Application of php dirname(__FILE__) and __FILE__ constant_PHP tutorial

In php, dirname() and __FILE__ are our constants. This article will give you a detailed introduction to some matters in the use of dirname() and __FILE__ constants. Friends who are interested can refer to them. ​

dirname() function

string dirname ( string $path )

Given a string containing the full path to a file, this function returns the directory name after removing the file name.

In Windows, both slash (/) and backslash () can be used as directory separators. In other circumstances it is a slash (/).

Example #1 dirname() Example

Example

The code is as follows	Copy code
代码如下 复制代码 echo dirname("c:/testweb/home.php"); echo dirname("/testweb/home.php"); ?> 输出： c:/testweb /testweb echo dirname("c:/testweb/home.php"); echo dirname("/testweb/home.php"); ?> Output: c:/testweb /testweb

__FILE__

代码如下	复制代码
$basedir = dirname(__FILE__); echo $basedir //将在页面打印出一个这个文件所在绝对路径! ?>

The full path and file name of the file. If used in an included file, returns the included file name

dirname(__file__)

__FILE__: Known as PHP magic constant, returns the full path and file name of the currently executing PHP script, including an absolute path

1) The dirname(__FILE__) function returns the path where the script is located. Update network

For example, the file b.php contains the following content:

The code is as follows	Copy code
$basedir = dirname(__FILE__); echo $basedir //The absolute path where this file is located will be printed out on the page! ?>

The test I did got the result: E:websiteothertestcms

dirname(__FILE__) generally returns a directory structure from the current directory where the file is located to the system root directory.

The current file name will not be returned.

代码如下	复制代码
if($reguser != ""){ echo"Submit Photo "; echo"Log Out"; }else{ echo"Login"; } ?>

dirname(__FILE__) may also return a . (current directory)
[The reason is that the b.php file is in http.conf or the default WEB directory of the PHP configuration development environment. For example, WEB_ROOT is: "C:/root/www/".]

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