Is there a way to automatically unset a variable after accessing in php?

Question

I am trying to display success or failure messages using session variables. I want them to be unset once the session variable once it is accessed. Is there some kind of PHP configuration where I can do it automatically with out writing any extra code?

I want something like this:

$_SESSION['message'] = 'print success';
echo $_SESSION['message'];
unset($_SESSION['message'])// I want this to be done automatically.

Could somebody help me with this?

@Fred-ii- can you please provide me some sample code as i am new to php ? — Jason, Nov 20 '16 at 20:14
@Samay i just wanted to do it only a particular varaible. the exact requirement is like displaying messages which should expire after once they have been displayed :) — Jason, Nov 20 '16 at 20:17
@Samay `session_destroy()` destroys all data registered to a session — Aniket Sahrawat, Nov 20 '16 at 20:17
There's an example of a ternary operator in here http://php.net/manual/en/language.operators.comparison.php — Funk Forty Niner, Nov 20 '16 at 20:19
@Jason - What you did in the code seems to work file. You have to unset it using the unset() function. You may write a generic function for the same.. — Samay, Nov 20 '16 at 20:19
Possible duplicate of [How to delete a key and return the value from a PHP array?](http://stackoverflow.com/questions/10898699/how-to-delete-a-key-and-return-the-value-from-a-php-array) — Tala, Nov 20 '16 at 20:24
@Dagon wiriting a line is not an issue, but i wanted to make it reusable and efficient :) — Jason, Nov 20 '16 at 20:35

score 2 · Accepted Answer · answered Nov 20 '16 at 20:21

2

You can write your own session handler and have a custom method for that. I strongly suggest Illuminate/Session, though, and use it's flash feature which keeps items in flash bag for the duration of one request only.

class Session {
   public function read($str){
      return isset($_SESSION[$str]) ? $this->deleteAndRet($str) : null;
   }
   protected function deleteAndRet($str){
      $ret = $_SESSION[$str];
      unset($_SESSION[$str]);
      return $ret;
   }
}

answered Nov 20 '16 at 20:21

Tala

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so, anyway i should call some function right or is it going to be excecuted automatically ? – Jason Nov 20 '16 at 20:23
instead of `echo $_SESSION['message'];` you should then call `echo $session->read('message');` where `$session` is an instance of `Session` class. or you could define those methods as static and use `Session::read('message')` instead. – Tala Nov 20 '16 at 20:27
"unset($_SESSION['message'])// I want this to be done automatically." thats not automatic now is it ;-) – Nov 20 '16 at 20:37

Is there a way to automatically unset a variable after accessing in php?

1 Answers1