Are there any specific considerations to keep in mind when including files in PHP from different directory levels?

When including files in PHP from different directory levels, it is important to consider the relative path of the file you are including. To include a file from a different directory level, you can use the `__DIR__` or `dirname(__FILE__)` magic constants to get the absolute path and then concatenate the relative path to include the file correctly.

// Include a file from a different directory level
include __DIR__ . '/path/to/file.php';