Bug #55038 [NEW]: inconsistent error-handling for $this

From: Date: Sun, 12 Jun 2011 01:53:58 +0000
Subject: Bug #55038 [NEW]: inconsistent error-handling for $this
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-161337@lists.php.net to get a copy of this message 
From:             
Operating system: Win7
PHP version:      5.3.6
Package:          Class/Object related
Bug Type:         Bug
Bug description:inconsistent error-handling for $this

Description:
------------
$this is not generally allowed outside an object context, but sometimes it
is.

I discovered this while trying to write a cheeky little base-class that
would 
allow you to decorate objects with new methods, at run-time.

I would have gotten away with it, too - and I still could of course, only I
would 
have to break from the convention of $this, and naming the context-object 
something else, which kind of sucks.


Test script:
---------------
<?php

$foo = function($this)
{
  var_dump($this); // this will work!
};

$foo('bar');

// now an object:

class Test
{
  public $foo = 'bar';
}

$test = new Test;

// and another closure:

$ouch = function($this)
{
  var_dump($this->bar); // this will blow up
};

$ouch($test);


Expected result:
----------------
The two examples should either fail consistently, or succeed consistently.

From my point of view, why should I not be allowed to have a local variable
named 
$this if I wanted to? There's nothing special or magical about this
variable, 
besides the fact that it gets automatically assigned on call.


Actual result:
--------------
The second example fails.


-- 
Edit bug report at http://bugs.php.net/bug.php?id=55038&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=55038&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=55038&r=trysnapshot53
Try a snapshot (trunk):              http://bugs.php.net/fix.php?id=55038&r=trysnapshottrunk
Fixed in SVN:                        http://bugs.php.net/fix.php?id=55038&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=55038&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=55038&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=55038&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=55038&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=55038&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=55038&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=55038&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=55038&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=55038&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=55038&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=55038&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=55038&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=55038&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=55038&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=55038&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=55038&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=55038&r=mysqlcfg

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