回答編集履歴
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aa
test
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@@ -1,3 +1,51 @@
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```php
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<?php
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5
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$array = [
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[1 => 2],
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[2 => 3],
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[3 => 3],
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[1 => 5],
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[2 => 6],
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];
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$array2 = [];
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foreach ($array as $pair) {
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if (!isset($array2[key($pair)])) $array2[key($pair)] = 0;
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$array2[key($pair)] += current($pair);
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}
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var_export($array2);
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```
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----
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【別解】 最初から埋めておくのもあり
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1
49
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```php
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2
50
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3
51
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<?php
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1
変更
test
CHANGED
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@@ -1,7 +1,3 @@
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-
PHP7.x向け
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-
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-
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-
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1
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```php
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6
2
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7
3
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<?php
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@@ -24,11 +20,11 @@
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27
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-
$array2 =
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$array2 = array_fill_keys(array_map('key', $array), 0);
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foreach ($array as $pair) {
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-
$array2[key($pair)] =
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$array2[key($pair)] += current($pair);
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}
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