array array_diff_ukey ( array $array1 , array $array2 [, array $... ], callable $key_compare_func );
array_diff_ukey function compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.
Unlike array_diff_key() a user supplied callback function is used for the indices comparison, not internal function.
Your functions are bloated. Put them on a diet. Think "skinny" and "as few lines as possible."
More coming soon…keep checking back.