wow, the best!!!

that was my first idea but then I decided to use preg_match_all since it returns the number of matches and there is an 'i' modifier.

From the Kata Description:

Preloaded for you is a function say_list which receives an array as its only argument and has the following behaviour:

say_list(["Apple"]) // => "Apple"
say_list(["Apple", "Orange"]) // => "Apple or Orange"
say_list(["Apple", "Banana", "Dragonfruit", "Kiwi"]) // "Apple, Banana, Dragonfruit or Kiwi"

You may find this function useful when implementing one of the methods of one of the classes in this Kata.

From the Kata Description:

Preloaded for you is a function say_list which receives an array as its only argument and has the following behaviour:

say_list(["Apple"]) // => "Apple"
say_list(["Apple", "Orange"]) // => "Apple or Orange"
say_list(["Apple", "Banana", "Dragonfruit", "Kiwi"]) // "Apple, Banana, Dragonfruit or Kiwi"

You may find this function useful when implementing one of the methods of one of the classes in this Kata.

WTF is say_list()? It can't find even on php.net .

Hmm, where is saylist() defined? I can't find it?