PHP 4.4.2 Update Issues?

["example.email.address@xxxxxxxxx" <example.email.address@xxxxxxxxx>]

Hello


I've started work for a client who has their own server running PHP 
4.1.1. If I upgrade them to PHP 4.4.2, will there be any issues I'd
need to look out for?

Is there a general process (or checklist) I should follow when
upgrading PHP versions to find where potential the may be potential
code problems?


Thank you for your assistance

Tim

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