PHP isset() 函数的 WordPress 问题

Question

所有这些代码都写在同一页上

 <form method="post" action = "http://mypage.lhosting.info/login/" >
    <p> Username: <input type="text" name = "username" /> </p><br>
    <p> Password: <input type="text" name = "password" /></p> <br>
    <input type="submit" name="submit" value="Register" />
 </form>

 if(isset($_POST['submit']) && !empty($_POST['submit'])) 
 {
   $username = mysqli_real_escape_string($conn, $_POST['username']);
   $password = mysqli_real_escape_string($conn, $_POST['password']);
   $sql = "INSERT INTO Duomenys (Username, Password) VALUES ('$username','$password')"; 
 }

if(isset($_POST['submit']) && !empty($_POST['submit'])) 不会触发，它会在我每次刷新页面时将帐户的详细信息发送到我的数据库。我究竟做错了什么？

注：还在学习PHP和WordPress

Answer 1

$_POST['submit'] 将始终 set 且 不为空 它的值已设置为 Register.

您需要检查 username 和 password 不应为空。因此写

if(!empty($_POST['username']) && !empty($_POST['password'])){
    // querycode here
}

PHP isset() 函数的 WordPress 问题

PHP WordPress issue with isset() Function

php

wordpress

forms

post

isset