<?php $c = new c(); var_dump(isset($c->a)); // no problem var_dump(isset($c->a->b)); // undefined index: a var_dump(isset($c->b->c)); // undefined index: b var_dump(isset($c->d['e'])); // undefined index: d class c { public $x = array(); public function __get($name) { return $this->__isset($name) ? $this->x[$name] : null; } public function __isset($name) { return isset($this->x[$name]); } } ?>
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