Detect if array is indexed or associative

Question

Possible duplicate:
PHP arrays: a good way to check if an array is associative or sequential?

What would be the most efficient way to check if an array is associative or not in PHP?

Answer 1

If it is necessary to iterate through an array to be safe, you can always use foreach.

Answer 2

is_int(key($someArray))

Answer 3

PHP .