Module not working in PHP 4.3.9

Hey, our server still has a really old PHP version for a while, which is how I noticed this.

It seems like at least this version of PHP doesn't understand default values for reference type variables. As soon as I enabled the Domain access module, I was getting a whole bunch of PHP errors, and got rid of the problem by just taking all the &-signs off the implementations of hook_user_domainupdate. Don't know if this breaks something else but at least I don't get any errors anymore.

This could be considered as a minor bug, since there probably isn't a lot of people using PHP4 anymore. Drupal 6 should still work on it, so all the modules for it should too, right? This is the reason I marked this as critical.

The files and rows I modified to get this straight:

domain.module row 1242
domain_content.module row 156
domain_nav.module row 262
domain_prefix.module row 107
domain_source.module row 184
domain_user.module row 279