PHP开发登录注册完整代码之注册PHP页面

<?php session_start(); header("Content-type:text/html;charset=utf-8"); $link = mysqli_connect('localhost','root','root','login'); mysqli_set_charset($link,'utf8'); //设定字符集 $name=$_POST['name']; $pwd=$_POST['pwd']; $pwdconfirm=$_POST['pwdconfirm']; $yzm=$_POST['yzm']; $hadden=$_POST['hadden']; if($hadden=="hadden"){ if($name==''){ echo"<script>alert('你的用户名不能为空，请重新输入');location='".$_SERVER['HTTP_REFERER']. "'</script>"; exit; } if($pwd==''){ echo"<script>alert('你的密码不能为空，请重新输入');location='".$_SERVER['HTTP_REFERER']. "'</script>"; exit; } if($pwd != $pwdconfirm){ echo"<script>alert('你输入的两次密码不一致，请重新输入');location='".$_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; } $insert_sql="insert into user(username,password)values(? , ? )"; $stmt=mysqli_prepare($link,$insert_sql); mysqli_stmt_bind_param($stmt,'ss',$name,$pwd); $result_insert=mysqli_stmt_execute($stmt); if($result_insert){ echo "<script>alert('您已注册成功，返回登录');location='login.html'</script>"; exit; }else { echo "<script>alert('您输入的用户名已存在,请重新注册！');location='reg.html'</script>"; exit; } } ?>