Online PHP editor | refs for ONeE9

<?php class A {} class B {} class C {} class D {} class Z { public function __construct( protected A $a, protected C|B $c, protected D|C $d, ?D $unused = NULL, ) { if ($this->c instanceof B) { trigger_error('A, B, C, D is deprecated, pass A, C, D instead', E_USER_DEPRECATED); $this->c = $this->d; $this->d = $unused; } var_dump($this->a); var_dump($this->c); var_dump($this->d); } } new Z(new A(), new B(), new C(), new D()); new Z(new A(), new C(), new D());