getcwd() 和 dirname(__FILE__) 之间的区别?我应该使用哪个? [英] Difference Between getcwd() and dirname(__FILE__) ? Which should I use?

问题描述

PHP 中的区别是什么

getcwd()目录名(__文件__)

当我从 CLI 回显时，它们都返回相同的结果

echo getcwd()."
";echo 目录名(__FILE__)."
";

返回:

/home/user/Desktop/testing//家/用户/桌面/测试/

哪个最好用?有关系吗?更高级的 PHP 开发人员更喜欢什么?

解决方案

__FILE__ 是一个 魔法常量 包含您正在执行的文件的完整路径.如果你在一个包含中，它的路径将是 __FILE__ 的内容.

所以有了这个设置:

/folder/random/foo.php

/folder/random/bar/bar.php

你得到这个输出:

/folder/random/文件夹/随机-------/文件夹/随机/文件夹/随机/条

所以 getcwd() 返回你开始执行的目录，而 dirname(__FILE__) 是文件相关的.

在我的网络服务器上，getcwd() 返回最初开始执行的文件的位置.使用 CLI，它与执行 pwd 时得到的结果相同.这由 CLI SAPI 文档 和评论支持在 getcwd 手册页上:

<块引用>

CLI SAPI 确实 - 与其他 SAPI 不同 - 不会自动将当前工作目录更改为启动脚本所在的目录.

所以喜欢:

thom@griffin/home/thom $ echo "<?php echo getcwd() . '
' ?>">>测试.phpthom@griffin/home/thom $ php test.php/家/汤姆thom@griffin/home/thom $ cd ..汤姆@格里芬/home $ php 汤姆/test.php/家

当然，也请参见http://php.net/manual/en/function.getcwd.php

UPDATE:自 PHP 5.3.0 起，您还可以使用魔术常量 __DIR__，它等效于 dirname(__FILE__).>

In PHP what is the difference between

getcwd()
dirname(__FILE__)

They both return the same result when I echo from CLI

echo getcwd()."
";
echo dirname(__FILE__)."
";

Returns:

/home/user/Desktop/testing/
/home/user/Desktop/testing/

Which is the best one to use? Does it matter? What to the more advanced PHP developers prefer?

解决方案

__FILE__ is a magic constant containing the full path to the file you are executing. If you are inside an include, its path will be the contents of __FILE__.

So with this setup:

/folder/random/foo.php

<?php
echo getcwd() . "
";
echo dirname(__FILE__) . "
" ;
echo "-------
";
include 'bar/bar.php';

/folder/random/bar/bar.php

<?php
echo getcwd() . "
";
echo dirname(__FILE__) . "
";

You get this output:

/folder/random
/folder/random
-------
/folder/random
/folder/random/bar

So getcwd() returns the directory where you started executing, while dirname(__FILE__) is file-dependent.

On my webserver, getcwd() returns the location of the file that originally started executing. Using the CLI it is equal to what you would get if you executed pwd. This is supported by the documentation of the CLI SAPI and a comment on the getcwd manual page:

the CLI SAPI does - contrary to other SAPIs - NOT automatically change the current working directory to the one the started script resides in.

So like:

thom@griffin /home/thom $ echo "<?php echo getcwd() . '
' ?>" >> test.php
thom@griffin /home/thom $ php test.php 
/home/thom
thom@griffin /home/thom $ cd ..
thom@griffin /home $ php thom/test.php 
/home

Of course, see also the manual at http://php.net/manual/en/function.getcwd.php

UPDATE: Since PHP 5.3.0 you can also use the magic constant __DIR__ which is equivalent to dirname(__FILE__).

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