If your function takes an array parameter. You can check it and access it like this: Here the call to %zend_parse_parameters()% does the type check. If the user passes a non-array to this function s/he will get a message that looks like this: If you wanted to write a function that could take either an array of integers or perhaps a single integer and have your function figure it out automatically you do do it like this: The possible types are: