ContentItem.php

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<?php

namespace IMSGlobal\LTI\ToolProvider;

class ContentItem
{

    const LTI_LINK_MEDIA_TYPE = 'application/vnd.ims.lti.v1.ltilink';

    function __construct($type, $placementAdvice = null, $id = null)
    {

        $this->{'@type'} = $type;
        if (is_object($placementAdvice) && (count(get_object_vars($placementAdvice)) > 0)) {
            $this->placementAdvice = $placementAdvice;
        }
        if (!empty($id)) {
            $this->{'@id'} = $id;
        }

    }

    public function setUrl($url)
    {

        if (!empty($url)) {
            $this->url = $url;
        } else {
            unset($this->url);
        }

    }

    public function setMediaType($mediaType)
    {

        if (!empty($mediaType)) {
            $this->mediaType = $mediaType;
        } else {
            unset($this->mediaType);
        }

    }

    public function setTitle($title)
    {

        if (!empty($title)) {
            $this->title = $title;
        } else if (isset($this->title)) {
            unset($this->title);
        }

    }

    public function setText($text)
    {

        if (!empty($text)) {
            $this->text = $text;
        } else if (isset($this->text)) {
            unset($this->text);
        }

    }

    public static function toJson($items)
    {
/*
        $data = array();
        if (!is_array($items)) {
            $data[] = json_encode($items);
        } else {
            foreach ($items as $item) {
                $data[] = json_encode($item);
            }
        }
        $json = '{ "@context" : "http://purl.imsglobal.org/ctx/lti/v1/ContentItem", "@graph" : [' . implode(", ", $data) . '] }';
*/
        $obj = new \stdClass();
        $obj->{'@context'} = 'http://purl.imsglobal.org/ctx/lti/v1/ContentItem';
        if (!is_array($items)) {
          $obj->{'@graph'} = array();
          $obj->{'@graph'}[] = $items;
        } else {
          $obj->{'@graph'} = $items;
        }

        return json_encode($obj);

    }

}