终于找到了合适的插件，终于可以贴代码了。
随便贴一段表示庆祝。
<?php
require_once "functions.php";
$userName = $_POST["name"];
$passWord = $_POST["password"];
$ssid = $_POST["ssid"];
session_start();
if(validateUser($userName,$passWord,$DB_CONFIG)){
$_SESSION["auth"] = true;
echo "set true";
}
?>
<html>
<body>
<?php if($_SESSION["auth"] == true){echo "Authed" . "<br>";} else {echo "Unauth"."<br>";} ?>
<?php echo $userName;?><br>
<?php echo $passWord;?><br>
<?php echo session_id()?><br>
</body>
</html>