Implement array object compatible array functions

[kherge]

Problem

If I use an array object, I am no longer able to use any of the array functions that PHP provides.

$array = new ArrayObject();

// Warning: array_search() expects parameter 2 to be array, object given
$index = array_search(123, $array);

Resolution

Implement the available array functions with support for any ArrayAccess or Iterator implementation. The implementations should default to use PHP's array_ functions if an actual array is provided.

use function KHerGe\Arrays\search;

$array = new ArrayObject();

$index = search($array, 123);

References

1. http://php.net/manual/en/ref.array.php

[kherge]

Some functions produce new arrays. Since array objects can have keys that are invalid for normal arrays, it may not be possible to return a normal array. Should the functions default to using AnyKey for new arrays?