我已经浏览过互联网，但无法找到并理解所提供的任何解决方案。
基本上，我创建（或者更确切地说是从 Internet 复制了一些脚本）并尝试使用这些脚本来制作注册页面。我正在使用 PHP、Mysql 和 XAMPP。连接已经很好了。我在基本表单等上测试了一些数据输入。
但我的问题是，在我弄乱了脚本之后，我设法将数据插入到表中（peekdoordb）......所有的散列和验证表单都工作了......除了那个，即使有数据，表单也会继续将数据提交到数据库中错误或该字段为空。在我再次搞砸之后，问题就出现了。错误出现在“ $stmt->bindValue(':name', $name);”
我在浏览器上不断收到此错误；
注意：未定义变量：第 194 行 C:\xampp\htdocs\eventsite\TMP1kjqc3x.php 中的 stmt
和
致命错误：在第 194 行的 C:\xampp\htdocs\eventsite\TMP1kjqc3x.php 中的非对象上调用成员函数 bindValue()
registration.php（注册页面）包括两个文件，即connect.php和password.php，但我从来没有把这两个文件弄乱过，因为在此之前，只能提交数据，问题出在表单上，数据不断插入就像我之前提到的那样。但现在的主要问题是关于这个错误。
<?php
//register.php
/**
* Start the session.
*/
session_start();
//Include password_compat library.
require 'lib/password.php';
//Include MySQL connection.
require 'connect.php';
//define variables and define to null.
$nameError = $telnoError = $usernameError = $passwordError ="";
$name = $telno = $username = $pass = "";
//Retrieve the field values from registration form.
$name = !empty($_POST ['name']) ? trim($_POST['name']) : null ;
$telno = !empty ($_POST ['telno']) ? trim($_POST['telno']) : null;
$username = !empty($_POST['username']) ? trim($_POST['username']) : null;
$pass = !empty($_POST['password']) ? trim($_POST['password']) : null;
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
$formValid = true; // Boolean - Set to true b4 validating
//If the POST var "register" exists ( the submit button), then I can
//assume that the user has submitted the registration form.
if(isset($_POST['register'])){
//TO ADD: Error checking (username characters, password length, etc).
//Basically, you will need to add your own error checking BEFORE
//the prepared statement is built and executed.
//Now, we need to check if the supplied username already exists.
//Construct the SQL statement and prepare it.
if (empty($_POST["name"])) {
$nameError = "Name is required";
}else {
$name = test_input($_POST["name"]);
// check name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameError = "Only letters and white space allowed";
}
}
if (empty($_POST["telno"])) {
$telnoError = "Tel number is required";
} else {
$telno = test_input($_POST["telno"]);
// check if e-mail address syntax is valid or not
if (!preg_match("/^[a-zA-Z ]*$/",$telno)) {
$telnoError = "Invalid tel no format";
}
}
if (empty($_POST["username"])) {
$usernameError = "username is required";
} else {
$username = test_input($_POST["username"]);
// check name only contains letters and email syntax
if (!preg_match("/^[a-zA-Z ]*$/",$username)) {
$usernameError = "Only letters and email syntax required";
}
}
if (empty($_POST["password"])) {
$passwordError = "passworde is required";
} else {
$pass = test_input($_POST["password"]);
// check name only contains letters and email syntax
if (!preg_match("/^[a-zA-Z ]*$/",$pass)) {
$passwordError = "Only password letter syntax";
}
}
//*******************************************************************
$sql = "SELECT COUNT(username) AS num FROM users WHERE username = :username";
$stmt = $pdo->prepare($sql);
//Bind the provided username to our prepared statement.
$stmt->bindValue(':username', $username);
//Execute.
$stmt->execute();
//Fetch the row.
$row = $stmt->fetch(PDO::FETCH_ASSOC);
//If the provided username already exists - display error.
//TO ADD - Your own method of handling this error. For example purposes,
//I'm just going to kill the script completely, as error handling is outside
//the scope of this tutorial.
if($row['num'] > 0){
die('That username already exists!');
}
//Hash the password as we do NOT want to store our passwords in plain text.
$passwordHash = password_hash($pass, PASSWORD_BCRYPT, array("cost" => 12));
}
//If the signup process is successful.
elseif($formValid){
//******************************ppppp
//Bind our variables.
$stmt->bindValue(':name', $name);
$stmt->bindValue(':telno', $telno);
$stmt->bindValue(':username', $username);
$stmt->bindValue(':password', $passwordHash);
$stmt = $pdo->prepare($sql);
//Prepare our INSERT statement.
//Remember: We are inserting a new row into our users table.
$sql = "INSERT INTO users (name, telno, username, password) VALUES (:name, :telno, :username, :password)";
//Execute the statement and insert the new account.
$result = $stmt->execute();
//What you do here is up to you!
echo 'Thank you for registering with our website.';
}
else {
die('something wrong!');
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Register</title>
<style type="text/css">
.lucida {
font-family: "MS Serif", "New York", serif;
}
body form table {
font-weight: bold;
}
</style>
</head>
<body>
<h1> </h1>
<h1> </h1>
<h1 align="center"> Register</h1>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post">
<div align="center">
<table width="800" border="0">
<tr>
<td width="404" class="lucida"><div align="right">Name :</div></td>
<td width="386"><input class="input" name="name" type="text" value="<?PHP print $name ; ?>">
<span class="error">* <?php echo $nameError;?></span></td>
</tr>
<tr>
<td class="lucida"><div align="right">Contact Number :</div></td>
<td><input class="input" name="telno" type="text" value="<?PHP print $telno ; ?>">
<span class="error">* <?php echo $telnoError;?></span></td>
</tr>
<tr>
<td class="lucida"><div align="right">Email (Username) :</div></td>
<td><input class="input" name="username" type="text" value="<?PHP print $username ; ?>">
<span class="error">* <?php echo $usernameError;?></span></td>
</tr>
<tr>
<td class="lucida"><div align="right">Password :</div></td>
<td><input class="input" name="password" type="text" value="">
<span class="error">* <?php echo $passwordError;?></span></td>
</tr>
<tr>
<td class="lucida"><div align="right"></div></td>
<td> </td>
</tr>
<tr>
<td><div align="right"></div></td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td><div align="right"></div></td>
<td> </td>
</tr>
</table>
<input type="submit" name="register" value="Register">
<br>
</div>
</button>
</form>
</body>
</html>