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run code in 300+ PHP versions simultaneously
<?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)); ;

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35.65 ms | 402 KiB | 5 Q