Segment.php

<?php

public static function Segment($key = null, $default = false)
{
	static $result = null;

	if (is_null($result) === true)
	{
		if (count($result = explode('/', substr(self::Value($_SERVER, 'PHP_SELF'), strlen(self::Value($_SERVER, 'SCRIPT_NAME'))))) > 0)
		{
			$result = array_values(array_filter($result, 'strlen'));
		}
	}

	if (isset($key) === true)
	{
		if (is_int($key) === true)
		{
			return self::Value($result, $key, $default);
		}

		else if (($key = array_search($key, $result)) !== false)
		{
			return self::Value($result, $key + 1, $default);
		}

		return false;
	}

	return $result;
}