Output
Array ( [0] => Mike [1] => 25 [2] => Male [3] => American )
Array ( [0] => Name [1] => Age [2] => Gender [3] => Nationality )
Array ( [0] => Adam [1] => Bran [2] => Jacob [3] => stacey )
Array ( [0] => 72 [1] => 65 [2] => 12 [3] => 23 [4] => 54 [5] => 43 [6] => 10 )
Jacob
Array ( [0] => Adam [1] => Bran [2] => Jacob )
Array ( [0] => Adam [1] => Bran [2] => Jacob [3] => Elizabeth )
Gender key exists in associative array
Mike value exists in associative array
7