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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 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 SendGrid API * * @return string */ public function jsonSerialize() { return $this->getSubject(); } }