Are there specific structures that classes must adhere to in order to be considered object-oriented in PHP?

In PHP, classes must adhere to certain structures in order to be considered object-oriented. This includes using the "class" keyword to define a class, using properties to store data, and using methods to define actions that can be performed on the data. Additionally, classes should utilize concepts such as encapsulation, inheritance, and polymorphism to fully leverage the benefits of object-oriented programming.

class MyClass {
    // Properties
    public $property1;
    
    // Methods
    public function method1() {
        // Method implementation
    }
}