core-bundle/src/Resources/contao/library/Contao/Controller.php
protected function eliminateNestedPaths($arrPaths)
	{
		$arrPaths = array_filter($arrPaths);

		if (empty($arrPaths) || !\is_array($arrPaths))
		{
			return array();
		}

		$nested = array();

		foreach ($arrPaths as $path)
		{
			$nested[] = preg_grep('/^' . preg_quote($path, '/') . '\/.+/', $arrPaths);
		}

		if (!empty($nested))
		{
			$nested = array_merge(...$nested);
		}

		return array_values(array_diff($arrPaths, $nested));
	}
protected function eliminateNestedPaths($arrPaths)
	{
		$arrPaths = array_filter($arrPaths);

		if (empty($arrPaths) || !\is_array($arrPaths))
		{
			return array();
		}

		$nested = array();

		foreach ($arrPaths as $path)
		{
			$nested[] = preg_grep('/^' . preg_quote($path, '/') . '\/.+/', $arrPaths);
		}

		if (!empty($nested))
		{
			$nested = array_merge(...$nested);
		}

		return array_values(array_diff($arrPaths, $nested));
	}
Take an array of file paths and eliminate the nested ones

@param array $arrPaths The array of file paths

@return array The file paths array without the nested paths