回答編集履歴
1
質問者より先進verでの別解
test
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@@ -45,3 +45,49 @@
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合算したいcollectionが3つ以上あったら、
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`$merge = collect([$collection_a, $collection_b]);` に増やしていけばよいです。
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##### 追記：参考
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laravel5.8からは `mergeRecursive` があります
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[laravel5.8 - mergeRecursive](https://readouble.com/laravel/5.8/ja/collections.html#method-mergerecursive)
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同じキーごとにまとめてくれる。
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```php
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>>> $collection_a = collect (['price' => 300.0]);
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>>> $collection_b = collect (['price' => 1200.0]);
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>>> $merge = $collection_a->mergeRecursive($collection_b);
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=> Illuminate\Support\Collection {
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all: [
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"price" => [
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1200.0,
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300.0,
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],
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],
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}
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>>> $sum_price = array_sum($merge['price']);
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=> 1500.0
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```
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