php - 无法使用 PHP 将数据插入我的 MySQL 数据库

Question

我正在创建一个音乐网站，用户应该可以在其中将艺术家、专辑和歌曲添加到数据库并进行讨论。但是，我无法将用户输入注册表单的数据传输到数据库中的“用户”表。我不太确定出了什么问题，但我怀疑这是我的语法问题，因为我没有任何数据库连接问题。我一直在寻找几个小时，但我还没有找到解决方案。谁能帮帮我？

澄清一下:错误是在用户点击“提交”后，注册表单中的任何信息都没有输入到我的数据库中

注册.php:

<?php include 'header.php'; ?>

<form class="form" action="register.php" method="POST">
  <fieldset>
    <label for="firstName">First Name:</label>
    <input type="text" name="firstName" placeholder="John Smith">
    <br>
    <label for="lastName">Last Name:</label>
    <input type="text" name="lastName" placeholder="John Smith">
    <br>
    <label for="email">Email:</label>
    <input type="email" name="email" value="some@one.com">
    <br>
    <label for="username">Username:</label>
    <input type="text" name="username" value="helloitsme">
    <br>
    <label for="password">Password:</label>
    <input type="password" name="password">
    <br>
    <label for="confirmPassword">Confirm Password:</label>
    <input type="password" name="confirmPassword">
    <br>
    <label for="age">Age:</label>
    <input type="number" name="age">
    <br>
  </fieldset>
  <fieldset>
    <input type="submit" name="submit" value="Register">
  </fieldset>
</form>

注册.php:

<?php
session_start();

if ($_POST["password"] != $_POST["confirmPassword"]) {
  $_SESSION['signUpBadPassword'] = true;
  header('Location: signup.php');
}
// Re use connection stuffs
include "db.php";
// get connection
$conn = DB::connect();

$stmt = $conn->prepare("INSERT INTO users (firstName, lastName, email, username, password, age) VALUES (?, ?, ?, ?, ?, ?)");

$stmt->bind_param(
  "sssssi",
  $_POST["firstName"],
  $_POST["lastName"],
  $_POST["email"],
  $_POST["username"],
  $_POST["password"],
  $_POST["age"]
);

$stmt->execute();

// Close the connection
$conn->close();
header('Location: index.php');

 ?>

和 db.php:

<?php

class DB
{

  public static function connect()
  {
    $hostname = 'localhost';
    $username = 'user';
    $password = 'password';
    $dbName = 'dbname';
    $connection = new mysqli($hostname, $username, $password, $dbName);

  if ($connection->connect_error) {
     die('Failed to connect');
   }

  return $connection;
  }
}

Answer 1

绑定(bind)参数时请检查是否设置了 post 值，即检查以下代码:

$stmt = $conn->prepare("INSERT INTO users (firstName, lastName, email, username, password, age) VALUES (?, ?, ?, ?, ?, ?)");

$stmt->bind_param(
  "sssssi", $firstName, $lastName, $email, $userName, $passWord, $age
);

//check firstname is set or not
if(isset($_POST['firstName']))
{
    $firstName= $_POST['firstName'];    
}
else
{
    $firstName= NULL;
} 
//check lastname is set or not
if(isset($_POST['lastName']))
{
    $lastName= $_POST['lastName'];  
}
else
{
    $lastName= NULL;
} 
//check email is set or not
if(isset($_POST['email']))
{
    $email= $_POST['email'];    
}
else
{
    $email= NULL;
} 
//check username is set or not
if(isset($_POST['username']))
{
    $userName= $_POST['username'];  
}
else
{
    $userName= NULL;
} 
//check password is set or not
if(isset($_POST['password']))
{
    $passWord= $_POST['password'];  
}
else
{
    $passWord= NULL;
} 
//check age is set or not
if(isset($_POST['age']))
{
    $age= $_POST['age'];    
}
else
{
    $age= 0;
}