Copyright

57class Copyright58{59    /**60     * Copyright URL61     *62     * @var string63     * @see get_url()64     */65    public $url;66 67    /**68     * Attribution69     *70     * @var string71     * @see get_attribution()72     */73    public $label;74 75    /**76     * Constructor, used to input the data77     *78     * For documentation on all the parameters, see the corresponding79     * properties and their accessors80     */81    public function __construct($url = null, $label = null)82    {83        $this->url = $url;84        $this->label = $label;85    }86 87    /**88     * String-ified version89     *90     * @return string91     */92    public function __toString()93    {94        // There is no $this->data here95        return md5(serialize($this));96    }97 98    /**99     * Get the copyright URL100     *101     * @return string|null URL to copyright information102     */103    public function get_url()104    {105        if ($this->url !== null) {106            return $this->url;107        }108 109        return null;110    }111 112    /**113     * Get the attribution text114     *115     * @return string|null116     */117    public function get_attribution()118    {119        if ($this->label !== null) {120            return $this->label;121        }122 123        return null;124    }125}