How can including files in PHP lead to errors, and what is the best practice for including files?

Including files in PHP can lead to errors if the path to the included file is incorrect or if the file does not exist. To avoid these errors, it is best practice to use the `__DIR__` constant along with `dirname(__FILE__)` to get the absolute path of the current directory and then concatenate it with the relative path of the file you want to include. 

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

Keywords

include require include_once require_once file path errors

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