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. > drender@bigsky.net > andrew@neuschwander.org > > > -- Zeev Suraski <zeev@zend.com> http://www.zend.com/