Question

在下面的類中，我需要kill（）來終止類中正在進行的任何操作，並且停止所有和類中的所有進程，而不是腳本：

<?php 
class email { 
    //Expressions 
    const exp_name  = "/^[A-Za-z .'-]+$/"; 
    const exp_email  = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/'; 
    const error   = "We are sorry, but there appears to be a problem with the form you submitted.<br/>"; 
    private $msg  = 'Thank you for subscribing'; 
    protected $status = true; 


    function __construct() { 
     self::validate(); 
     echo '<br/>the CLASS continued</b><br/>'; 
    } 


    private function validate() { 
     //Empty fields 
     foreach ($_REQUEST as $key => $value) { 
      $val = str_replace(' ', '', $value); 
      if ($val === '') { 
       self::error('empty', $key); 
       self::kill(); //If empty, this should end the loop and class 
      } //if:empty 
     } //foreach 


     //Validate Name 
     if(!preg_match(self::exp_name,$_POST['Name'])) { 
      self::error('name'); 
      self::kill(); //kill 


     //Validate e-Mail 
     if(!preg_match(self::exp_email,$_POST['e-Mail'])) { 
      self::error('email'); 
      self::kill(); //kill 
     } 
    } 


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

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


    private function error($type = null, $value = null) { 
     switch($type) { 
      case 'empty': 
      $this->msg = self::error . "<div class='error'><b>The following field is empty: </b>" . $value . "</div>"; 
      self::set(false); 
      break; 

      case 'name': 
      $this->msg = self::error . "<div class='error'><b>The First Name you entered does not appear to be valid.</b></div>"; 
      self::set(false); 
      break; 

      case 'email': 
      $this->msg = self::error . "<div class='error'><b>The e-Mail you entered does not appear to be valid.</b></div>"; 
      self::set(false); 
      break; 

      default: 
      self::set(false); 
      $this->msg = self::error; 
     } 
    return; //kill app 
    } 


    private function set($boolean = false) { 
     $this->status = $boolean; 
    } 


    private function kill() { 
     //die(); 
     //exit($this); 
     //exit(); 
     //return; 
     //break; 
    } 
} 


$email = new email(); 
echo $email->msg(); 
echo '<br/>'; 
echo '<br/>'; 
echo 'The script continued!!!'; 
?> 

Answer 1

正如上面在評論中回答的，嘗試使用「try」和「catch」塊。

更改 「驗證」 方法

private function valdidate($type = null, $value = null) { 
    // Anything that is going wrong: 
    throw new Exception("Your error message"); 
} 

類外：

try { 
     $mail = new email(); 
} catch (Exception $e) { 
     echo $e->getMessage(); // Handle the message properly here. 
} 

有關異常的詳細信息，請參閱：

http://php.net/manual/en/language.exceptions.php

Answer 2

而不是self::kill();只需使用return;

如果需要kill做其他的東西，然後只需使用return self::kill();當你需要調用它，改變kill到：

private function kill() { 
    doStuff(); 
    return; 
} 

Answer 3

沒有人阻止你只是回報validate方法，然後設置一個簡單的布爾if/else塊來評估其結果。

private function validate() { 
    //Empty fields 
    foreach ($_REQUEST as $key => $value) { 
     $val = str_replace(' ', '', $value); 
     if ($val === '') { 
      // You shouldn't call staticaly 
      // self::error('empty', $key); 
      $this->error('empty', $key); 
      // self::kill(); //If empty, this should end the loop and class 
      return false; 
     } //if:empty 
    } //foreach 


    //Validate Name 
    if(!preg_match(self::exp_name,$_POST['Name'])) { 
     $this->error('name'); 
     return false; 
    } 

    //Validate e-Mail 
    if(!preg_match(self::exp_email,$_POST['e-Mail'])) { 
     $this->error('email'); 
     return false; 
    } 

    return true; 
} 

然後在構造函數中：

if ($this->validate()) { 
    echo '<br/>the CLASS continued</b><br/>'; 
} 

Answer 4

如果我理解正確此相反kill()可以使用return false。據我所知，return會拋出方法外，並且執行不會受到任何影響。如果我沒有正確理解你的問題，請聯繫我。

最好的問候！

Answer 5

問題在於班級中沒有「殺了我」選項。 PHP使用unset方法來銷燬變量，並且不能從類中調用該變量。正如手冊所述'自PHP 5以來，不可能在對象方法中取消設置$'，所以你不能殺死你的類。

這就是說，你會如何去做，然後確保什麼也沒有發生時，它不驗證？確保你檢查了不應該繼續出錯的每個類的方法中的狀態。下面你會發現你的代碼被改變來顯示這個過程。請務必閱讀關於我爲什麼做了什麼的評論。

<?php 
class email { 
    //Expressions 
    const exp_name  = "/^[A-Za-z .'-]+$/"; 
    const exp_email  = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/'; 
    const error   = "We are sorry, but there appears to be a problem with the form you submitted.<br/>"; 
    private $msg  = 'Thank you for subscribing'; 
    protected $status = true; 


    function __construct() { 
     //first check if it validates. 
     //if it doesnt, end the constructor so the "class continued" line won't show. 
     if (!self::validate()) { 
      return; 
     } 


     echo '<br/>the CLASS continued</b><br/>'; 
    } 


    private function validate() { 
     //have the validate method return true/false. 
     //Now you can use the output of this method to stop the script if needed 

     //Empty fields 
     foreach ($_REQUEST as $key => $value) { 
      $val = str_replace(' ', '', $value); 
      if ($val === '') { 
       self::error('empty', $key); 
       return false; //just return false when it doesnt validate 
      } //if:empty 
     } //foreach 


     //Validate Name 
     if(!preg_match(self::exp_name,$_POST['Name'])) { 
      self::error('name'); 
      return false; //just return false when it doesnt validate 
     } 

     //Validate e-Mail 
     if(!preg_match(self::exp_email,$_POST['e-Mail'])) { 
      self::error('email'); 
      return false; //just return false when it doesnt validate 
     } 

     //else return true 
     return true; 
    } 

    public function status() { 
     //always allow the script to return the status 
     return $this->status; 
    } 

    public function msg() { 
     //always allow the script to return the error message 
     return $this->msg; 
    } 

    //example function on how to make sure nothing happens on error 
    public function send() {  
     //return false on error so the rest method is not executed 
     if ($this->status!==true) 
      return false; 

     //else continue 
     echo "I'm sending an email!"; 
     //mail(.....) 
    } 


    private function error($type = null, $value = null) {  
     //you set the status to false here, so you can use it to check if an error occured 
     //since you always set it to false, remove it from the switch statement. 
     //This way there is less duplicate code and thus less chance for errors 

     self::set(false); 

     switch($type) { 
      case 'empty': 
       $this->msg = self::error . "<div class='error'><b>The following field is empty: </b>" . $value . "</div>"; 
       break; 

      case 'name': 
       $this->msg = self::error . "<div class='error'><b>The First Name you entered does not appear to be valid.</b></div>"; 
       break; 

      case 'email': 
       $this->msg = self::error . "<div class='error'><b>The e-Mail you entered does not appear to be valid.</b></div>"; 
       break; 

      default: 
       $this->msg = self::error; 
     } 

     return; 
    } 


    private function set($boolean = false) { 
     //use a check to set the value to make sure its always a boolean 
     //this way it will be false unless you actually set it to true. 
     $this->status = ($boolean===true); 
    } 
} 


$email = new email(); 

//now you can do a check for the message and only continue if there was no error 
if ($email->status() !== false) { 
    //Do whatever you want with the e-mail 
    $email->send(); 
    echo 'An e-mail has been sent!'; 
} else { 
    echo 'Something was wrong with the email ('.$email->msg().')'; 
} 

//or another approach could be to directly send it and catch if there was an error 
//make sure to check for false with === to be sure its realy a boolean. 
//If you would just check with == the method would also fail if the send() method would return 0 for instance 
if ($email->send() === false) { 
    echo 'Something was wrong with the email ('.$email->msg().')'; 
} 

//but no matter what, the script will continue 
echo '<br/>'; 
echo '<br/>'; 
echo 'And the script continued!!!'; 
?> 

Answer 6

你可以做到這一點編程方式是這樣的：

class email { 
    //Expressions 
    public static $errorOccuredInCurrentRun = false; 

    const exp_name = "/^[A-Za-z .'-]+$/"; 
    const exp_email = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/'; 
    const error = "We are sorry, but there appears to be a problem with the form you submitted.<br/>"; 

    private $msg = 'Thank you for subscribing'; 
    protected $status = true; 

    public static function factory(){ 
     //du your validation 
     self::$errorOccuredInCurrentRun = false; 
     self::validate(); 
     if(!self::$errorOccuredInCurrentRun){ 
      return new Email(); 
     }else{ 
      return null; 
     } 
    } 

    private function __construct() { 
     echo '<br/>the CLASS continued</b><br/>'; 
    } 

    private static function validate() { 
     //Empty fields 
     foreach ($_REQUEST as $key => $value) { 
      if(self::$errorOccuredInCurrentRun){ 
       break; 
      } 
      $val = str_replace(' ', '', $value); 
      if ($val === '') { 
       self::error('empty', $key); 
       self::kill(); //If empty, this should end the loop and class 
      } //if:empty 
     } //foreach 
     //Validate Name 
     if(self::$errorOccuredInCurrentRun){ 
      if (!preg_match(self::exp_name, $_POST['Name'])) { 
       self::error('name'); 
       self::kill(); //kill 
       //Validate e-Mail 
       if(self::$errorOccuredInCurrentRun){ 
        if (!preg_match(self::exp_email, $_POST['e-Mail'])) { 
         self::error('email'); 
         self::kill(); //kill 
        } 
       } 
      } 
     } 
    } 

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

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

    private function error($type = null, $value = null) { 
     switch ($type) { 
      case 'empty': 
       $this->msg = self::error . "<div class='error'><b>The following field is empty: </b>" . $value . "</div>"; 
       self::set(false); 
       break; 

      case 'name': 
       $this->msg = self::error . "<div class='error'><b>The First Name you entered does not appear to be valid.</b></div>"; 
       self::set(false); 
       break; 

      case 'email': 
       $this->msg = self::error . "<div class='error'><b>The e-Mail you entered does not appear to be valid.</b></div>"; 
       self::set(false); 
       break; 

      default: 
       self::set(false); 
       $this->msg = self::error; 
     } 
     return; //kill app 
    } 

    private function set($boolean = false) { 
     $this->status = $boolean; 
    } 

    private function kill() { 
     self::$validationRunCompleted; 
    } 

} 

，然後用它這樣的：

$email = email::factory(); 
if(is_null($email)){ 
    //something went wrong 
}else{ 
    //validation was fine 
} 

如果當前的「運行」沒有，我只執行的東西任何錯誤。只有在沒有錯誤的情況下，您才能獲得電子郵件對象本身，並執行您所需要的操作。