PHP

<?php

session_start();

$codeT = strtoupper(trim($_POST['codeT']));//接收前端传来的数据，转换成大写

    

    $raw_success = array('codeT' => 1, 'msg' => '验证码正确');

    

    $raw_fail = array('codeT' => 2, 'msg' => '验证码错误');

    

    $res_success = json_encode($raw_success);

    $res_fail = json_encode($raw_fail);

 

 

    

    header('Content-Type:application/json');//这个类型声明非常关键

 

echo '$codeT : '.$codeT.'<br>';

echo '$_SESSION["sessionCode"]) : '.$_SESSION["sessionCode"].'<br>';

    if ($codeT == $_SESSION["sessionCode"]) {

        echo $res_success;

    } else {

        echo $res_fail;

    }

?>