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Filename : Header.php
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<?php
/**
 * This helper builds the Header 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 Header object for the /mail/send API call
 *
 * An object containing key/value pairs of header names and the value to substitute
 * for them. You must ensure these are properly encoded if they contain unicode
 * characters. Must not be one of the reserved headers
 *
 * @package SendGrid\Mail
 */
class Header implements \JsonSerializable
{
    /** @var $key string Header key */
    private $key;
    /** @var $value string Header value */
    private $value;

    /**
     * Optional constructor
     *
     * @param string|null $key Header key
     * @param string|null $value Header value
     */
    public function __construct($key = null, $value = null)
    {
        if (isset($key)) {
            $this->setKey($key);
        }
        if (isset($value)) {
            $this->setValue($value);
        }
    }

    /**
     * Add the key on a Header object
     *
     * @param string $key Header key
     * 
     * @throws TypeException
     */ 
    public function setKey($key)
    {
        if (!is_string($key)) {
            throw new TypeException('$key must be of type string.');
        }
        $this->key = $key;
    }

    /**
     * Retrieve the key from a Header object
     *
     * @return string
     */
    public function getKey()
    {
        return $this->key;
    }

    /**
     * Add the value on a Header object
     *
     * @param string $value Header value
     * 
     * @throws TypeException
     */ 
    public function setValue($value)
    {
        if (!is_string($value)) {
            throw new TypeException('$value must be of type string.');
        }
        $this->value = $value;
    }

    /**
     * Retrieve the value from a Header object
     *
     * @return string
     */
    public function getValue()
    {
        return $this->value;
    }

    /**
     * Return an array representing a Header object for the Twilio SendGrid API
     *
     * @return null|array
     */
    public function jsonSerialize()
    {
        return array_filter(
            [
                'key' => $this->getKey(),
                'value' => $this->getValue()
            ],
            function ($value) {
                return $value !== null;
            }
        ) ?: null;
    }
}