如何获取请求的header头信息

方式1:获取$_SERVER;  //NGINX获取
方式2:通过apache_request_headers()函数获取; //APACHE获取
$header = apache_request_headers();
$Auth = $header['Authorization'];
示例:
if(function_exists('apache_request_headers')){
    $header = apache_request_headers();
    $Auth = $header['Authorization'];
}else{
    $Auth = $_SERVER['HTTP_AUTHORIZATION'];
}