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<?php
/**
* This helper builds the Subject object for a /mail/send API call
*
* PHP Version - 5.6, 7.0, 7.1, 7.2
*
* @package SendGrid\Mail
* @author Elmer Thomas <dx@sendgrid.com>
* @copyright 2018-19 Twilio 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 Subject object for the /mail/send API call
*
* @package SendGrid\Mail
*/
class Subject implements \JsonSerializable
{
/** @var $subject string The email subject */
private $subject;
/**
* Optional constructor
*
* @param string|null $subject The email subject
*/
public function __construct($subject = null)
{
if (isset($subject)) {
$this->setSubject($subject);
}
}
/**
* Set the subject on a Subject object
*
* @param string $subject The email subject
*
* @throws TypeException
*/
public function setSubject($subject)
{
if (!is_string($subject)) {
throw new TypeException('$subject must be of type string.');
}
$this->subject = $subject;
}
/**
* Retrieve the subject from a Subject object
*
* @return string
*/
public function getSubject()
{
return mb_convert_encoding($this->subject, 'UTF-8', 'UTF-8');
}
/**
* Return an array representing a Subject object for the Twilio SendGrid API
*
* @return string
*/
public function jsonSerialize()
{
return $this->getSubject();
}
}
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