Re: [PHP-DEV] Tie'ing variables

I wanted to do this for some time, but until recently, it wasn't very 
feasible, because the order of registration could be designated by the user 
(gpc_order, variables_order, etc.).  Now that register_globals is off by 
default, and that we have the auto-globals, it's much more feasible.

I implemented this optimization in CVS, so far only for $_ENV and 
$_SERVER.  This alone pushed nearly-empty-page req/sec pages from about 285 
to about 400 on my Windows box.  I'll look into fixing the other ones later.

Pre-requisites for this optimization to kick in:
1.  register_globals being off
2.  register_long_arrays (HTTP_*_VARS) being off

If you want to benchmark w/ vs. w/o, you can disable the optimization by 
initializing cb to 0 in php_startup_auto_globals() and jit_initialization 
to 0 in php_hash_environment(), both in main/php_variables.c.

Zeev

At 18:26 01/03/2003, Sterling Hughes wrote:
>Hi,
>
>Analyzing PHP's routines a bit, it seems that the slowest part of a
>"generic" request is populating the special arrays, $_ENV, $_GET, etc.
>
>I was wondering if it might be possible to "tie" these arrays to a
>function (if you don't understand that, look at Perl for a definition).
>One could populate them as an overloaded object, and then array accesses
>would work - I guess.  But I would prefer a cleaner mechanism.
>
>This would prevent a costly overhead for elements that don't really need
>to be there, and yield only a slight performance cost when accessing
>overloaded elements in these arrays.
>
>-Sterling
>
>--
>"The computer programmer is a creator of universes for which he
>  alone is responsible. Universes of virtually unlimited complexity
>  can be created in the form of computer programs."
>     - Joseph Weizenbaum
>
>
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