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
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