腾讯QQ微博API接口获取微博内容(4)

$found = array();
        foreach($found_keys as $k=>$v)
            $found[] = $this->dom->nodes[$k];

// return nth-element or array
        if (is_null($idx)) return $found;
  else if ($idx<0) $idx = count($found) + $idx;
        return (isset($found[$idx])) ? $found[$idx] : null;
    }

// seek for given conditions
    protected function seek($selector, &$ret) {
        list($tag, $key, $val, $exp, $no_key) = $selector;

// xpath index
        if ($tag && $key && is_numeric($key)) {
            $count = 0;
            foreach ($this->children as $c) {
                if ($tag==='*' || $tag===$c->tag) {
                    if (++$count==$key) {
                        $ret[$c->_[HDOM_INFO_BEGIN]] = 1;
                        return;
                    }
                }
            }
            return;
        }

$end = (!empty($this->_[HDOM_INFO_END])) ? $this->_[HDOM_INFO_END] : 0;
        if ($end==0) {
            $parent = $this->parent;
            while (!isset($parent->_[HDOM_INFO_END]) && $parent!==null) {
                $end -= 1;
                $parent = $parent->parent;
            }
            $end += $parent->_[HDOM_INFO_END];
        }

for($i=$this->_[HDOM_INFO_BEGIN]+1; $i<$end; ++$i) {
            $node = $this->dom->nodes[$i];
            $pass = true;

if ($tag==='*' && !$key) {
                if (in_array($node, $this->children, true))
                    $ret[$i] = 1;
                continue;
            }

// compare tag
            if ($tag && $tag!=$node->tag && $tag!=='*') {$pass=false;}
            // compare key
            if ($pass && $key) {
                if ($no_key) {
                    if (isset($node->attr[$key])) $pass=false;
                }
                else if (!isset($node->attr[$key])) $pass=false;
            }
            // compare value
            if ($pass && $key && $val  && $val!=='*') {
                $check = $this->match($exp, $val, $node->attr[$key]);
                // handle multiple class
                if (!$check && strcasecmp($key, 'class')===0) {
                    foreach(explode(' ',$node->attr[$key]) as $k) {
                        $check = $this->match($exp, $val, $k);
                        if ($check) break;
                    }
                }
                if (!$check) $pass = false;
            }
            if ($pass) $ret[$i] = 1;
            unset($node);
        }
    }