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使用Request
对象的header
方法获取当前请求的HTTP 请求头信息
$info = Request::instance()->header();
echo $info['accept'];
echo $info['accept-encoding'];
echo $info['user-agent'];
直接获取某个请求头信息
$agent = Request::instance()->header('user-agent');
HTTP请求头信息的名称不区分大小写,并且 _
会自动转换为-
,下面写法等效
$agent = Request::instance()->header('user-agent');
$agent = Request::instance()->header('User-Agent');
$agent = Request::instance()->header('USER_AGENT');