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<?php error_reporting(0); $undef; $undef2 = null; $undef3 = null; unset($undef3); echo '$undef === $undef2?'; var_dump($undef === $undef2); echo '$undef === $undef3?'; var_dump($unedf === $undef3); echo '$undef2 === $undef3?'; var_dump($undef2 === $undef3); get_defined_vars();
Output for git.master, git.master_jit, rfc.property-hooks
$undef === $undef2?bool(true) $undef === $undef3?bool(true) $undef2 === $undef3?bool(true)

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