dirname()是一个用于获取指定路径的目录路径部分的函数。它返回给定路径中的目录部分，可以排除文件名或者其他非目录部分。使用dirname()函数可以帮助我们在处理文件路径时更加方便和高效。无论在Linux还是Windows系统中，都可以使用这个函数来获取目录路径。
Understanding dirname() Function in PHP
The dirname() function in PHP is used to extract the directory name from the specified path string. It returns the parent directory of the path if it exists, otherwise, it returns a dot character indicating the current directory.
The syntax of dirname() function is as follows:
Syntax:
dirname(pathString);
Parameters:
The dirname() function accepts a single parameter, which is a path string. This parameter specifies the path to the file or directory whose parent directory name needs to be extracted.
Return Value:
The dirname() function returns the parent directory of the specified path. If the specified path does not have a parent directory, such as a root directory, it returns a dot character indicating the current directory.
Examples:
Here are some examples of the dirname() function:
Example 1:
Suppose we have a file named ‘example.php’ located in the ‘C:\xampp\htdocs\project\folder’ directory. The following code shows how to extract the parent directory of this file:
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“`
The output of the above code will be:
“`
C:\xampp\htdocs\project\folder
“`
Example 2:
Suppose we have a directory named ‘folder’ located in the ‘C:\xampp\htdocs\project’ directory. The following code shows how to extract the parent directory of this directory:
“`
“`
The output of the above code will be:
“`
C:\xampp\htdocs\project
“`
Example 3:
Suppose we have a file named ‘index.php’ located in the root directory of the web server. The following code shows how to extract the parent directory of this file:
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“`
The output of the above code will be:
“`
/
“`
Example 4:
Suppose we want to extract the parent directory of the current file. The following code shows how to do this:
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“`
The output of the above code will be the parent directory of the current file.
Conclusion:
dirname() function is a very useful function in PHP when it comes to dealing with file and directory paths. It extracts the parent directory of the specified path and returns it as a string. It is very straightforward to use and can be used in a variety of scenarios.
