<commit_before><?php 
/**
 * This helper builds the GroupsToDisplay object for a /mail/send API call
 * 
 * PHP Version - 5.6, 7.0, 7.1, 7.2
 *
 * @package   SendGrid\Mail
 * @author    <NAME> <<EMAIL>>
 * @copyright 2018 SendGrid
 * @license   https://opensource.org/licenses/MIT The MIT License
 * @version   GIT: <git_id>
 * @link      http://packagist.org/packages/sendgrid/sendgrid 
 */
namespace SendGrid\Mail;

/**
 * This class is used to construct a GroupsToDisplay object for 
 * the /mail/send API call
 * 
 * @package SendGrid\Mail
 */
class GroupsToDisplay implements \JsonSerializable
{
    // @var int[] An array containing the unsubscribe groups that 
    // you would like to be displayed on the unsubscribe 
    // preferences page. Maximum of 25
    private $groups_to_display;

    /**
     * Optional constructor
     *
     * @param int[]|int|null $groups_to_display An array containing 
     *                                          the unsubscribe groups 
     *                                          that you would like to 
     *                                          be displayed on the 
     *                                          unsubscribe preferences 
     *                                          page. Maximum of 25
     */ 
    public function __construct($groups_to_display=null)
    {
        if (isset($groups_to_display)) {
            $this->setGroupsToDisplay($groups_to_display);
        }
    }

    /**
     * Add a group to display on a GroupsToDisplay object
     *
     * @param int|int[] $groups_to_display The unsubscribe group(s) 
     *                                     that you would like to be 
     *                                     displayed on the unsubscribe 
     *                                     preferences page
     * 
     * @return null
     */ 
    public function setGroupsToDisplay($groups_to_display)
    {
        $this->groups_to_display[] = $groups_to_display;
    }

    /**
     * Return the group(s) to display on a GroupsToDisplay object
     * 
     * @return int[]
     */ 
    public function getGroupsToDisplay()
    {
        return $this->groups_to_display;
    }

    /**
     * Return an array representing a GroupsToDisplay object for the SendGrid API
     * 
     * @return null|array
     */  
    public function jsonSerialize()
    {
        return $this->getGroupsToDisplay();<commit_msg>Fix setGroupsToDisplay's handling of array arguments<commit_after><?php 
/**
 * This helper builds the GroupsToDisplay object for a /mail/send API call
 * 
 * PHP Version - 5.6, 7.0, 7.1, 7.2
 *
 * @package   SendGrid\Mail
 * @author    <NAME> <<EMAIL>>
 * @copyright 2018 SendGrid
 * @license   https://opensource.org/licenses/MIT The MIT License
 * @version   GIT: <git_id>
 * @link      http://packagist.org/packages/sendgrid/sendgrid 
 */
namespace SendGrid\Mail;

/**
 * This class is used to construct a GroupsToDisplay object for 
 * the /mail/send API call
 * 
 * @package SendGrid\Mail
 */
class GroupsToDisplay implements \JsonSerializable
{
    // @var int[] An array containing the unsubscribe groups that 
    // you would like to be displayed on the unsubscribe 
    // preferences page. Maximum of 25
    private $groups_to_display;

    /**
     * Optional constructor
     *
     * @param int[]|int|null $groups_to_display An array containing 
     *                                          the unsubscribe groups 
     *                                          that you would like to 
     *                                          be displayed on the 
     *                                          unsubscribe preferences 
     *                                          page. Maximum of 25
     */ 
    public function __construct($groups_to_display=null)
    {
        if (isset($groups_to_display)) {
            $this->setGroupsToDisplay($groups_to_display);
        }
    }

    /**
     * Add a group to display on a GroupsToDisplay object
     *
     * @param int|int[] $groups_to_display The unsubscribe group(s) 
     *                                     that you would like to be 
     *                                     displayed on the unsubscribe 
     *                                     preferences page
     * 
     * @return null
     */ 
    public function setGroupsToDisplay($groups_to_display)
    {
        if (is_array($groups_to_display)) {
            $this->groups_to_display = $groups_to_display;
        } else {
            $this->groups_to_display[] = $groups_to_display;
        }
    }

    /**
     * Return the group(s) to display on a GroupsToDisplay object
     * 
     * @return int[]
     */ 
    public function getGroupsToDisplay()
    {
        return $this->groups_to_display;
    }

    /**
     * Return an array representing a GroupsToDisplay object for the SendGrid API
     * 
     * @return null|array
     */  
    public function jsonSerialize()
    {
        return $this->getGroupsToDisplay();
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