Note: this function won't be called in case $session_data is unchanged. In order to call this function every time when session is about closing, add $_SESSION["timestamp"] = time();
(PHP 5 >= 5.4.0, PHP 7)
SessionHandlerInterface::write — Write session data
Writes the session data to the session storage. Called by session_write_close(), when session_register_shutdown() fails, or during a normal shutdown. Note: SessionHandlerInterface::close() is called immediately after this function.
PHP will call this method when the session is ready to be saved and closed. It encodes the session data from the $_SESSION superglobal to a serialized string and passes this along with the session ID to this method for storage. The serialization method used is specified in the session.serialize_handler setting.
Note this method is normally called by PHP after the output buffers have been closed unless explicitly called by session_write_close()
The session id.
The encoded session data. This data is the result of the PHP internally encoding the $_SESSION superglobal to a serialized string and passing it as this parameter. Please note sessions use an alternative serialization method.
The return value (usually
TRUE on success,
FALSE on failure). Note this value is returned internally to PHP for processing.