Question: Explain late static binding in PHP.

Answer: Late static binding allows static methods to reference the called class using the 'static' keyword. It helps resolve the class at runtime rather than at compile time.

Example:

class ParentClass { 
public static function whoAmI() { 
echo static::class; 
} 
}

 class ChildClass extends ParentClass { } 
ChildClass::whoAmI(); // Outputs 'ChildClass'