Online PHP editor | output for YQvGE

@ 2018-01-05T12:38:20Z

<?php
$array=array(
      0 => array(
         11 => 18.000,
         14 => 25.100,
         15 => 5.000,
         16 => 8.000,
         19 => 21.600
     ),
     1 => array(
         11 => 9.100,
         12 => 2.700,
         14 => 2.300,
         15 => 18.800,
         16 => 9.500,
         17 => 6.900,
         19 => 9.400
    ),
    2 => array(
        14 => 5.700
    ),
    3 => array(
       17 => 2.800,
       20 => 6.000
   ),
   4 => array(
       24 => 5.000,
       25 => 6.000,
       26 => 2.7
   ),
   5 => array(
       16 => 2.200
   ),
   6 => array(
      14 => 13.000,
      15 => 2.000,
      16 => 4.300,
      19 => 6.000
  ),
  7 => array(
      32 => 5.000,
      36 => 18.500
  )
 );
$result=[];
foreach($array as $subarray){
    $subarray=array_diff_key($subarray,$result);  // deny iteration of previously summed subarray keys
    foreach($subarray as $k=>$v){
        $result[$k]=array_sum(array_column($array,$k));  // sum the whole array's column
    }
}
var_export($result);

Output for 7.1.0 - 7.1.25, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: array ( 11 => 27.1, 14 => 46.1, 15 => 25.8, 16 => 24.0, 19 => 37.0, 12 => 2.7, 17 => 9.7, 20 => 6.0, 24 => 5.0, 25 => 6.0, 26 => 2.7, 32 => 5.0, 36 => 18.5, )
Output for 7.0.33: array ( 11 => 27.100000000000001, 14 => 46.100000000000001, 15 => 25.800000000000001, 16 => 24.0, 19 => 37.0, 12 => 2.7000000000000002, 17 => 9.6999999999999993, 20 => 6.0, 24 => 5.0, 25 => 6.0, 26 => 2.7000000000000002, 32 => 5.0, 36 => 18.5, )
Output for 5.6.38: array ( 11 => 27.100000000000001, 14 => 46.100000000000001, 15 => 25.800000000000001, 16 => 24, 19 => 37, 12 => 2.7000000000000002, 17 => 9.6999999999999993, 20 => 6, 24 => 5, 25 => 6, 26 => 2.7000000000000002, 32 => 5, 36 => 18.5, )

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