What are the potential issues when including PHP files from subdirectories in a project?

When including PHP files from subdirectories in a project, potential issues can arise with file paths. To solve this, it's important to use the correct path when including files. One way to ensure this is by using the `__DIR__` magic constant to get the absolute path of the current file and then concatenate the relative path to the included file. 

include __DIR__ . '/subdirectory/file.php';

Keywords

include PHP files subdirectories path resolution namespace conflict

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