!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ko" lang="ko">
head>
title>Cross-Browser QRCode generator for Javascript/title>
meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
script type="text/javascript" src="jquery.min.js">/script>
script type="text/javascript" src="qrcode.js">/script>
/head>
body>
button class="suning">点击/button>
script type="text/javascript">
$(".suning").click(function(){
$.ajax({
url: 'headers.php',
data: {'key':'123'},//如果需要字符串json方式，请使用JSON.stringify(setting.data)
type: 'POST',
//dataType: 'json',
//contentType: 'application/json',
//processData: true,//为true不会序列化数据
beforeSend: function () {
// layer.load(2);
},
headers: {
"token":'token7758521'//自定义token及值
},
success: function (responseData) {
console.log(responseData);
},
error: function (error) {
console.log(error);
}
});
});
/script>
/body>

?php
$arr = get_getallheaders();//获取http头数组
//echo $arr["Token"];//输出Token
var_dump($arr);//输出整个数组
function get_getallheaders() //定义方法
{ 
 foreach ($_SERVER as $name => $value) //循环_SERVER数组
 { 
 if (substr($name, 0, 5) == 'HTTP_') //前5个字符是HTTP_的进入循环
 { 
 $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value; 
 //注释
 //substr($name, 5)，从$name第5个字符向后截取
 //str_replace('_', ' ',)下划线替换成空格
 //strtolower()全部转换为小写
 //ucwords()首字母转换为大写
 //str_replace(' ', '-',)所有空格替换为-
 } 
 } 
 return $headers; //返回前key前5个字符是HTTP_的数组
 //return $_SERVER; //返回_SERVER数组
} 

array(11) {
 ["Cookie"]=>
 string(94) "Hm_lvt_f62fa14829605f0d29c05da9c30e045a=1503649309,1503884728; _ga=GA1.1.1091059248.1504832863"
 ["Accept-Language"]=>
 string(14) "zh-CN,zh;q=0.8"
 ["Accept-Encoding"]=>
 string(17) "gzip, deflate, br"
 ["Referer"]=>
 string(62) "http://localhost/DianNaoBengKuiFangYunDuan/qrcode/headers.html"
 ["Token"]=>//自定义token及值
 string(12) "token7758521"
 ["X-Requested-With"]=>
 string(14) "XMLHttpRequest"
 ["Accept"]=>
 string(3) "*/*"
 ["User-Agent"]=>
 string(110) "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36"
 ["Origin"]=>
 string(16) "http://localhost"
 ["Connection"]=>
 string(5) "close"
 ["Host"]=>
 string(9) "localhost"
}

["HTTP_COOKIE"]=>
 string(94) "Hm_lvt_f62fa14829605f0d29c05da9c30e045a=1503649309,1503884728; _ga=GA1.1.1091059248.1504832863"
 ["HTTP_ACCEPT_LANGUAGE"]=>
 string(14) "zh-CN,zh;q=0.8"
 ["HTTP_ACCEPT_ENCODING"]=>
 string(17) "gzip, deflate, br"
 ["HTTP_REFERER"]=>
 string(62) "http://localhost/DianNaoBengKuiFangYunDuan/qrcode/headers.html"
 ["HTTP_TOKEN"]=>//自定义token及值
 string(12) "token7758521"
 ["HTTP_X_REQUESTED_WITH"]=>
 string(14) "XMLHttpRequest"
 ["HTTP_ACCEPT"]=>
 string(3) "*/*"
 ["HTTP_USER_AGENT"]=>
 string(110) "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36"
 ["HTTP_ORIGIN"]=>
 string(16) "http://localhost"
 ["CONTENT_LENGTH"]=>
 string(1) "7"
 ["HTTP_CONNECTION"]=>
 string(5) "close"
 ["HTTP_HOST"]=>
 string(9) "localhost"