Interfaces may only include hooked properties

Description

PHP 8.4 introduced the support for properties in interfaces. Although, the properties must have a property hook, aka one associated method that deals with get and set operations on that property.

Example

<?php

interface I {
    public $property;

    public $propertyWithHook {
     // This is an abstract property
     get;
    };

}
?>

Solutions

• Add an identity hook, such as get => $this->property = $value;, which is the default behavior.

• Turn the interface into an abstract class.

• Turn the interface into a trait.

In more recent PHP versions, this error message is now Interfaces may not include properties.