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

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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:

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$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/".]

The path of the b.php file is: "C:/root/www/b.php". Usage tips, if you repeat it, you can move the directory up a level: For example: $d = dirname(dirname(__FILE__)); In fact, you just give a directory as a parameter to dirname(). Because dirname() returns the last directory without \＼ or / Therefore, when reused, it can be considered that dirname() treats the lowest directory as a file name. Return as usual The upper-level directory of the current directory. Repeat this to get its upper-level directory. Include the file that gets the upper-level directory include(dirname(__FILE__).'/../filename.php'); 2. How to combine PHP files with html files

The code is as follows	Copy code
if($reguser != "" ){ echo"Submit Photo "; echo "Log Out"; }else{ echo"Login"; } ?>

http://www.bkjia.com/PHPjc/445633.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445633.htmlTechArticleIn php, dirname() and __FILE__ are our constants. This article will introduce dirname() to you in detail. Interested friends can refer to some matters related to the use of __FILE__ constant. dirn...