请告诉我为什么将空数组写入变量

Question

$January = $articles->whereMonth('updated_at','01')
  ->whereYear('updated_at', $year)
  ->get();

$February = $articles->whereMonth('updated_at','02')
  ->whereYear('updated_at', $year)
  ->get();

如果$January中没有数据，则将空数组写入$February，而不考虑数据的可用性。告诉我如何解决它，为什么会这样？

Answer 1

之前有类似的question回答

您需要像这样在clone上使用$articles：

$January = (clone $articles)->whereMonth('updated_at','01')
  ->whereYear('updated_at', $year)
  ->get();

$February = (clone $articles)->whereMonth('updated_at','02')
  ->whereYear('updated_at', $year)
  ->get();