getcwd()

(PHP 4, PHP 5, PHP 7)

取得当前工作目录

说明

取得当前工作目录。

返回值

成功则返回当前工作目录，失败返回FALSE。

在某些 Unix 的变种下，如果任何父目录没有设定可读或搜索模式，即使当前目录设定了，getcwd()还是会返回FALSE。有关模式与权限的更多信息见chmod()。

范例

Example #1getcwd()例子

以上例程的输出类似于：

/home/didou
/home/didou/cvs

参见

• chdir()改变目录
• chmod()改变文件模式

getcwd() returns the path of the "main" script referenced in the URL.
dirname(__FILE__) will return the path of the script currently executing.
I had written a script that required several class definition scripts from the same directory. It retrieved them based on filename matches and used getcwd to figure out where they were.
Didn't work so well when I needed to call that first script from a new file in a different directory.

Take care if you use getcwd() in file that you'll need to include (using include, require, or *_once) in a script located outside of the same directory tree. 
example: 


In the above example, the database connection will not be made because the call to getcwd() returns the path relative to the calling script ( /home/cron_user/maintenance_scripts ) NOT relative to the file where the getcwd() function is called.

I use this code to replicate the pushd and popd DOS commands in PHP:

This allows you to change the current directory with pushd, then use popd to "undo" the directory change when you're done.

It appears there is a change in functionality in PHP5 from PHP4 when using the CLI tool. Here is the example: -
cd /tmp
cat > foo.php 
END
cd /
php -q /tmp/foo.php
PHP4 returns /tmp
PHP5 returns /
Something to be aware of.

This function is often used in conjuction with basename(), i.e.
http://www.php.net/manual/en/function.basename.php

When running PHP on the command line, if you want to include another file which is in the same directory as the main script, doing just

might not work, if you run your script like this:
/$ /path/to/script.php
because the current working dir will be set to '/', and the file '/otherfile.php' does not exist, because it is in '/path/to/otherfile.php'.
So, to get the directory in which the script resides, you can use this function:

So you can use it like this:

Spent some time thinking this one out, maybe it helps someone :)

This is a function to convert a path which looks something like this:
/home/www/somefolder/../someotherfolder/../
To a proper directory path: