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<?php function assign_foo($instance) { $instance->foo = 2; } final class Content { protected $data; public function __get(string $name) { return $this->data[$name]; } public function __set(string $name, mixed $value): void { if ($value === 1) { assign_foo($this); } else { $this->data[$name] = $value; } } } set_error_handler(function () { echo (new Exception)->getTraceAsString(); }); $content = new Content(); $content->foo = 1;
Output for git.master, git.master_jit, rfc.property-hooks
#0 /in/YtnAhT(4): {closure}(8192, 'Creation of dyn...', '/in/YtnAhT', 4) #1 /in/YtnAhT(16): assign_foo(Object(Content)) #2 /in/YtnAhT(28): Content->__set('foo', 1) #3 {main}

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