titanscssc::matchExtends PHP Method

    protected function matchExtends($selector, &$out, $from = 0, $initial = true)
    {
        foreach ($selector as $i => $part) {
            if ($i < $from) {
                continue;
            }
            if ($this->matchExtendsSingle($part, $origin)) {
                $before = array_slice($selector, 0, $i);
                $after = array_slice($selector, $i + 1);
                foreach ($origin as $new) {
                    $k = 0;
                    // remove shared parts
                    if ($initial) {
                        foreach ($before as $k => $val) {
                            if (!isset($new[$k]) || $val != $new[$k]) {
                                break;
                            }
                        }
                    }
                    $result = array_merge($before, $k > 0 ? array_slice($new, $k) : $new, $after);
                    if ($result == $selector) {
                        continue;
                    }
                    $out[] = $result;
                    // recursively check for more matches
                    $this->matchExtends($result, $out, $i, false);
                    // selector sequence merging
                    if (!empty($before) && count($new) > 1) {
                        $result2 = array_merge(array_slice($new, 0, -1), $k > 0 ? array_slice($before, $k) : $before, array_slice($new, -1), $after);
                        $out[] = $result2;
                    }
                }
            }
        }
    }