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$January 中没有数据，则无论数据可用性如何，都会将一个空数组写入$February。告诉我如何解决它以及为什么会这样？

Answer 1

之前有类似的question回答过

您需要像这样在$articles 上使用clone：

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

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