eZ Publish 3.4.x only runs properly on PHP 4.3.x. From eZ Publish 3.7.x on you can use PHP 4.4.x. I recommend you to upgrade the site to at least 3.7.10. Note however that these versions are not supported anymore, so might be better to move to a supported version (3.9+) as well.
You can find all archived downloads on http://ez.no/download/ez_publish.