Note that PHP extensions also provide interfaces you can implement, for example JsonSerializable.
Here is the full list http://php.net/manual/en/refs.basic.other.php
See also the SPL Interfaces and reserved classes.
Note that PHP extensions also provide interfaces you can implement, for example JsonSerializable.
Here is the full list http://php.net/manual/en/refs.basic.other.php