The count function counts the number of elements in an array, so you would expect $elems to equal 3 in the example.

count函数统计数组中的元素个数，所以在本例中 $elems应该等于3。

youdao

The count function counts the number of elements in an array, so you would expect $elems to equal 3 in the example.

count函数统计数组中的元素个数，所以在本例中 $elems应该等于3。

youdao