With DNF types we can use union and intersection types at some class methods. This allows declarations with a strict rule. At older versions, we have to create a condition to verify, for example, if some argument is an instance of some class. With this behavior, this validation can be declared without using the scope of the function.
Example:
Old behavior:
class Car {
public function radio(mixed $entity) {
if ((($entity instanceof A) && ($entity instanceof B)) || ($entity === null)) {
return $entity;
}
throw new Exception('Invalid entity');
}
}
New behavior:
class Car {
public function radio((A&B)|null $entity) {
return $entity;
}
}
July 12, 2024, 02:22 pm
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