Are there potential pitfalls or limitations when using interfaces in PHP, especially in terms of automatic type conversion?

When using interfaces in PHP, one potential pitfall is automatic type conversion, where PHP may attempt to convert types when implementing interface methods. To avoid this, it is important to strictly type hint method parameters and return types in both the interface and implementing classes. By explicitly defining the types, you can prevent unexpected type conversions and ensure type safety in your code.

interface Shape {
    public function calculateArea(): float;
}

class Circle implements Shape {
    public function calculateArea(): float {
        // Calculate area of circle
    }
}

class Square implements Shape {
    public function calculateArea(): float {
        // Calculate area of square
    }
}