[dev] is_null and php requirement

[Chuck Hagenbuch]

Quoting mailling@bigfoot.com:

> I plan to use the function is_null, but this function is available from php 
> 4.0.4 So I would like to know what the actual requirement is about php, and if
> we put the minimum to php 4.0.4 could be an issue?

If you look here:

http://www.horde.org/imp/2.3/supported.php

... we're already there for IMP 2.3, so it's fine for any dev code.

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
Some fallen angels have their good reasons.