Concerned about how PHP identifies the paths ./ and / in Windows environment?

Question

< /p>

< /p>

Why do you need to add . to have an effect?

< /p>

Answer 1

/ is the root directory. Using is_dir() in php to judge always returns false
, but it is possible to read this directory, such as:

$dir=opendir("/");
while(($tem=readdir($dir))!==false){
  echo $tem,"<br>";
}

Can read the root directory of all hard disks.

In ThinkPHP 3.2, the single entry file: index.php is placed in the root directory of the website. This root directory is not the same as the hard disk root directory mentioned earlier.

Because it is a single entry, the "./" current directory in the controller is actually relative to index.php.

Answer 2

./ self
../ parent
/ root directory
That’s how I remember

Answer 3

./Start from the current directory

/ is calculated from the root directory

Answer 4

• /代表根目录 ，比如目录结构 /var/www/html,当前目录是 html下，那么输入 命令 cd /，当前目录切换到 根目录.

• ./ 代表当前目录，当前处于 html 下，输入 cd ./, the current directory remains unchanged.

• ../ 代表父级目录，当前处于 html 下，输入 cd ../,切换后的目录为 /var/www.