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<?php /** * This helper builds the Section 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 Section object for the /mail/send API call * * An object of key/value pairs that define block sections of code to be used * as substitutions * * @package SendGrid\Mail */ class Section implements \JsonSerializable { /** @var $key string Section key */ private $key; /** @var $value string Section value */ private $value; /** * Optional constructor * * @param string|null $key Section key * @param string|null $value Section value */ public function __construct($key = null, $value = null) { if (isset($key)) { $this->setKey($key); } if (isset($value)) { $this->setValue($value); } } /** * Add the key on a Section object * * @param string $key Section key * * @throws TypeException */ public function setKey($key) { if (!is_string($key)) { throw new TypeException('$key must be of type string.'); } $this->key = $key; } /** * Retrieve the key from a Section object * * @return string */ public function getKey() { return $this->key; } /** * Add the value on a Section object * * @param string $value Section value * * @throws TypeException */ public function setValue($value) { if (!is_string($value)) { throw new TypeException('$value must be of type string.'); } $this->value = $value; } /** * Retrieve the value from a Section object * * @return string */ public function getValue() { return $this->value; } /** * Return an array representing a Section object for the SendGrid API * * @return null|array */ public function jsonSerialize() { return array_filter( [ 'key' => $this->getKey(), 'value' => $this->getValue() ], function ($value) { return $value !== null; } ) ?: null; } }