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<?php trait Immutable { public function __set($name, $value) { throw new Exception("can't touch this, nah nah nuh nahhh"); } public function __get($name) { return $this->$name; } } class ImmutableThingy { use Immutable; protected $foo = 'bar'; } $thing = new ImmutableThingy; var_dump($thing, $thing->foo); $thing->poo = 'baz'; var_dump($thing, $thing->foo);
Output for git.master, git.master_jit, rfc.property-hooks
object(ImmutableThingy)#1 (1) { ["foo":protected]=> string(3) "bar" } string(3) "bar" Fatal error: Uncaught Exception: can't touch this, nah nah nuh nahhh in /in/dcPTQ:5 Stack trace: #0 /in/dcPTQ(23): ImmutableThingy->__set('poo', 'baz') #1 {main} thrown in /in/dcPTQ on line 5
Process exited with code 255.

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