I was told different by alot of people, that some functions in PHP cannot be done in Perl, unless hardcoded into a Perl Module

Firstly anything that you can do in PHP you can do in Perl, but that goes for pretty much any other language (concerning APIs a least). Secondly, yes, the functions in PHP will be 'hardcoded' in Perl modules, but this isn't all that different from how PHP is structured since it's just a series of modules all compiled into a single binary (be it executable or module, statically or dynamically linked). So really this is something of an apples and oranges situation.
HTH

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broquaint