如何從構造函數方法中返回錯誤PHP

Question

我在嘗試通過OOP方式學習PHP Web開發，並對如何從PHP構造函數方法返回錯誤數組產生疑問。我有一個用戶輸入信息的表單，但是當我檢查他們輸入的數據時，如果他們有錯誤，我希望能夠將其返回到請求它的頁面，以便我可以將它顯示在列表框中在表單上方。我會怎麼做呢？我的代碼如下，並且只是測試代碼，我正在玩PHP來學習我需要在不久的將來構建的網站。謝謝！

與形式的PHP/HTML文件中它：（別擔心，我也會在工作後發佈表單數據的安全性）

<?php if(!isset($_POST['submit'])) { ?> 
**## WANT TO INSERT ERROR LIST HERE IF ANY ERRORS FROM CONSTRUCTOR METHOD ##** 
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" name="form1"> 
    Please Enter a First Name: <input type="text" name="fname" /><br /> 
    Please Enter a Last Name: <input type="text" name="lname" /><br /> 
    Please Enter a Username: <input type="text" name="username" /><br /> 
    Please Enter a Email: <input type="text" name="email" /><br /> 
    Please Enter a Password: <input type="password" name="password" /><br /> 
    <input type="submit" value="Submit" name="submit" /><br /> 
</form> 
<?php 
} 
if (isset($_POST['submit'])) 
{ 
    include_once("classes/User.class.php"); 
    $u = new User($_POST['fname'],$_POST['lname'],$_POST['username'],$_POST['password'],$_POST['email'],"male"); 
    echo "First Name: " . $u->get_first_name() . "<br />"; 
    echo "Last Name: " . $u->get_last_name() . "<br />"; 
    echo "Username: " . $u->get_username() . "<br />"; 
    echo "Email: " . $u->get_email() . "<br />"; 

} 
?> 

以下是創建在那裏我叫新用戶我的類定義我所指的構造方法：

<?php 
class User 
{ 
    private $firstName = ""; 
    private $lastName = ""; 
    private $username = ""; 
    private $password = ""; 
    private $email = ""; 
    private $gender; 
    private $birthday; 
    private $dateJoined; 
    private $lastVisit; 
    private $errors = array(); 

    function __construct($fname,$lname,$username,$password,$email,$gender) 
    { 
     if($this->check_name($fname,$lname)) 
     { 
      $this->firstName = $fname; 
      $this->lastName = $lname; 
     } 
     else 
     { 
      array_push($this->errors,"Please correct your first and last name");  
     } 

     if($this->check_username($username)) 
     { 
      $this->username = $username; 
     } 
     else 
     { 
      array_push($this->errors,"Please choose a username."); 
     } 

     if ($this->check_password($password)) 
     { 
      $this->password = sha1($password); 
     } 
     else 
     { 
      array_push($this->errors,"Passwords must be 7 or more characters"); 
     } 

     $this->email = $email; 
     if($gender) 
     { 
      $this->gender = $gender; 
     } 

     if(!empty($this->errors)) 
     { 
      foreach ($this->errors as $error) { 
       echo $error . "<br />"; 
      } 
      unset($error); 
      exit(); 
     } 
    } 


    //Getter Methods 
    public function get_first_name() 
    { 
     return $this->firstName; 
    } 

    public function get_last_name() 
    { 
     return $this->lastName; 
    } 

    public function get_full_name() 
    { 
     return $this->firstName . " " . $this->lastName; 
    } 

    public function get_email() 
    { 
     return $this->email; 
    } 

    public function get_username() 
    { 
     return $this->username; 
    } 

    public function get_birthday() 
    { 
     if ($this->birthday) 
      return $this->birthday; 
    } 

    public function get_gender() 
    { 
     if ($this->gender) 
      return $this->gender; 
    } 

    public function get_last_visit() 
    { 
     return $this->lastVisit; 
    } 



    //Setter Methods 
    public function set_first_name($fname) 
    { 
     $this->firstName = $fname; 
    } 

    public function set_last_name($lname) 
    { 
     $this->lastName = $lname; 
    } 

    public function set_full_name($fname,$lname) 
    { 
     $this->firstName = $fname; 
     $this->lastName = $lname; 
    } 

    public function set_email($email) 
    { 
     $this->email = $email; 
    } 

    public function set_password($password) 
    { 
     $this->password = sha1($password); 
    } 

    public function set_username($username) 
    { 
     $this->username = $username; 
    } 



    //Private methods 
    private function check_name($fname,$lname) 
    { 
     if($fname == "" || $lname == "") 
      return false; 
     return true; 
    } 

    private function check_username($username) 
    { 
     if($username == "") 
      return false; 
     return true; 
    } 

    private function check_password($password) 
    { 
     if(!isset($_POST['password'])) 
      return false; 
     else if (strlen($password) < 7) 
      return false; 

     return true; 
    } 
} 
?> 

Answer 1

理想情況下，您將使用單獨的類來驗證表單數據。見this post

您還可以添加一個有效的（）方法做用戶類：

function valid(){ 
    return count($this->errors); 
} 

之後，調用必要的核實數據的功能。

$user = new User(...); 
if($user->valid()){ 
    echo 'the information is valid.'; 
}else{ 
    echo 'the information is invalid.'; 
}