On 17 sep. 2012, at 10:55, Frank Arensmeier <[email protected]> wrote:
> 17 sep 2012 kl. 10.50 skrev Camilo Sperberg:
>
>> Hello list, I have a little question with PHP's internal working. I've
>> managed to reduce the test to the following lines:
>>
>> $globalVariable = 'i am a global variable';
>> function testFunction() {
>> global $globalVariable;
>> unset($globalVariable);
>> }
>>
>> testFunction();
>>
>> if(isset($globalVariable)) {
>> var_dump('global variable IS set');
>> } else {
>> var_dump('global variable is NOT set');
>> }
>>
>>
>>
>> When executing the above test, you will get printed that the global variable
>> is set, despite unsetting it in the function. Is it really the intention to
>> unset a global variable inside a function locally or have I just happen to
>> found a little bug?
>>
>> unreal4u-MBP:~ unreal4u$ php --version
>> PHP 5.3.13 with Suhosin-Patch (cli) (built: Jun 20 2012 17:05:20)
>> Copyright (c) 1997-2012 The PHP Group
>> Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies
>> with Xdebug v2.3.0dev, Copyright (c) 2002-2012, by Derick Rethans
>>
>> If it is expected behavior, is there any documentation on why this is done
>> this way?
>>
>> Greetings and thanks.
>> --
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>>
> Sometimes, it helps reading the manual...
>
> http://lmgtfy.com/?q=php+unset+global
>
> "If a globalized variable is unset() inside of a function, only the local
> variable is destroyed. The variable in the calling environment will retain
> the same value as before unset() was called."
> [...]
> "To unset() a global variable inside of a function, then use the$GLOBALS
> array to do so:"
>
> Took about 1 minute to find out.
>
> /frank
Doh! Only thing I can say is that I tried searching but without any relevant
terms… Thanks and also thanks to Simon!
Greetings.
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