Hi,
I've read "PHP 4: Reference Counting and Aliasing" By Andi Gutmans on Zend.com site
(http://www.zend.com/zend/art/ref-count.php). Also I read this mail
http://marc.theaimsgroup.com/?l=php-dev&m=100955714924477 from him.
I would like to know more about how reference is managed by PHP4. I'm missing
something like that article (see the first URL) for reference.
What happens inside PHP4 with this code ?
<?
$a = 5;
$b = $a;
$c = &$b;
$d = $c;
?>
How PHP4 know that $c and d are reference to $a and not "counted" like $b ? And so
what makes references so bad ? ;-)
Another (more important) example:
<?
function foo( $msg )
{
$tmp = &$msg;
return $tmp;
}
?>
What happens to $tmp ? If it will not refer to a new memory block why the memory used
by the script is more than without '&' ? (See the second URL).
Thanks.
Ed
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