I can `require_once DIR.'/folder.file.php';` on PHP file, but am unable to get the variable. Why would that ever happen?

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Both current_file.php and req_file.php are in the same directory and I\'m able to require_once __DIR__.\'/req_file.php\' within


                      
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I can `require_once __DIR__.'/folder.file.php';` on PHP file, but am unable to get the variable. Why would that ever happen?

I can `require_once DIR.'/folder.file.php';` on PHP file, but am unable to get the variable. Why would that ever happen?