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pathinfo() provides various information like dirname, basename, extension, and full filename. You can get intended result by pathinfo( $filename)['dirname']

Followings are the example to get file path:

$path_parts = pathinfo('/www/htdocs/inc/');

echo $path_parts['dirname'], "\n";
echo $path_parts['basename'], "\n";
echo $path_parts['extension'], "\n";
echo $path_parts['filename'], "\n"; // since PHP 5.2.0

Below is the result as an example for above: