Unserialize() checks for the presence of a function with the magic name _wakeup(). Also, the function is useful if a very large object doesn't need to be saved completely. The intended use of _sleep() is to commit pending data or perform similar cleanup tasks. Doing this will result in an E_NOTICE level error. It is not possible for _sleep() to return names of private properties in parent classes. If the method doesn't returnĪnything then null is serialized and E_NOTICE is issued. It can clean up the object and is supposed to return an array with the names of all variables of that object that should be serialized. If so, that function is executed prior to any serialization. Serialize() checks if the class has a function with the magic name _sleep(). However, _construct() and _destruct() must not declare a return type otherwise a fatal error is emitted. Prior to PHP 8.0.0, no diagnostic was emitted. The signature described in this document. If type declarations are used in the definition of a magic method, they must be identical to _serialize(), _unserialize(), and _set_state(). Prior to PHP 8.0.0, no diagnostic was emitted for the magic methods _sleep(), _wakeup(), _clone(), must be declared as public, otherwise an E_WARNING is emitted. _toString(), _invoke(), _set_state(), _clone(), andĪll magic methods, with the exception of _construct(), _destruct(), and _sleep(), _wakeup(), _serialize(), _unserialize(), _construct(), _destruct(), _call(), _callStatic(), The following method names are considered magical: Therefore, it is not recommended to use such method names unless overriding PHP's behavior. All methods names starting with _ are reserved by PHP.
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