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<?php $your_array = array( 0 => Array ( 'd1' => Array ( 4 ), 'd2' => Array ( 3 ) ), 1 => Array ( 'd1' => Array ( 1 ), 'd2' => Array ( 2 ) ) ); $result['d1'] = call_user_func_array('array_merge',array_column($your_array,'d1')); $result['d2'] = call_user_func_array('array_merge',array_column($your_array,'d2')); print_r($result);

preferences:
30.06 ms | 406 KiB | 5 Q