [];
       foreach ($_SERVER as $name => $value)
       {
           if (substr($name, 0, 5) == 'HTTP_')
           {
               $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
           }
       }
       return $headers;
    }
}