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run code in 200+ php & hhvm versions
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<?php function r($node) { if (!is_array($node['val'])) { echo $node['val']; } else { foreach($node['val'] as $n) { r($n); } } } $a = array('val'=>array(array('val'=>2), array('val'=>1))); r($a);
Output for 4.3.0 - 7.1.7
21