And you think this is inferior to other languages where you would have to write that yourself or pick one of dozens of unofficial implementations with bugs unknown to you?
One could blame PHP for not having namespaces, but certainly not for providing official implementations for often-used pieces of functionality (though in case of easter_date? How many functions with different functionality do you come up with that you would like to give the same name?)
(edit: I'm not trying to troll here. OP has said he was "disgusted" by the presence of easter_date and from that I was inferring that he would prefer PHP not to have easter_date, thus my assertion of PHP being "inferior" to other languages that lack easter_date. By no means did I want to sound rude just a bit cynical maybe. I apologize for that.)