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<?php trait Immutable { public function __set($name, $value) { throw new Exception("can't touch this, nah nah nuh nahhh"); } } class ImmutableThingy { use Immutable; protected $foo = 'bar'; } $thing = new ImmutableThingy; var_dump($thing, $thing->foo); $thing->foo = 'baz'; var_dump($thing, $thing->foo);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot access protected property ImmutableThingy::$foo in /in/nhNUN:17 Stack trace: #0 {main} thrown in /in/nhNUN on line 17
Process exited with code 255.

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