What are some best practices for determining the absolute server path in PHP?

When determining the absolute server path in PHP, it is important to use the `__DIR__` magic constant to get the directory of the current script. This ensures that the path is always accurate regardless of where the script is located in the file system. Additionally, you can use `realpath()` function to resolve any symbolic links and get the absolute path.

$absolutePath = realpath(__DIR__);
echo $absolutePath;