[ticket/11362] Move phpbb_clean_path into a simple filesystem service

PHPBB3-11362

phpBB/includes/functions.php

@@ -1046,36 +1046,6 @@ else
 	}
 }
 
-/**
-* Eliminates useless . and .. components from specified path.
-*
-* @param string $path Path to clean
-* @return string Cleaned path
-*/
-function phpbb_clean_path($path)
-{
-	$exploded = explode('/', $path);
-	$filtered = array();
-	foreach ($exploded as $part)
-	{
-		if ($part === '.' && !empty($filtered))
-		{
-			continue;
-		}
-
-		if ($part === '..' && !empty($filtered) && $filtered[sizeof($filtered) - 1] !== '..')
-		{
-			array_pop($filtered);
-		}
-		else
-		{
-			$filtered[] = $part;
-		}
-	}
-	$path = implode('/', $filtered);
-	return $path;
-}
-
 // functions used for building option fields
 
 /**