Re: [PHP] function_exists question
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. -- Thodoris -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] 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 t...@kinetix.gr 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.
--
Thodoris
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RE: [PHP] function_exists question
-Original Message-
From: th.he...@gmail.com [mailto:th.he...@gmail.com] On Behalf Of
German Geek
Sent: Thursday, February 05, 2009 5:02 PM
To: t...@kinetix.gr
Cc: Matt Pagel; php-general@lists.php.net
Subject: Re: [PHP] 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 t...@kinetix.gr 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
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Re: [PHP] function_exists question
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.
php5 introduced this:
http://au.php.net/manual/en/ini.core.php#ini.zend.ze1-compatibility-mode
to make sure php5 interpreted php4 code in a b/c way, they may do
something similar for php6 - php5.
Doing it at runtime is silly imo.
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