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<?php class Promise { public $value; public function __construct($value) { $this->value = $value; } public function when(callable $callable) { $callable($this->value); } } $promise = new Promise(new StdClass); var_dump($promise); $promise->when(function(&$when) { $when = 42; }); var_dump($promise);
Output for git.master, git.master_jit, rfc.property-hooks
object(Promise)#1 (1) { ["value"]=> object(stdClass)#2 (0) { } } object(Promise)#1 (1) { ["value"]=> int(42) }

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