What is the significance of using __DIR__ when specifying the directory for required files in PHP?

Using __DIR__ when specifying the directory for required files in PHP is significant because it provides the absolute path to the current directory of the file. This ensures that the required files are included correctly regardless of the current working directory or the location of the script. It helps in avoiding issues related to file path resolution and makes the code more portable and reliable. 

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

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__DIR__ directory required files PHP significance

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