下面是我的部分代码：

function fetchOne($sql,$result_type=MYSQLI_ASSOC){//ASSOC返回关联词组
    $link=mysqli_connect(DB_HOST,DB_USER,DB_PWD) or die("数据库链接失败Error:".mysqli_errno().":".mysqli_errno());
    mysqli_set_charset($link,DB_CHARSET);
    mysqli_select_db($link,DB_DBNAME) or die("指定数据库打开失败");
    $result=mysqli_query($link,$sql);
    if (!$result) {
        //return bace;
        printf("Error: %s\n", mysqli_error($link));
        exit();
    }
    $row=mysqli_fetch_array($result,$result_type);
    return $row;
}

<?php
require_once '../include.php';
$username=$_POST['username'];
$password=$_POST['password'];
//$password=md5($_POST['password']);
$verify=$_POST['verify'];
$verify1=$_SESSION['verify'];
//$autoFlag=$_POST['autoFlag'];
if($verify==$verify1){
    $sql="select * from MFY_admin where username='{$username}' and password='{$password}'";
    /* $row=checkAdmin($sql);
    var_dump($row); */
    $res = checkAdmin($sql);
    var_dump($res);
   // if($row){
        //如果选了一周内自动登陆
        /* if($autoFlag){
            setcookie("adminId",$row['id'],time()+7*24*3600);
            setcookie("adminName",$row["username"],time()+7*24*3600);
        } */
      /*   $_SESSION['adminName']=$row['username'];
        $_SESSION['adminId']=$row['id'];
         alertMes("登陆成功", "index.php");
    }else{
        alertMes("登陆失败，重新登陆", "login.php");

    } */
}else{
    alertMes("验证码错误，重新登陆", "login.php");
}