<?php
session_start();
header("Content-type:text/html;charset=utf-8");
$link = mysqli_connect('localhost','123654lgh', 'etjyr2bm','123654lgh');
if (!$link) {
die("连接失败:".mysqli_connect_error());
}
$sql = "select * from login";
$result = mysqli_query($link, $sql);
$rows = mysqli_fetch_array($result);
$username = $_POST['username'];
$password = $_POST['password'] ;
$confirm = $_POST['confirm'];
$email = $_POST['email'];
if($username == "" || $password == "" || $ bestätigen == "" ||. $email == "")
if ((strlen($username) < 3)||(!preg_match('/^w+$/i', $username)))
{
echo "<script>alert('信息不能为空！重新填写');window.location.href='zhuce.html'</script>";
} elseif ((strlen($username ) < 3)||(!preg_match('/^w+$/i', $username))) {
echo "<script>alert('用户名至少3位且不含非法字符！重新填写');window.location.href='zhuce'</script>";
//判断用户名长度
}elseif(strlen($password) < 5){
echo "<script> Alert('密码至少5位！重新填写');window.location.href='zhuce.html'</script>";
//判断密码长度
}elseif($password != $confirm) {
echo "<script>alert('两次密码不相同！重新填写');window.location.href='zhuce.html'</script>";
//检测两次输入密码是否相同
} elseif (!preg_match('/^[w.]+@w+.w+$/i', $email))
echo "<script>alert('邮箱不合法！重新填写') ;window.location.href='zhuce.html'</script>";
//判断邮箱格式是否合法
elseif(mysqli_fetch_array(mysqli_query($link,"select * from login where username = '$username '"))){
echo "<script>alert('用户名已存在');window.location.href='zhuce.html'</script>";
} else{
$ sql= "in die Anmeldung einfügen(Benutzername, Passwort, Bestätigung, E-Mail)Werte('$Benutzername','$Passwort','$Bestätigen','$E-Mail')";
//插入数据库
if(! (mysqli_query($link,$sql))){
echo "<script>alert('Dateneinfügung fehlgeschlagen');window.location.href='zhuce.html'";
}else{
echo "<script>alert('Registrierung erfolgreich'); window.location.href='yonghu.html'</script>";
}
}
?>
这是客户端的提示，你页面上用表单提交了，然后你刷新就会有的提示，不是的代码报错问题