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run code in 200+ php & hhvm versions
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<?php $f = array('9' => 'bar'); unset($f['j']); var_export($f); unset($f['j']['l']);
based on gAUQ9
Output for 5.0.0 - 7.2.0
array ( 9 => 'bar', )
Output for 4.3.0 - 4.4.9
array ( 9 => 'bar', ) Notice: Undefined index: j in /in/eEqEU on line 6