腾讯QQ微博API接口获取微博内容(8)

// save dom as string
    function save($filepath='') {
        $ret = $this->root->innertext();
        if ($filepath!=='') file_put_contents($filepath, $ret);
        return $ret;
    }

// find dom node by css selector
    function find($selector, $idx=null) {
        return $this->root->find($selector, $idx);
    }

// clean up memory due to php5 circular references memory leak...
    function clear() {
        foreach($this->nodes as $n) {$n->clear(); $n = null;}
        if (isset($this->parent)) {$this->parent->clear(); unset($this->parent);}
        if (isset($this->root)) {$this->root->clear(); unset($this->root);}
        unset($this->doc);
        unset($this->noise);
    }

    function dump($show_attr=true) {
        $this->root->dump($show_attr);
    }

// prepare HTML data and init everything
    protected function prepare($str, $lowercase=true) {
        $this->clear();
        $this->doc = $str;
        $this->pos = 0;
        $this->cursor = 1;
        $this->noise = array();
        $this->nodes = array();
        $this->lowercase = $lowercase;
        $this->root = new simple_html_dom_node($this);
        $this->root->tag = 'root';
        $this->root->_[HDOM_INFO_BEGIN] = -1;
        $this->root->nodetype = HDOM_TYPE_ROOT;
        $this->parent = $this->root;
        // set the length of content
        $this->size = strlen($str);
        if ($this->size>0) $this->char = $this->doc[0];
    }

// parse html content
    protected function parse() {
        if (($s = $this->copy_until_char('<'))==='')
            return $this->read_tag();

// text
        $node = new simple_html_dom_node($this);
        ++$this->cursor;
        $node->_[HDOM_INFO_TEXT] = $s;
        $this->link_nodes($node, false);
        return true;
    }

// read tag info
    protected function read_tag() {
        if ($this->char!=='<') {
            $this->root->_[HDOM_INFO_END] = $this->cursor;
            return false;
        }
        $begin_tag_pos = $this->pos;
        $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next

// end tag
        if ($this->char==='https://www.jb51.net/') {
            $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
            $this->skip($this->token_blank_t);
            $tag = $this->copy_until_char('>');