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<?php $a = 1; $a = null; var_dump($a); echo isset($a)? 'true' : 'false',"\n"; unset($a); var_dump($a); echo isset($a)? 'true' : 'false',"\n";
Output for git.master, git.master_jit, rfc.property-hooks
NULL false Warning: Undefined variable $a in /in/07kcK on line 7 NULL false

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