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The guy who is designing our website says he can't run the php 4.3 code he wrote the site with on a server that has 4.0 - could this be possible? What is the difference between the 4.0 version and the 4.3??
Definitely upgrade, 4.0 is very out of date and there are a number of changes that were made between 4.0 and 4.1 that would mean that code written for 4.1 and up will not neccessarily work on 4.0.