链接的语句

mysql主机             用户名     用户的密码    数据库的名字

地址

<?php                     ↑          ↑      ↑        ↑
$con = mysql_connect("localhost","peter","abc123","tast");
if (!$con){die('Could not connect: ' . mysql_error());}// some code?> 　　例子：

<?phprequire_once 'application/view.php';class LoginController {

    public function main($vars=array()){        switch ($vars["action"]){            case "loginAction":$this->loginAction($vars);break;//登录        }    }

    public function loginAction($vars=array()) {        $userName = $vars["user_phone"];        $userPassword = $vars["userPassword"];

       $con = mysqli_connect("localhost","root","","tast");    ""表示没有设置密码       if( !$con ) {           die('Could not connect: ' . mysql_error());       }       $ccc=array();       $apple="select * from ppp;"; →  是MYSQL的查询语句       $banana=mysqli_query($con,$apple);                  （$con是链接数据库的钥匙）       while($row = mysqli_fetch_array($banana)){//            var_dump($row);           $ccc[]= $row;       }//        var_dump($a) ;        $ASB=false;       for ($i=0;$i<count($ccc);$i++){            $a=$ccc[$i]["ppp_id"];            $b=$ccc[$i]["ppp_title"];//             var_dump($a);    测试函数的//             var_dump($b);            if($userName==$a){                 if($userPassword==$b){                  $ASB=true;                }//                 else{//                     $view = new View("/application/view/pc/login.php");//                     echo "<script>alert('神知道你错了啥？')</script>";// //                     $view->assign("info","请输入正确的用户名和密码");//                 }            } //             else{//                 $view = new View("/application/view/pc/login.php");//                 echo "请输入账号和密码！！";//             }       }       if($ASB==false){            if($userName==''){                if($userPassword==''){//                $view = new View("/application/view/pc/login.php");               echo '<script language="javascript">alert("请注册账号！");window.history.back();</script>';               exit();                                                          ↓               }                                                            （非常好用，直接跳转到登录页面。）

           }if($userName==''){               echo '<script language="javascript">alert("账号不能为空！");window.history.back();</script>';               exit();

           }if($userPassword==''){               echo '<script language="javascript">alert("密码不能为空！");window.history.back();</script>';

           }if($userName==$a){               if($userPassword!=$b)               {               echo '<script language="javascript">alert("请输入正确密码！");window.history.back();</script>';               exit();               }           }

       }else{          echo"登录成功";        }

    }}?>