PHP Group & add elements in array

Question

I have this array:

Array(
[0] => Array(
[type] =>
[base] => 10.0
[amount] => 0
)
[1] => Array(
[type] => 15.0
[base] => 12.0
[amount] => 1.8
)
[2] => Array(
[type] => 15.0
[base] => 12.0
[amount] => 1.8
)
[3] => Array(
[type] => 2.0
[base] => 12.0
[amount] => 0.24
)

How can I get below array with php? I need to group "types" adding "amount" & "amount", but omitting elements without type value

Array(
[0] => Array(
[type] => 15.0
[base] => 24.0
[amount] => 3.6
)
[1] => Array(
[type] => 2.0
[base] => 12.0
[amount] => 0.24
)
)

Are you really grouping or are you just tying to omit them? For example what happens if you have more than one array with the same type value but different amount values? — prodigitalson
– prodigitalson, Commented Feb 7, 2015 at 18:52

Aleksei Matiushkin · Accepted Answer · 2015-02-07 18:52:34Z

1

array_reduce comes to the rescue:

$result = array_reduce($array, function($memo, $item) {
    if (!isset($item['type'])) return $memo;
    if (!isset($memo['' . $item['type']])) { // first occurence
      $memo['' . $item['type']] = $item;
    } else {                                 // will sum
      $memo['' . $item['type']]['base'] += $item['base'];
      $memo['' . $item['type']]['amount'] += $item['amount'];
    }
    return $memo;
 }, array());

 var_dump(array_values($result));

answered Feb 7, 2015 at 18:52

Aleksei Matiushkin

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