MY_arr.php

<?php defined('SYSPATH') OR die('No direct access allowed.');

class arr extends arr_Core {

	public static function is_assoc(array $array)
	{
		// Keys of the array
		$keys = array_keys($array);

		// If the array keys of the keys match the keys, then the array must
		// be associative.
		return array_keys($keys) !== $keys;
	}
}