Voting starts in March for the Drupal Association Board election.
Depending on your Drupal version, php 4.4.0 up to php 5.2.x can be required (see requirements here).
Some of the oldest Drupal versions will only work with php 4 (ex.: Drupal 4.3.2), while numerous newer modules will rarely work on php 4 (you may get an error such as: Parse error: syntax error, unexpected T_VARIABLE ).
If your hosting service has both php 4 and php 5 available, which is almost always the case, you can easily choose which version should be used by your Drupal installations.
For example, you can have an older site running on php 4 and, on the same hosting account, have another running on php 5.
HOW TO :
In the .htaccess file of a given Drupal installation, simply add (preferably as the first item) :
AddHandler application/x-httpd-php5 .php
AddHandler application/x-httpd-php4 .php
Note that Cpanel usually gives you the option to select the default running PHP version, but this does not cause any problems. You can select PHP 4 as the default in the Cpanel, and nonetheless invoke PHP 5 in the .htaccess of a given Drupal installation.