3 years ago

Category: PHP, javascript

This is fine as long as you want to give some context as to what would be the type of that property but it essentially does not really do type check by the PHP compiler. So, to mitigate this issue, PHP 8 has introduced a dedicated mixed type that can be used to assign a mixed type to the class properties and return type of class methods. Essentially, A type of mixed would be equivalent to array or bool or callable or int or float or null or object or resource or string. So, whenever you would be unsure about the type of the property, you would use mixed for the same.

As the mixed type also include null type, it would be ridiculous to make it nullable as it would only add duplication of information as ?mixed would be always be equivalent to be mixed.