A simple implementation for alternate output in PHP

This function was original from Kohana’s Text Helper.

/**
 * Alternates between two or more strings.
 *
 * @param   string  strings to alternate between
 * @return  string
 */
public static function alternate()
{
    static $i;

    if (func_num_args() === 0)
    {
        $i = 0;
        return '';
    }

    $args = func_get_args();
    return $args[($i++ % count($args))];
}