On Wed, 2010-05-26 at 16:39 -0700, Bob Palowoda wrote:
> What are the advantages or disadvantages of using 64bit php vs 32?
Interesting question.
The obvious thing is that if you're running PHP on a 32 or 64 bit server
as module (for whatever reason) PHP has to match. If you intend to use a
module linking against a library only available with 32 or 64 bit PHP
obviously has to match.
That aside a few things which came to my mind, probably not complete,
though:
* On 64bit internal data structures are larger, for instance PHP's
"zval" type which represents a PHP variable is 16 bytes on 32bit
and 24 bytes on 64bit so every variable in the script is a bit
bigger which can sum up to notable effects
* The max integer value a PHP script can use depends on C's long
type, so arithmetics with larger numbers require 64 bit. A 32
bit machine will cast do double values or have an integer
overflow (depending on the operation in the PHP script) sooner.
* PHP on 32 bit can only access files up to 2GB. This limitation
doesn't exist with 64 bit.
hope that helps in some way.
johannes
--
Johannes Schlüter - MySQL Engineering Connectors and Client Connectivity
Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten
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