500内部服务器错误PHP

Question

我试图创建一个简单的用户登录系统，但我得到内部服务器错误500。 我查了一下，在我的服务器端，似乎没事。 请检查我的编码中是否有任何错误谢谢:)

<?php
include("config.php");
session_start();
ini_set('display_errors', 1);
if($_SERVER["REQUEST_METHOD"] == "POST") {
  // username and password sent from form 
    $name = $_POST['username']);
    $ssn  = $_POST['password']); 
    $query = "SELECT * FROM Login WHERE Username = '$name' and Password = 
    '$ssn'";
    $result = mssql_query($query,$conn);
    $num = mssql_num_rows($result);
    if($num == 1){
    echo "Succesfully Logged in"
                 }
    else{
         echo "INVALID";
    }            

    ?>

CONFIG.PHP

   <?php
    $serverName = '';  
    $uid = '';   
    $pwd = '';  
    $databaseName = ''; 
    $connectionInfo = array( "UID"=>$uid,                            
                     "PWD"=>$pwd,                            
                     "Database"=>$databaseName); 

    $conn = sqlsrv_connect( $serverName, $connectionInfo);
    if( $conn ) {
          echo "Connection established.<br />";
    }else{
          echo "Connection could not be established.<br />";
     die( print_r( sqlsrv_errors(), true));
        }
        ?>