How does php store sessions in json format instead of the default built-in encoding?

How does php store sessions in json format instead of the default built-in encoding? After all, even if session_save_handler is overwritten by its own classes or methods, the inbound and outbound data of write and read is serialized, and session serialization is not a general serialization... still not... how does php store sessions in json format instead of the default built-in encoding?

After all, even if session_save_handler is overwritten by its own classes or methods, the inbound and outbound data of write and read is serialized, and session serialization is not a general serialization... still cannot solve the problem that memcached saves session data in json format

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How does php store sessions in json format instead of the default built-in encoding?

After all, even if session_save_handler is overwritten by its own classes or methods, the inbound and outbound data of write and read is serialized, and session serialization is not a general serialization... still cannot solve the problem that memcached saves session data in json format

Found the solution:

   */class Memcached{    /**     * @var \Memcached     */    protected $memcached;    /**     * Create new memcached session save handler     * @param \Memcached $memcached     */    public function __construct(\Memcached $memcached)    {        $this->memcached = $memcached;    }    /**     * Close session     *     * @return boolean     */    public function close()    {        return true;    }    /**     * Destroy session     *     * @param string $id     * @return boolean     */    public function destroy($id)    {        return $this->memcached->delete("sessions/{$id}");    }    /**     * Garbage collect. Memcache handles this with expiration times.     *     * @param int $maxlifetime     * @return boolean Always true     */    public function gc($maxlifetime)    {        // let memcached handle this with expiration time        return true;    }    /**     * Open session     *     * @param string $savePath     * @param string $name     * @return boolean     */    public function open($savePath, $name)    {        // Note: session save path is not used        $this->sessionName = $name;        $this->lifetime = ini_get('session.gc_maxlifetime');        return true;    }    /**     * Read session data     *     * @param string $id     * @return string     */    public function read($id)    {        $_SESSION = json_decode($this->memcached->get("sessions/{$id}"), true);        if (isset($_SESSION) && !empty($_SESSION) && $_SESSION != null)        {            return session_encode();        }        return '';    }    /**     * Write session data     *     * @param string $id     * @param string $data     * @return boolean     */    public function write($id, $data)    {        // note: $data is not used as it has already been serialised by PHP,        // so we use $_SESSION which is an unserialised version of $data.        return $this->memcached->set("sessions/{$id}", json_encode($_SESSION),            $this->lifetime);    }}

You can consider writing a database.