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。

$last_year = [
    6345.75, 9839.45, 7134.60, 9479.50, 9928.0, 8652.00, 7658.40, 10245.40, 7889.40, 3892.40, 3638.40, 2339.40
];
$this_year = [
    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

$last_year = [
    6345.75, 9839.45, 7134.6, 9479.5, 9928.0, 8652.0, 7658.4, 10245.4, 7889.4, 3892.4, 3638.4, 2339.4,
];
$this_year = [
    6145.75, 6895.0, 3434.0, 9349350, 9478.6, 7652.8, 4758.4, 10945.4, 3689.4, 8992.4, 7588.4, 2239.4,
];

$profit = [];

foreach ($this_year as $key => $monthly) {
  $profit[$key] = $monthly - $last_year[$key];
}
dd($profit);

/**
array:12 [
  0 => -200.0
  1 => -2944.45
  2 => -3700.6
  3 => 9339870.5
  4 => -449.4
  5 => -999.2
  6 => -2900.0
  7 => 700.0
  8 => -4200.0
  9 => 5100.0
  10 => 3950.0
  11 => -100.0
]
*/

使用 zip、first 和 last 方法

$last_year = [
    6345.75, 9839.45, 7134.6, 9479.5, 9928.0, 8652.0, 7658.4, 10245.4, 7889.4, 3892.4, 3638.4, 2339.4,
];
$this_year = [
    6145.75, 6895.0, 3434.0, 9349350, 9478.6, 7652.8, 4758.4, 10945.4, 3689.4, 8992.4, 7588.4, 2239.4,
];

$profit = collect($this_year)
  ->zip($last_year)
  ->map(fn ($monthly) => $monthly->first() - $monthly->last());

dd($profit);
/**
Illuminate\Support\Collection {#1144
  #items: array:12 [
    0 => -200.0
    1 => -2944.45
    2 => -3700.6
    3 => 9339870.5
    4 => -449.4
    5 => -999.2
    6 => -2900.0
    7 => 700.0
    8 => -4200.0
    9 => 5100.0
    10 => 3950.0
    11 => -100.0
  ]
}
*/