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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))); echo "<pre>";print_r(call_user_func_array('array_merge', $arr)); ;
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<pre>Array ( [0] => Array ( [0] => a [1] => b [2] => c ) [1] => Array ( [0] => d [1] => e ) ) <pre>Array ( [0] => a [1] => b [2] => c [3] => d [4] => e )

preferences:
307.84 ms | 406 KiB | 456 Q