/**
     * Like php array_key_exists, this instead search if (one or more) keys exists in the array
     * @param array $needles - keys to look for in the array
     * @param array $haystack - the <b>Associative</b> array to search
     * @param bool $all - [Optional] if false then checks if some keys are found
     * @return bool true if the needles are found else false. <br>
     * Note: if hastack is multidimentional only the first layer is checked<br>,
     * the needles should <b>not be<b> an associative array else it returns false<br>
     * The array to search must be associative array too else false may be returned
     */
    public function array_keys_exists($needles, $haystack, $all = true)
    {
        $size = count($needles);
        if($all) return count(array_intersect($needles, array_keys($haystack))) === $size;
        return !empty(array_intersect($needles, array_keys($haystack)));
    }