What are the implications of not being able to include variables in PHP interfaces?

When creating PHP interfaces, you cannot include variables in them. This is because interfaces define a contract for classes to implement methods, not properties. To work around this limitation, you can create abstract classes that implement the interface and define the necessary properties. Classes that extend the abstract class will then inherit these properties. 

<?php
interface MyInterface {
    public function myMethod();
}

abstract class AbstractClass implements MyInterface {
    protected $myProperty;

    public function myMethod() {
        // implementation
    }
}

class MyClass extends AbstractClass {
    // additional implementation
}
?>

Keywords

PHP interfaces variables object-oriented programming strict typing error_reporting

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