Others can provide a much better answer than I, but here's some information to get you started.
Including your own php code is generally done through through one of two systems for extending eZ Publish: template operators (http://ezpedia.org/wiki/en/ez/template_operators) and modules (http://ezpedia.org/wiki/en/ez/module).
Of course, eZ Publish has an extensive template language which draws upon a wealth of php code, greatly expediting custom CMS development. You can learn more about it here: http://ez.no/doc/ez_publish/technical_manual/4_0/templates/the_template_language
See also the reference section of the documentation: http://ez.no/doc/ez_publish/technical_manual/4_0/reference
I just came back here to thank you for your reply and to inform other readers of this thread that I finally chose neither ezpublish nor drupal. I'm now working with joomla which seems to be the only open source CMS on the market providing a combination of multilingual, multi user group, preselect profile at registration, easy-to-use-your-own-php-code features.
Thanks anyway! Markus
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