回答編集履歴
2
aa
answer
CHANGED
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@@ -9,6 +9,30 @@
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9
9
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[2 => 6],
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10
10
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];
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11
11
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12
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+
$array2 = [];
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13
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+
foreach ($array as $pair) {
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14
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+
if (!isset($array2[key($pair)])) $array2[key($pair)] = 0;
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15
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+
$array2[key($pair)] += current($pair);
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16
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+
}
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17
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+
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18
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+
var_export($array2);
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19
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+
```
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20
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+
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21
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+
----
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22
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+
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23
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+
【別解】 最初から埋めておくのもあり
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24
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+
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25
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+
```php
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26
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+
<?php
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27
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+
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28
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+
$array = [
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29
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[1 => 2],
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30
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[2 => 3],
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31
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[3 => 3],
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32
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+
[1 => 5],
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33
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[2 => 6],
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34
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+
];
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35
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+
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12
36
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$array2 = array_fill_keys(array_map('key', $array), 0);
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13
37
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foreach ($array as $pair) {
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14
38
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$array2[key($pair)] += current($pair);
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1
変更
answer
CHANGED
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@@ -1,5 +1,3 @@
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1
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-
PHP7.x向け
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2
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-
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3
1
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```php
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4
2
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<?php
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5
3
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@@ -11,9 +9,9 @@
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11
9
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[2 => 6],
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12
10
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];
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13
11
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14
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-
$array2 =
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12
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+
$array2 = array_fill_keys(array_map('key', $array), 0);
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15
13
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foreach ($array as $pair) {
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16
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-
$array2[key($pair)] =
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14
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+
$array2[key($pair)] += current($pair);
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17
15
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}
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18
16
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19
17
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var_export($array2);
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