Class PHPStan\Type\TypeTraverser

Map a Type recursively

For every Type instance, the callback can return a new Type, and/or decide to traverse inner types or to ignore them.

The following example converts constant strings to objects, while preserving unions and intersections:

TypeTraverser::map($type, function (Type $type, callable $traverse): Type { if ($type instanceof UnionType || $type instanceof IntersectionType) { // Traverse inner types return $traverse($type); } if ($type instanceof ConstantStringType) { // Replaces the current type, and don't traverse return new ObjectType($type->getValue()); } // Replaces the current type, and don't traverse return new MixedType(); });