Description Allows multiple possible types[fn:rc] to be given to a parameter/member. Syntax class Example { private int|float $foo; public function __construct(int|float $foo) { $this->foo = $foo; } public function doSomethingWithMultipleTypes(float|int $bar): int|float { return ($bar + $this->foo) * 2; } } Inheritance class A{ public function foo(string|int $foo): string|int {} } class B extends A{ public function foo(string|int|float $foo): string {} } Footnotes