# collection格式化计算两个数组的数据 有如下两组数据分别代表去年的营收和今年的营收，求每个月的盈亏情况。 ``` $lastYear = [ 6345.75, 9839.45, 7134.60, 9479.50, 9928.0, 8652.00, 7658.40, 10245.40, 7889.40, 3892.40, 3638.40, 2339.40 ]; $thisYear = [ 6145.75, 6895.00, 3434.00, 9349350, 9478.60, 7652.80, 4758.40, 10945.40, 3689.40, 8992.40, 7588.40, 2239.40 ]; ``` ## 使用foreach ``` $profit = []; foreach($thisYear as $key => $monthly){ $profit[$key] = $monthly - $lastYear[$key]; } dd($profit); ``` ## 使用 [zip](/collections/zip.md)、[first](/collections/first.md)和[last](collections/last.md) ``` $profit = collect($thisYear)->zip($lastYear)->map(function($monthly){ return $monthly->first() - $monthly->last(); }); dd($profit); ```