Quote:
Originally Posted by k0nr4d
I understand there's the possibility of some compatibility issues because of register_globals being off by default but god damn. its 7 years old! 
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register_globals was off by default in php4 as well
This wouldn't be a problem if it was the only difference between the two
but from php4 to php5 there are major changes
People have lots of custom code that will be a pain to upgrade to php5
A lot of other software is not compatible with php5 yet. php5 requires
mysql5 and apache2 in order to make use of all its features.
Everyone has different reasons for not switching and among them its the fact
that php4 is widely used and pretty stable compared to php5.
Any host will install php5 for you if you asked for it.