PHP5 is currently in RC3 State.
AFAIK it should be the last Release Candidate.
But to answer your question exactly. It's not absolutelly clear, that it's because of not having php5, if some functions don't work.
It could also be a special module, which is not activated in standard php installations (for example pdf functions or something like)
you may have to edit your php.ini fle to enable those modules
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