How do i check if session_start has been entered?

Question

I have a third party script and was wondering how I can check with PHP if session_start() has been declared before doing something?

Answer 1

best way work for me! if(session_status() != 1) session_start();

Answer 2

function session_started(){ return !!session_id(); }

Answer 3

I suppose you could use the session_id function :

session_id() returns the session id for the current session or the empty string ("") if there is no current session (no current session id exists).

Or maybe testing whether $_SESSION is set or not, with isset, might do the trick, as it should not be set when no session has been started -- you just have to hope that nothing assigns anything to $_SESSION without starting the session first.

Answer 4

As in PHP >= 5.4.0, you have function session_status() that tell you if it have been initialize or not or if it's disabled.

For example you can do:

if (session_status() == PHP_SESSION_NONE) {
  session_start();
}

You can read more about it in http://www.php.net/manual/en/function.session-status.php

Answer 5

I just wrote a simple function for it.

  function isSessionStart ()
  {
    if (version_compare(phpversion(), '5.4.0', '<')) {
      if(session_id() == '') {
        return false;
      }
      return true;
    }
    else {
      if (session_status() == PHP_SESSION_NONE) {
        return false;
      }
      return true;
    }
  }

Answer 6

if(isset($_SESSION)) {
    // do something
}