Text_Diff_Renderer_inline::_splitOnWords

    function _splitOnWords($string, $newlineEscape = "\n")
    {
        // Ignore \0; otherwise the while loop will never finish.
        $string = str_replace("\0", '', $string);

        $words = array();
        $length = strlen($string);
        $pos = 0;

        while ($pos < $length) {
            // Eat a word with any preceding whitespace.
            $spaces = strspn(substr($string, $pos), " \n");
            $nextpos = strcspn(substr($string, $pos + $spaces), " \n");
            $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
            $pos += $spaces + $nextpos;
        }

        return $words;
    }