无法将数据连接到 MySQL

Question

当我单击提交按钮时，我似乎无法找出为什么我的 PHP 代码不允许我将信息存储在 MySQL 中。有人可以告诉我下面的代码有什么问题吗？

我想让用户提交他们的注册表单并且他们的信息可以转移到 MySQL 数据库中。然后，我希望将用户带到我的 index.html 文件。

感谢任何帮助。 谢谢

<?php 

$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$mysql_database = "21st";
$conn = mysqli_connect($dbhost, $dbuser, $dbpass) or die("Could not connect database");
        mysqli_select_db($conn, $mysql_database) or die("Could not select database");

$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];
$password2 = $_POST['password2'];

if ($password == $password2)    {
        $sql = "INSERT INTO members (username, email, password) VALUES ('$userrname','$email','$password')";
} else  {
    echo "Your passwords must match";
}
?>

Answer 1

尝试使用mysqli_query 实际运行查询。当您设置$sql 时，所做的只是为查询设置了一个名为$sql 的变量。另请注意，您在查询中设置了变量$userrname，它应该是$username，正如上面直接的$_POST 设置的那样。我调整后的代码版本如下：

$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$mysql_database = "21st";

$conn = mysqli_connect($dbhost, $dbuser, $dbpass) or die("Could not connect database");
mysqli_select_db($conn, $mysql_database) or die("Could not select database");

$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];
$password2 = $_POST['password2'];

if ($password === $password2) {

  // Set the query.
  $sql = "INSERT INTO members (username, email, password)"
       . " VALUES (?, ?, ?)"
       ;

  // Bind the values to the query.
  mysqli_stmt_bind_param($sql, 'sss', $username, $email, $password);

  // Run the query.
  mysqli_query($conn, $sql);

  // Free the result set.
  mysqli_free_result($sql);

  // Close the connection.
  mysqli_close($conn);

}
else {
  echo "Your passwords must match";
}