> -----Original Message----- > From: th.heuer@xxxxxxxxx [mailto:th.heuer@xxxxxxxxx] On Behalf Of > German Geek > Sent: Thursday, February 05, 2009 5:02 PM > To: tgol@xxxxxxxxxx > Cc: Matt Pagel; php-general@xxxxxxxxxxxxx > Subject: Re: function_exists question > > Why can't you update to Version 5? I might be a bit anal about trying > to > always get the newest version of everything, but seriously version 3 > has > surely more known security issues as well as performance costs. > > What's the cost of upgrading compared to the cost of writing code that > works > in every version? I think upgrading the system to PHP 5 will take you > maybe > half an hour, while you can spend a lot more hours on writing backward > compatible code. PHP is not very good with compatibility across > versions > anyway. Hopefully all PHP 5 code will work in PHP 6. > > How about this PHP developers: You could make a global variable (or > constant) the user can set like > > define('PHP_COMPATIBLE_VERSION', '5.0.1'); > > or something to tell PHP 6 to interpret it like PHP 5.x . That way, at > least > you are guaranteed that the code will work like on that version. It > might > make PHP 6 (a lot?) bigger but it might be worth the cost, since all > Sites > written in PHP will still work. The functions could still have a > performance > boost that way if there are better algorithms. > > Sorry for steeling the thread. > > Regards, > Tim > > Tim-Hinnerk Heuer > > http://www.ihostnz.com > > > On Fri, Feb 6, 2009 at 12:55 AM, Thodoris <tgol@xxxxxxxxxx> wrote: > > > > > Is there a way to check not only if a function exists, but also to > check > >> that the number and types of parameters desired match a function > definition? > >> > >> The reason being that additional options have been added in php 4 > and 5 to > >> various standard function calls, but I'm still running a php3 and > php4 > >> server in addition to a php5 server. I would like to make sure that > certain > >> "extended" function calls still work in all versions (or I'll > perform the > >> tasks "manually", albeit less efficiently). > >> > >> One example I can think of is the round() function. The $precision > >> parameter was added in php4, so will not work in php3. However, > >> function_exists would return TRUE for both 3 and 4, but round itself > would > >> fail if I tried to send a precision level to the php3 server. > >> > >> Thanks much, > >> Matt > >> > >> P.S. Of course the modified "function_exists" would unfortunately > have to > >> be a recognized function/method in php3 in order for me to call it > to check > >> parameter counts on a php3 server :( > >> > >> > > I am sure you have some good reasons for keeping php3 right? > > > > Why don't you consider updating to at least php4 ?? > > > > PHPv3 is not even maintained and PHPv4 is not being developed any > more. > > > > So by the end of this year (I hope) we will start using a stable > PHPv6. > > > > IMHO you should consider changing your code (if this is possible) to > a more > > mainstream version. I think it would be much easier to run several versions of PHP in tandem on the same server, and let an .htaccess file (or some other such convention) determine the version of PHP to run particular files/directories/etc. with. My 2c, // Todd -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
