Method: Verify whether a received input parameter is _accessible as if it were an array_.

Method: Verify whether a received input parameter is “iterable”.

Method: Verify whether a received input parameter is a Curl handle.

Method: Verify whether a received input parameter is “stringable”.

Method: Verify that a received input parameter is of type string or is “stringable”.

Method: Verify whether a received input parameter is usable as an integer array key.