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<?php class Foo { readonly int $y; public function test(&$x) { $x = 4; } public function init() { $this->test($this->y); } } $a = new Foo(); $a->init(); var_dump($a);
Output for git.master, git.master_jit
Fatal error: Uncaught Error: Cannot indirectly modify readonly property Foo::$y in /in/ghZR5:11 Stack trace: #0 /in/ghZR5(15): Foo->init() #1 {main} thrown in /in/ghZR5 on line 11
Process exited with code 255.

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