<?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);
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