A backwards-compatible trait for deprecated dynamic properties in 8.2

DynamicProperties.php

<?php

/**
 * This is a very simple and basic trait for overcoming the deprectation of dynamic properties in 8.2, and broken in 9.0.
 * 
 * If using a 8.2 or later, use the #[AllowDynamicProperties] attribute instead of this.
 *
 * I suggest this is better than traditional dynamic properties for the simple fact that it's excplicit and therefore
 * intentional. If your class already has magic methods then you don't need this. This will work in 8.2 or later and as far
 * back as 5.4, so it should cover most sensible cases.
 *
 * @see https://wiki.php.net/rfc/deprecate_dynamic_properties
 */
Trait DynamicProperties {
    private $dynamicProperties = [];
    
    public __get($prop) {
        return $this->dynamicProperties[$prop];
    }
    
    public __set($prop, value) {
        $this->dynamicProperties[$prop] = $value;
    }
    
    public __isset($prop) {
        return isset($this->dynamicProperties[$prop]);
    }
    
    public __unset($prop) {
        unset($this->dynamicProperties[$prop]);
    }
}

// Usage
class MyClassThatAllowsDynamicProperties {
    use DynamicProperties;
    
    // do other stuff
}