What are the best practices for including files in PHP that are located in higher directories?

When including files in PHP that are located in higher directories, it is important to use the correct relative path to ensure the file is included successfully. One common way to achieve this is by using the `__DIR__` magic constant to reference the current directory and navigate to the desired file location. 

include __DIR__ . '/../path/to/file.php';

Keywords

include require file path directory traversal security

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