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<?php error_reporting(E_ALL); $foo = array('bar' => array('baz' => 5)); $bar = array('box' => 'baz'); var_dump(isset($foo['bar'][$bar['boom']]));
Output for rfc.property-hooks, git.master, git.master_jit
Warning: Undefined array key "boom" in /in/srm5f on line 5 bool(false)

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