flight/core/Loader.php
public static function addDirectory($dir) {
        if (is_array($dir) || is_object($dir)) {
            foreach ($dir as $value) {
                self::addDirectory($value);
            }
        }
        else if (is_string($dir)) {
            if (!in_array($dir, self::$dirs)) self::$dirs[] = $dir;
        }
    }
public static function addDirectory($dir) {
        if (is_array($dir) || is_object($dir)) {
            foreach ($dir as $value) {
                self::addDirectory($value);
            }
        }
        else if (is_string($dir)) {
            if (!in_array($dir, self::$dirs)) self::$dirs[] = $dir;
        }
    }
Adds a directory for autoloading classes.

@param mixed $dir Directory path