unyx / utils

    public static function initial(array $array, $callback, $default = null)

    {

        // When given a callable, keep counting as long as the callable returns a truthy value.

        if (is_callable($callback)) {

            $i = 0;

            foreach (array_reverse($array) as $key => $value) {

                if (!call_user_func($callback, $key, $value)) {

                    break;

                }

                $i++;

            }

            // If we didn't get at least a single truthy value, return the default.

            if ($i === 0) {

                return $default;

            }

            // Otherwise we're just gonna overwrite the $callback and proceed as if it were an integer in the

            // first place.

            $callback = $i;

        }

        // At this point we need a positive integer, 1 at minimum.

        return array_slice($array, 0, -(int) (!$callback ? 1 : abs($callback)));

        }

        // With a callable given, keep counting as long as the callable returns a truthy value.

        if (is_callable($callback)) {

            $i = 0;

            foreach ($array as $key => $value) {

                if (!call_user_func($callback, $key, $value)) {

                    break;

                }

                $i++;

            }

            // If we didn't get at least a single truthy value, return the default.

            if ($i === 0) {

                return $default;

            }

            // Otherwise we're just gonna overwrite the $callback and proceed as if it were an integer in the

            // first place.

            $callback = $i;

        }

        // Return the final $callback elements.

        return array_slice($array, abs((int) $callback));