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<?php $arr=array('3'=>array("a","b","c"),'4'=>array("d","e")); echo "<pre>";print_r(array_merge(array_values($arr)));
Output for 4.3.0 - 7.1.0
<pre>Array ( [0] => Array ( [0] => a [1] => b [2] => c ) [1] => Array ( [0] => d [1] => e ) )