How to check the path of php file

How to check the path of php file?

__FILE__ means the absolute path of the current file including the file name, dirname (__FILE__) represents the absolute path of the current file.

dirname(__FILE___) function returns the path where the script is located.

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

If b.php is referenced by the a.php file require or include in other directories.

The content of the variable $basedir is still the path to the folder where b.php is located.

Instead of becoming the directory where the a.php file is located.

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