这个问题中的一些代码可能有点长，所以我会尝试查明我认为问题所在。我遇到的一个问题是我不确定如何判断代码失败的地方。我所拥有的只是它加载或不加载。现在它只是没有任何理由地加载。
首先，我将显示我的表单代码：
function show_form($messages) {
// Assign post values if exist
$username="";
$password="";
$firstname="";
$lastname="";
$address="";
$city="";
$state="";
$zip="";
$phone="";
$card_number="";
$expire="";
$code="";
$product_name="";
if (isset($_POST["username"]))
$username=$_POST["username"];
if (isset($_POST["password"]))
$password=$_POST["password"];
if (isset($_POST["firstname"]))
$firstname=$_POST["firstname"];
if (isset($_POST["lastname"]))
$lastname=$_POST["lastname"];
if (isset($_POST["address"]))
$address=$_POST["address"];
if (isset($_POST["city"]))
$city=$_POST["city"];
if (isset($_POST["state"]))
$state=$_POST["state"];
if (isset($_POST["zip"]))
$zip=$_POST["zip"];
if (isset($_POST["phone"]))
$phone=$_POST["phone"];
if (isset($_POST["card_number"]))
$card_number=$_POST["card_number"];
if (isset($_POST["expire"]))
$expire=$_POST["expire"];
if (isset($_POST["code"]))
$code=$_POST["code"];
if (isset($_POST["product_name"]))
$product_name=$_POST["product_name"];
echo "<p></p>";
echo "<h2> Enter New Customers Data</h2>";
echo "<p></p>";
?>
<h5>Complete the information in the form below and click Submit to create your account. All fields are required.</h5>
<form name="createstudent" method="POST" action="InsertApp.php">
Username:<br>
<input type="text" name="username" value=""><br>
Last name:<br>
<input type="text" name="password" value=""><br>
Street Address:<br>
<input type="text" name="address" value=""><br>
First name:<br>
<input type="text" name="firstname" value=""><br>
Last name:<br>
<input type="text" name="lastname" value=""><br>
Street Address:<br>
<input type="text" name="address" value=""><br>
City:<br>
<input type="text" name="city" value=""><br>
<br>
<select name="state" size="1">
<option value="AK">AK</option>
<option value="AL">AL</option>
<option value="AR">AR</option>
<option value="AZ">AZ</option>
<option value="WV">WV</option>
<option value="WY">WY</option>
</select>
<br>
<br>
Zipcode:<br>
<input type="text" name="zip" value=""><br><br>
<input type="radio" name="credit_card" value="visa" checked> Visa<br>
<input type="radio" name="credit_card" value="master"> MasterCard<br>
<input type="radio" name="credit_card" value="american"> American Express<br>
<input type="radio" name="credit_card" value="discover"> Discover<br>
<input type="radio" name="credit_card" value="paypal"> Pay Pal<br><br>
Phone Number:<br>
<input type="text" name="phone" valur""><br>
Credit Card Number:<br>
<input type="text" name="card_number" value=""><br>
Expiration Date (Mon/Year):<br>
<input type="text" name="expire" value=""><br>
Security Code:<br>
<input type="text" name="code" value=""><br><br>
<input type="submit" value="Submit">
</form>
我对上面的代码从来没有问题，我只是提供它来向您展示我正在使用的内容。接下来，我将向您展示我添加的一些代码，这些代码稍后会给我带来问题。我知道我应该一次只做一点点，但我搞砸了。
<?php
function validate_form()
{
$messages = array();
$redisplay = false;
// Assign values
$username = $_POST["username"];
$password = $_POST["password"];
$firstname = $_POST["firstname"];
$lastname = $_POST["lastname"];
$address = $_POST["address"];
$city = $_POST["state"];
$state = $_POST["state"];
$zip = $_POST["zip"];
$phone = $_POST["phone"];
$card_number = $_POST["card_number"];
$expire = $_POST["expire"];
$code = $_POST["code"];
$product_name = $_POST["product_name"];
$customer = new CustomerClass($username,$password,$firstname,$lastname,$address,$city,$state,$zip,$phone,$card_number,$expire,$code,$product_name);
$count = countCostumer($customer);
// Check for accounts that already exist and Do insert
if ($count==0)
{
$res = insertCustomer($customer);
echo "<h3>Thank you for shopping with us!</h3> ";
}
else
{
echo "<h3>A customer account with that username already exists.</h3> ";
}
}
function countCustomer ($customer)
{
// Connect to the database
$mysqli = connectdb();
$firstname = $customer->getFirstname();
$lastname = $customer->getLastname();
$username = $->getUsername();
// Connect to the database
$mysqli = connectdb();
// Define the Query
// For Windows MYSQL String is case insensitive
$Myquery = "SELECT count(*) as count from Customer
where username='$username'";
if ($result = $mysqli->query($Myquery))
{
/* Fetch the results of the query */
while( $row = $result->fetch_assoc() )
{
$count=$row["count"];
}
/* Destroy the result set and free the memory used for it */
$result->close();
}
$mysqli->close();
return $count;
}
function insertCustomer ($customer)
{
// Connect to the database
$mysqli = connectdb();
$firstname = $customer->getFirstname();
$lastname = $customer->getLastname();
$username = $->getUsername();
// Add Prepared Statement
$Query = "INSERT INTO Customer
(username,password,firstName,lastName,address,city,state,zip,phone,card_number,expire,code,product_name)
VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)";
$stmt = $mysqli->prepare($Query);
$stmt->bind_param("sssssssiiiiis", $username, $password, $firstname, $lastname, $city, $state, $zip, $phone, $card_number, $expire, $code, $product_name);
$stmt->execute();
$stmt->close();
$mysqli->close();
return true;
}
我知道这是很多代码可以在那里寻求帮助，但我无法找到查明错误的方法。如果有人知道任何地方，我可以把这段代码放在显示可能有帮助的错误。我尝试使用 W3C 验证。但是，它告诉我我不能在非公共领域使用它。
下面是更多代码：
class StudentClass
{
// property declaration
private $username="";
private $password="";
private $firstname="";
private $lastname="";
private $address="";
private $city="";
private $state="";
private $zip="";
private $phone="";
private $card_number="";
private $expire="";
private $code="";
private $product_name="";
// Constructor
public function __construct($username,$password,$firstname,$lastname,$address,$city,$state,$zip,$phone,$card_number,$expire,$code,$product_name)
{
$this->username = $username;
$this->password = $password;
$this->firstname = $firstname;
$this->lastname = $lastname;
$this->address = $address;
$this->city = $city;
$this->state = $state;
$this->zip = $zip;
$this->phone = $phone;
$this->card_number = $card_number;
$this->expire = $expire;
$this->code = $code;
$this->product_name = $product_name;
}
// Get methods
public function getUsername ()
{
return $this->username;
}
public function getPassword ()
{
return $this->password;
}
public function getFirstname ()
{
return $this->firstname;
}
public function getLastname ()
{
return $this->lastname;
}
public function getAddress ()
{
return $this->address;
}
public function getCity ()
{
return $this->city;
}
public function getState ()
{
return $this->state;
}
public function getZip ()
{
return $this->zip;
}
public function getPhone ()
{
return $this->phone;
}
public function getCardNumber ()
{
return $this->card_number;
}
public function getExpire ()
{
return $this->expire;
}
public function getCode ()
{
return $this->code;
}
public function getProductName ()
{
return $this->product_name;
}
// Set methods
public function setusername ($value)
{
$this->username = $value;
}
public function setPassword ($value)
{
$this->password = $value;
}
public function setFirstname ($value)
{
$this->firstname = $value;
}
public function setLastname ($value)
{
$this->lastname = $value;
}
public function setAddress ($value)
{
$this->address = $value;
}
public function setCity ($value)
{
$this->city = $value;
}
public function setState ($value)
{
$this->state = $value;
}
public function setZip ($value)
{
$this->zip = $value;
}
public function setPhone ($value)
{
$this->phone = $value;
}
public function setCardNumber ($value)
{
$this->card_number = $value;
}
public function setExpire ($value)
{
$this->Expire = $value;
}
public function setCode ($value)
{
$this->code = $value;
}
public function setProductName ($value)
{
$this->product_name = $value;
}
} // End Studentclass
?>
任何帮助或见解将不胜感激。谢谢
首先要排除故障的几件事：
如果要打开error_reporting（这是确定是否存在语法错误的最简单方法），可以在此处找到有关该错误的信息。
在文本的第二个简介中，您有两个情况似乎缺少单词customer而是输入了$->getUsername()，而在第三个简介中，它可能只是一个复制的flub，但没有前导<?php标签。
如果您对安装 IDE 或语法检查器不感兴趣，您可以随时从命令行运行 php -l 或在文件上运行 php_check_syntax。只是一些值得深思的东西。