为什么每当我使用 scandir() 时，我都会在数组的开头收到句点?

Why is it whenever I use scandir() I receive periods at the beginning of the array?

Array
(
    [0] => .
    [1] => ..
    [2] => bar.php
    [3] => foo.txt
    [4] => somedir
)
Array
(
    [0] => somedir
    [1] => foo.txt
    [2] => bar.php
    [3] => ..
    [4] => .
)

推荐答案

那些是当前 (.) 和父 (..) 目录.它们存在于所有目录中，用于引用目录本身及其直接父目录.