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Re: Will this set or get a SESSION variable?

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Thomas 'PointedEars' Lahn wrote:

> David Heller wrote:
>>> > It appears to me that $_SESSION[$name] = " " or
>>> > possibly something else.
>>>
>>> You may check it out for yourself:
>>>
>>> if(in_array($name, $this->m_names))
>>> {
>>> $this->m_rules[$name][] = $rule;
>>> var_dump($_SESSION[$name]);
>>> return $_SESSION[$name];
>>>
>>> }
>>>
>>> If the session is not initialized or the session variable has not been
>>> set before, it will print NULL.
> 
> As with any other PHP array when you use a non-existing key.  There is
> nothing special about $_SESSION here, other than it could have been
> initialized, and the key-value pair could have been added, from session
> data set previously, elsewhere.

Another difference is that apparently the $_SESSION superglobal is *created* 
by session_start():

$ php -r 'var_dump($_SESSION["foo"]);'
PHP Notice:  Undefined variable: _SESSION in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
NULL

$ php -r 'session_start(); var_dump($_SESSION["foo"]);'
PHP Notice:  Undefined index: foo in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
NULL

$ php -r 'var_dump($a["foo"]);'
PHP Notice:  Undefined variable: a in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
NULL

$ php -r '$a = array(); var_dump($a["foo"]);'
PHP Notice:  Undefined index: foo in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
NULL

$ php -r '$a = array("foo" => "bar"); var_dump($a["foo"]);'
string(3) "bar"

$ php -v
PHP 5.3.3-7+squeeze15 with Suhosin-Patch (cli) (built: Mar  4 2013 14:05:25) 
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
    with XCache v1.3.0, Copyright (c) 2005-2009, by mOo
    with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans
    with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH


PointedEars
-- 
Danny Goodman's books are out of date and teach practices that are
positively harmful for cross-browser scripting.
  -- Richard Cornford, cljs, <cife6q$253$1$8300dec7@news.demon.co.uk> (2004)

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Thread

Will this set or get a SESSION variable? David Heller <daveh@allheller.net> - 2013-03-20 15:09 -0700
  Re: Will this set or get a SESSION variable? Christoph Becker <cmbecker69@gmx.de> - 2013-03-20 23:53 +0100
    Re: Will this set or get a SESSION variable? David Heller <daveh@allheller.net> - 2013-03-20 17:14 -0700
      Re: Will this set or get a SESSION variable? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-03-22 15:41 +0100
        Re: Will this set or get a SESSION variable? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-03-22 17:34 +0100
  Re: Will this set or get a SESSION variable? Robert Heller <heller@deepsoft.com> - 2013-03-20 18:39 -0500
    Re: Will this set or get a SESSION variable? Jerry Stuckle <jstucklex@attglobal.net> - 2013-03-20 23:35 -0400
  Re: Will this set or get a SESSION variable? Jerry Stuckle <jstucklex@attglobal.net> - 2013-03-20 23:32 -0400

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