Re: [PHP4BETA] unset and global behavior problems.

This is a known difference;  The definition for unset() in PHP 4.0, and
its behavior, are much more consistent than that of PHP 3.0, and it is a
bit different when it comes to global variables.  unset() deletes a symbol
from the symbol table, or in other words, erases a given variable.  In PHP
4.0, when you define 'global $var;', you essentially ask for the local
$var to point to the global $var (they're reference to each other).
unset()ing the local $var symbol will not affect the global $var.

To unset() a global in PHP 4.0, use unset($GLOBALS["varname"]).

Zeev

On Fri, 19 May 2000, Andrew A. Neuschwander wrote:

> 
> While working with the sourceforge php code, I can across this behavioral
> difference between php 3 and 4. I wanted to know if this is an intended
> change or not.  The following script does very different things in the two
> versions.
> 
> <?php
> function thing() {
>   global $var;
>   unset($var);
>   $var = "Simpson"; 
> }
> $var = "Homer";
> echo "$var<br>";
> thing();
> echo "$var<br>";
> ?>
> 
> In php3 the output is :
> 
> Homer
> Simpson
> 
> In php4 the output is :
> 
> Homer
> Homer
> 
> Is this change a bug or intentional? 
> 
> Thanks,
> Andrew N.
> [email protected]
> [email protected]
> 
> 
> 

-- 
Zeev Suraski <[email protected]>
http://www.zend.com/