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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