php - 点斜杠对 PHP 包含调用有什么作用？

Question

一个。这是做什么的？

require ("./file.php");

B.与此相比？

require ("file.php");

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(它不是上一级目录..应该是)

require ("../file.php");

Answer 1

./是 当前 目录。它与 file.php 大致相同。 ，但在许多情况下(包括这个)它不检查 PHP 可能查找文件的任何标准位置，而是检查 仅 当前目录。

来自 PHP documentation (注意最后一句):

Files for including are first looked for in each include_path entry relative to the current working directory, and then in the directory of current script. E.g. if your include_path is libraries, current working directory is /www/, you included include/a.php and there is include "b.php" in that file, b.php is first looked in /www/libraries/ and then in /www/include/. If filename begins with ./ or ../, it is looked only in the current working directory.