PHP开发登录注册完整代码之登录PHP页面

创建login.php文件

此页面完成的功能如下

1.jpg

代码如下


<?php
session_start();
header("Content-type:text/html;charset=utf-8");
$link = mysqli_connect('localhost','root','root','login');  //链接数据库
mysqli_set_charset($link ,'utf8'); //设定字符集 
$name=$_POST['username'];
$pwd=$_POST['password'];
$yzm=$_POST['yzm'];
    if($name==''){
        echo "<script>alert('请输入用户名');location='" . $_SERVER['HTTP_REFERER'] . "'</script>";
        exit;
    }
    if($pwd==''){
        echo "<script>alert('请输入密码');location='" . $_SERVER['HTTP_REFERER'] . "'</script>";
        exit;
    }
    if($yzm!=$_SESSION['VCODE']){
        echo"<script>alert('你的验证码不正确,请重新输入');location='".$_SERVER['HTTP_REFERER']. "'</script>";
        exit;
    }
    $sql_select="select id,username,password from user where username= ?";      //从数据库查询信息
    $stmt=mysqli_prepare($link,$sql_select);
    mysqli_stmt_bind_param($stmt,'s',$name);
    mysqli_stmt_execute($stmt);
    $result=mysqli_stmt_get_result($stmt);
    $row=mysqli_fetch_assoc($result);
    if($row){
        if($pwd !=$row['password'] || $name !=$row['username']){
            echo "<script>alert('密码错误,请重新输入');location='login.html'</script>";
            exit;
        }
        else{
            $_SESSION['username']=$row['username'];
            $_SESSION['id']=$row['id'];
            echo "<script>alert('登录成功');location='first.html'</script>";
        }
    }else{
        echo "<script>alert('您输入的用户名不存在');location='login.html'</script>";
        exit;
    };



继续学习
<?php session_start(); header("Content-type:text/html;charset=utf-8"); $link = mysqli_connect('localhost','root','root','login');//链接数据库 mysqli_set_charset($link,'utf8'); //设定字符集 $name=$_POST['username']; $pwd=$_POST['password']; $yzm=$_POST['yzm']; $hadden=$_POST['hadden']; if($hadden=="hadden"){ if($name==''){ echo "<script>alert('请输入用户名');location='" . $_SERVER['HTTP_REFERER'] . "'</script>"; exit; } if($pwd==''){ echo "<script>alert('请输入密码');location='" . $_SERVER['HTTP_REFERER'] . "'</script>"; exit; } if($yzm!=$_SESSION['VCODE']){ echo"<script>alert('你的验证码不正确,请重新输入');location='".$_SERVER['HTTP_REFERER']. "'</script>"; exit; } } $sql_select="select id,username,password from user where username= ?"; //从数据库查询信息 $stmt=mysqli_prepare($link,$sql_select); mysqli_stmt_bind_param($stmt,'s',$name); mysqli_stmt_execute($stmt); $result=mysqli_stmt_get_result($stmt); $row=mysqli_fetch_assoc($result); if($row){ if($pwd !=$row['password'] || $name !=$row['username']){ echo "<script>alert('密码错误,请重新输入');location='login.html'</script>"; exit; } else{ $_SESSION['username']=$row['username']; $_SESSION['id']=$row['id']; echo "<script>alert('登录成功');location='first.html'</script>"; } }else{ echo "<script>alert('您输入的用户名不存在');location='login.html'</script>"; exit; };
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