What are some potential pitfalls to be aware of when using PHP for object-oriented programming?

One potential pitfall when using PHP for object-oriented programming is the lack of strict data typing, which can lead to unexpected behavior and errors. To address this issue, you can use scalar type declarations and return type declarations to enforce data types for method parameters and return values. 

class Calculator {
    public function add(int $num1, int $num2): int {
        return $num1 + $num2;
    }
}

$calc = new Calculator();
$result = $calc->add(5, 10); // Output: 15

Keywords

inheritance encapsulation polymorphism class method overriding

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