Usage of dynamic properties

The creation of dynamic properties is deprecated, unless the class opts in by using the #[\AllowDynamicProperties] attribute. stdClass allows dynamic properties. Usage of the __get()/__set() magic methods is not affected by this change. A dynamic properties deprecation warning can be addressed by:

• Declaring the property (preferred).
• Adding the #[\AllowDynamicProperties] attribute to the class (which also applies to all child classes).
• Using a WeakMap if additional data needs to be associated with an object which one does not own.

Relative callables

Callables that are not accepted by the $callable() syntax (but are accepted by call_user_func()) are deprecated. In particular:

• "self::method"
• "parent::method"
• "static::method"
• ["self", "method"]
• ["parent", "method"]
• ["static", "method"]
• ["Foo", "Bar::method"]
• [new Foo, "Bar::method"]

This does not affect normal method callables such as "A::method" or ["A", "method"].

"${var}" and "${expr}" style interpolation

The "${var}" and "${expr}" style of string interpolation is deprecated. Use "$var"/"{$var}" and "{${expr}}", respectively.