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PHP instanceof Keyword
Definition and Usage
The instanceof keyword is used to check if an object belongs to a class. The comparison returns true if the object is an instance of the class, it returns false if it is not.
The PHP instanceof keyword is used to determine if an object is an instance of a specific class or interface. It's essential for type checking in object-oriented PHP programming. This operator helps ensure type safety.
Basic Definitions

The instanceof operator checks if an object is an instance of a class. It can also verify if an object implements an interface. The operator returns true if the object matches the specified type.

Syntax: $object instanceof ClassName or $object instanceof InterfaceName. The left operand is the object to check. The right operand is the class/interface name.

The operator also works with parent classes and inherited interfaces. It's useful for polymorphism and type checking before method calls.