Laravel 对集合使用总和，平均，最小值或最大值进行统计计算
示例
集合还为您提供了一种进行简单统计计算的简便方法。
$books = [
['title' => 'The Pragmatic Programmer', 'price' => 20],
['title' => 'Continuous Delivery', 'price' => 30],
['title' => 'The Clean Coder', 'price' => 10],
]
$min = collect($books)->min('price'); //10
$max = collect($books)->max('price'); //30
$avg = collect($books)->avg('price'); //20
$sum = collect($books)->sum('price'); //60
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