Including file from nested directory is simple and straight forward while being at root directory, but for including files in php in nested directories beginners claim that they have did everything perfectly right but the file didn’t get called.
Following are the few cases for nested file calls,
1) ./ within the same folder e.g. currently in folder1/file1.php and want to access folder1/file2.php
2) ../ with the depth of one level e.g. currently in folder1/folder1.1/file3.php and want to access folder1/file2.php
3) ../../ with the depth of two levels e.g. currently in folder2/folder2.4/folder2.4.5/file4.php and want to access folder2/file5.php
4) ../../../ with the depth of three levels e.g. currently in folder5/folder5.3/folder5.3.1/folder220.127.116.11/file6.php and want to access folder5/file7.php
Thats it 🙂