直接看代码吧。

// helper functions
// -----------------------------------------------------------------------------
// get html dom form file
function file_get_html() {
    $dom = new simple_html_dom;
    $args = func_get_args();
    $dom->load(call_user_func_array(\'file_get_contents\', $args), true);
    return $dom;
}

// get html dom form string
function str_get_html($str, $lowercase=true) {
    $dom = new simple_html_dom;
    $dom->load($str, $lowercase);
    return $dom;
}

// dump html dom tree
function dump_html_tree($node, $show_attr=true, $deep=0) {
    $lead = str_repeat(\'    \', $deep);
    echo $lead.$node->tag;
    if ($show_attr && count($node->attr)>0) {
        echo \'(\';
        foreach($node->attr as $k=>$v)
            echo \"[$k]=>\\\"\".$node->$k.\'\", \';
        echo \')\';
    }
    echo \"\\n\";

    foreach($node->nodes as $c)
        dump_html_tree($c, $show_attr, $deep+1);
}

// get dom form file (dePRecated)
function file_get_dom() {
    $dom = new simple_html_dom;
    $args = func_get_args();
    $dom->load(call_user_func_array(\'file_get_contents\', $args), true);
    return $dom;
}

// get dom form string (deprecated)
function str_get_dom($str, $lowercase=true) {
    $dom = new simple_html_dom;
    $dom->load($str, $lowercase);
    return $dom;
}

// simple html dom node
// -----------------------------------------------------------------------------
class simple_html_dom_node {
    public $nodetype = HDOM_TYPE_TEXT;
    public $tag = \'text\';
    public $attr = array();
    public $children = array();
    public $nodes = array();
    public $parent = null;
    public $_ = array();
    private $dom = null;

    function __construct($dom) {
        $this->dom = $dom;
        $dom->nodes[] = $this;
    }

    function __destruct() {
        $this->clear();
    }

    function __toString() {
        return $this->outertext();
    }

    // clean up memory due to php5 circular references memory leak...
    function clear() {
        $this->dom = null;
        $this->nodes = null;
        $this->parent = null;
        $this->children = null;
    }

    // dump node\'s tree
    function dump($show_attr=true) {
        dump_html_tree($this, $show_attr);
    }

    // returns the parent of node
    function parent() {
        return $this->parent;
    }

    // returns children of node
    function children($idx=-1) {
        if ($idx===-1) return $this->children;
        if (isset($this->children[$idx])) return $this->children[$idx];
        return null;
    }

    // returns the first child of node
    function first_child() {
        if (count($this->children)>0) return $this->children[0];
        return null;
    }

    // returns the last child of node
    function last_child() {
        if (($count=count($this->children))>0) return $this->children[$count-1];
        return null;
    }

    // returns the next sibling of node   
    function next_sibling() {
        if ($this->parent===null) return null;
        $idx = 0;
        $count = count($this->parent->children);
        while ($idx<$count && $this!==$this->parent->children[$idx])
            ++$idx;
        if (++$idx>=$count) return null;
        return $this->parent->children[$idx];
    }

    // returns the previous sibling of node
    function prev_sibling() {
        if ($this->parent===null) return null;
        $idx = 0;
        $count = count($this->parent->children);
        while ($idx<$count && $this!==$this->parent->children[$idx])
            ++$idx;
        if (--$idx<0) return null;
        return $this->parent->children[$idx];
    }

    // get dom node\'s inner html
    function innertext() {
        if (isset($this->_[HDOM_INFO_INNER])) return $this->_[HDOM_INFO_INNER];
        if (isset($this->_[HDOM_INFO_TEXT])) return $this->dom->restore_noise($this->_[HDOM_INFO_TEXT]);

        $ret = \'\';
        foreach($this->nodes as $n)
            $ret .= $n->outertext();
        return $ret;
    }

    // get dom node\'s outer text (with tag)
    function outertext() {
        if ($this->tag===\'root\') return $this->innertext();

        // trigger callback
        if ($this->dom->callback!==null)
            call_user_func_array($this->dom->callback, array($this));

        if (isset($this->_[HDOM_INFO_OUTER])) return $this->_[HDOM_INFO_OUTER];
        if (isset($this->_[HDOM_INFO_TEXT])) return $this->dom->restore_noise($this->_[HDOM_INFO_TEXT]);

        // render begin tag
        $ret = $this->dom->nodes[$this->_[HDOM_INFO_BEGIN]]->makeup();

        // render inner text
        if (isset($this->_[HDOM_INFO_INNER]))
            $ret .= $this->_[HDOM_INFO_INNER];
        else {
            foreach($this->nodes as $n)
                $ret .= $n->outertext();
        }

        // render end tag
        if(isset($this->_[HDOM_INFO_END]) && $this->_[HDOM_INFO_END]!=0)
            $ret .= \'</\'.$this->tag.\'>\';
        return $ret;
    }

    // get dom node\'s plain text
    function text() {
        if (isset($this->_[HDOM_INFO_INNER])) return $this->_[HDOM_INFO_INNER];
        switch ($this->nodetype) {
            case HDOM_TYPE_TEXT: return $this->dom->restore_noise($this->_[HDOM_INFO_TEXT]);
            case HDOM_TYPE_COMMENT: return \'\';
            case HDOM_TYPE_UNKNOWN: return \'\';
        }
        if (strcasecmp($this->tag, \'script\')===0) return \'\';
        if (strcasecmp($this->tag, \'style\')===0) return \'\';

        $ret = \'\';
        foreach($this->nodes as $n)
            $ret .= $n->text();
        return $ret;
    }

    function xmltext() {
        $ret = $this->innertext();
        $ret = str_ireplace(\'<![CDATA[\', \'\', $ret);
        $ret = str_replace(\']]>\', \'\', $ret);
        return $ret;
    }

    // build node\'s text with tag
    function makeup() {
        // text, comment, unknown
        if (isset($this->_[HDOM_INFO_TEXT])) return $this->dom->restore_noise($this->_[HDOM_INFO_TEXT]);

        $ret = \'<\'.$this->tag;
        $i = -1;

        foreach($this->attr as $key=>$val) {
            ++$i;

            // skip removed attribute
            if ($val===null || $val===false)
                continue;

            $ret .= $this->_[HDOM_INFO_SPACE][$i][0];
            //no value attr: nowrap, checked selected...
            if ($val===true)
                $ret .= $key;
            else {
                switch($this->_[HDOM_INFO_QUOTE][$i]) {
                    case HDOM_QUOTE_DOUBLE: $quote = \'\"\'; break;
                    case HDOM_QUOTE_SINGLE: $quote = \'\\\'\'; break;
                    default: $quote = \'\';
                }
                $ret .= $key.$this->_[HDOM_INFO_SPACE][$i][1].\'=\'.$this->_[HDOM_INFO_SPACE][$i][2].$quote.$val.$quote;
            }
        }
        $ret = $this->dom->restore_noise($ret);
        return $ret . $this->_[HDOM_INFO_ENDSPACE] . \'>\';
    }

    // find elements by CSS selector
    function find($selector, $idx=null) {
        $selectors = $this->parse_selector($selector);
        if (($count=count($selectors))===0) return array();
        $found_keys = array();

        // find each selector
        for ($c=0; $c<$count; ++$c) {
            if (($levle=count($selectors[0]))===0) return array();
            if (!isset($this->_[HDOM_INFO_BEGIN])) return array();

            $head = array($this->_[HDOM_INFO_BEGIN]=>1);

            // handle descendant selectors, no recursive!
            for ($l=0; $l<$levle; ++$l) {
                $ret = array();
                foreach($head as $k=>$v) {
                    $n = ($k===-1) ? $this->dom->root : $this->dom->nodes[$k];
                    $n->seek($selectors[$c][$l], $ret);
                }
                $head = $ret;
            }

            foreach($head as $k=>$v) {
                if (!isset($found_keys[$k]))
                    $found_keys[$k] = 1;
            }
        }

        // sort keys
        ksort($found_keys);

        $found = array();
        foreach($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);
        }
    }

    protected function match($exp, $pattern, $value) {
        switch ($exp) {
            case \'=\':
                return ($value===$pattern);
            case \'!=\':
                return ($value!==$pattern);
            case \'^=\':
                return preg_match(\"/^\".preg_quote($pattern,\'/\').\"/\", $value);
            case \'$=\':
                return preg_match(\"/\".preg_quote($pattern,\'/\').\"$/\", $value);
            case \'*=\':
                if ($pattern[0]==\'/\')
                    return preg_match($pattern, $value);
                return preg_match(\"/\".$pattern.\"/i\", $value);
        }
        return false;
    }

    protected function parse_selector($selector_string) {
        // pattern of CSS selectors, modified from mootools
        $pattern = \"/([\\w-:\\*]*)(?:\\#([\\w-]+)|\\.([\\w-]+))?(?:\\[@?(!?[\\w-]+)(?:([!*^$]?=)[\\\"\']?(.*?)[\\\"\']?)?\\])?([\\/, ]+)/is\";
        preg_match_all($pattern, trim($selector_string).\' \', $matches, PREG_SET_ORDER);
        $selectors = array();
        $result = array();
        //print_r($matches);

        foreach ($matches as $m) {
            $m[0] = trim($m[0]);
            if ($m[0]===\'\' || $m[0]===\'/\' || $m[0]===\'//\') continue;
            // for borwser grnreated xpath
            if ($m[1]===\'tbody\') continue;

            list($tag, $key, $val, $exp, $no_key) = array($m[1], null, null, \'=\', false);
            if(!empty($m[2])) {$key=\'id\'; $val=$m[2];}
            if(!empty($m[3])) {$key=\'class\'; $val=$m[3];}
            if(!empty($m[4])) {$key=$m[4];}
            if(!empty($m[5])) {$exp=$m[5];}
            if(!empty($m[6])) {$val=$m[6];}

            // convert to lowercase
            if ($this->dom->lowercase) {$tag=strtolower($tag); $key=strtolower($key);}
            //elements that do NOT have the specified attribute
            if (isset($key[0]) && $key[0]===\'!\') {$key=substr($key, 1); $no_key=true;}

            $result[] = array($tag, $key, $val, $exp, $no_key);
            if (trim($m[7])===\',\') {
                $selectors[] = $result;
                $result = array();
            }
        }
        if (count($result)>0)
            $selectors[] = $result;
        return $selectors;
    }

    function __get($name) {
        if (isset($this->attr[$name])) return $this->attr[$name];
        switch($name) {
            case \'outertext\': return $this->outertext();
            case \'innertext\': return $this->innertext();
            case \'plaintext\': return $this->text();
            case \'xmltext\': return $this->xmltext();
            default: return array_key_exists($name, $this->attr);
        }
    }

    function __set($name, $value) {
        switch($name) {
            case \'outertext\': return $this->_[HDOM_INFO_OUTER] = $value;
            case \'innertext\':
                if (isset($this->_[HDOM_INFO_TEXT])) return $this->_[HDOM_INFO_TEXT] = $value;
                return $this->_[HDOM_INFO_INNER] = $value;
        }
        if (!isset($this->attr[$name])) {
            $this->_[HDOM_INFO_SPACE][] = array(\' \', \'\', \'\');
            $this->_[HDOM_INFO_QUOTE][] = HDOM_QUOTE_DOUBLE;
        }
        $this->attr[$name] = $value;
    }

    function __isset($name) {
        switch($name) {
            case \'outertext\': return true;
            case \'innertext\': return true;
            case \'plaintext\': return true;
        }
        //no value attr: nowrap, checked selected...
        return (array_key_exists($name, $this->attr)) ? true : isset($this->attr[$name]);
    }

    function __unset($name) {
        if (isset($this->attr[$name]))
            unset($this->attr[$name]);
    }

    // camel naming conventions
    function getAllAttributes() {return $this->attr;}
    function getAttribute($name) {return $this->__get($name);}
    function setAttribute($name, $value) {$this->__set($name, $value);}
    function hasAttribute($name) {return $this->__isset($name);}
    function removeAttribute($name) {$this->__set($name, null);}
    function getElementById($id) {return $this->find(\"#$id\", 0);}
    function getElementsById($id, $idx=null) {return $this->find(\"#$id\", $idx);}
    function getElementByTagName($name) {return $this->find($name, 0);}
    function getElementsByTagName($name, $idx=null) {return $this->find($name, $idx);}
    function parentNode() {return $this->parent();}
    function childNodes($idx=-1) {return $this->children($idx);}
    function firstChild() {return $this->first_child();}
    function lastChild() {return $this->last_child();}
    function nextSibling() {return $this->next_sibling();}
    function previousSibling() {return $this->prev_sibling();}
}

// simple html dom parser
// -----------------------------------------------------------------------------
class simple_html_dom {
    public $root = null;
    public $nodes = array();
    public $callback = null;
    public $lowercase = false;
    protected $pos;
    protected $doc;
    protected $char;
    protected $size;
    protected $cursor;
    protected $parent;
    protected $noise = array();
    protected $token_blank = \" \\t\\r\\n\";
    protected $token_equal = \' =/>\';
    protected $token_slash = \" />\\r\\n\\t\";
    protected $token_attr = \' >\';
    // use isset instead of in_array, performance boost about 30%...
    protected $self_closing_tags = array(\'img\'=>1, \'br\'=>1, \'input\'=>1, \'meta\'=>1, \'link\'=>1, \'hr\'=>1, \'base\'=>1, \'embed\'=>1, \'spacer\'=>1);
    protected $block_tags = array(\'root\'=>1, \'body\'=>1, \'form\'=>1, \'div\'=>1, \'span\'=>1, \'table\'=>1);
    protected $optional_closing_tags = array(
        \'tr\'=>array(\'tr\'=>1, \'td\'=>1, \'th\'=>1),
        \'th\'=>array(\'th\'=>1),
        \'td\'=>array(\'td\'=>1),
        \'li\'=>array(\'li\'=>1),
        \'dt\'=>array(\'dt\'=>1, \'dd\'=>1),
        \'dd\'=>array(\'dd\'=>1, \'dt\'=>1),
        \'dl\'=>array(\'dd\'=>1, \'dt\'=>1),
        \'p\'=>array(\'p\'=>1),
        \'nobr\'=>array(\'nobr\'=>1),
    );

    function __construct($str=null) {
        if ($str) {
            if (preg_match(\"/^http:\\/\\//i\",$str) || is_file($str))
                $this->load_file($str);
            else
                $this->load($str);
        }
    }
    http://www.devdao.com/
    function __destruct() {
        $this->clear();
    }

    // load html from string
    function load($str, $lowercase=true) {
        // prepare
        $this->prepare($str, $lowercase);
        // strip out comments
        $this->remove_noise(\"\'<!--(.*?)-->\'is\");
        // strip out cdata
        $this->remove_noise(\"\'<!\\[CDATA\\[(.*?)\\]\\]>\'is\", true);
        // strip out <style> tags
        $this->remove_noise(\"\'<\\s*style[^>]*[^/]>(.*?)<\\s*/\\s*style\\s*>\'is\");
        $this->remove_noise(\"\'<\\s*style\\s*>(.*?)<\\s*/\\s*style\\s*>\'is\");
        // strip out <script> tags
        $this->remove_noise(\"\'<\\s*script[^>]*[^/]>(.*?)<\\s*/\\s*script\\s*>\'is\");
        $this->remove_noise(\"\'<\\s*script\\s*>(.*?)<\\s*/\\s*script\\s*>\'is\");
        // strip out preformatted tags
        $this->remove_noise(\"\'<\\s*(?:code)[^>]*>(.*?)<\\s*/\\s*(?:code)\\s*>\'is\");
        // strip out server side scripts
        $this->remove_noise(\"\'(<\\?)(.*?)(\\?>)\'s\", true);
        // strip smarty scripts
        $this->remove_noise(\"\'(\\{\\w)(.*?)(\\})\'s\", true);

        // parsing
        while ($this->parse());
        // end
        $this->root->_[HDOM_INFO_END] = $this->cursor;
    }

    // load html from file
    function load_file() {
        $args = func_get_args();
        $this->load(call_user_func_array(\'file_get_contents\', $args), true);
    }

    // set callback function
    function set_callback($function_name) {
        $this->callback = $function_name;
    }

    // remove callback function
    function remove_callback() {
        $this->callback = null;
    }

    // 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===\'/\') {
            $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
            $this->skip($this->token_blank_t);
            $tag = $this->copy_until_char(\'>\');

            // skip attributes in end tag
            if (($pos = strpos($tag, \' \'))!==false)
                $tag = substr($tag, 0, $pos);

            $parent_lower = strtolower($this->parent->tag);
            $tag_lower = strtolower($tag);

            if ($parent_lower!==$tag_lower) {
                if (isset($this->optional_closing_tags[$parent_lower]) && isset($this->block_tags[$tag_lower])) {
                    $this->parent->_[HDOM_INFO_END] = 0;
                    $org_parent = $this->parent;

                    while (($this->parent->parent) && strtolower($this->parent->tag)!==$tag_lower)
                        $this->parent = $this->parent->parent;

                    if (strtolower($this->parent->tag)!==$tag_lower) {
                        $this->parent = $org_parent; // restore origonal parent
                        if ($this->parent->parent) $this->parent = $this->parent->parent;
                        $this->parent->_[HDOM_INFO_END] = $this->cursor;
                        return $this->as_text_node($tag);
                    }
                }
                else if (($this->parent->parent) && isset($this->block_tags[$tag_lower])) {
                    $this->parent->_[HDOM_INFO_END] = 0;
                    $org_parent = $this->parent;

                    while (($this->parent->parent) && strtolower($this->parent->tag)!==$tag_lower)
                        $this->parent = $this->parent->parent;

                    if (strtolower($this->parent->tag)!==$tag_lower) {
                        $this->parent = $org_parent; // restore origonal parent
                        $this->parent->_[HDOM_INFO_END] = $this->cursor;
                        return $this->as_text_node($tag);
                    }
                }
                else if (($this->parent->parent) && strtolower($this->parent->parent->tag)===$tag_lower) {
                    $this->parent->_[HDOM_INFO_END] = 0;
                    $this->parent = $this->parent->parent;
                }
                else
                    return $this->as_text_node($tag);
            }

            $this->parent->_[HDOM_INFO_END] = $this->cursor;
            if ($this->parent->parent) $this->parent = $this->parent->parent;

            $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
            return true;
        }

        $node = new simple_html_dom_node($this);
        $node->_[HDOM_INFO_BEGIN] = $this->cursor;
        ++$this->cursor;
        $tag = $this->copy_until($this->token_slash);

        // doctype, cdata & comments...
        if (isset($tag[0]) && $tag[0]===\'!\') {
            $node->_[HDOM_INFO_TEXT] = \'<\' . $tag . $this->copy_until_char(\'>\');

            if (isset($tag[2]) && $tag[1]===\'-\' && $tag[2]===\'-\') {
                $node->nodetype = HDOM_TYPE_COMMENT;
                $node->tag = \'comment\';
            } else {
                $node->nodetype = HDOM_TYPE_UNKNOWN;
                $node->tag = \'unknown\';
            }

            if ($this->char===\'>\') $node->_[HDOM_INFO_TEXT].=\'>\';
            $this->link_nodes($node, true);
            $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
            return true;
        }

        // text
        if ($pos=strpos($tag, \'<\')!==false) {
            $tag = \'<\' . substr($tag, 0, -1);
            $node->_[HDOM_INFO_TEXT] = $tag;
            $this->link_nodes($node, false);
            $this->char = $this->doc[--$this->pos]; // prev
            return true;
        }

        if (!preg_match(\"/^[\\w-:]+$/\", $tag)) {
            $node->_[HDOM_INFO_TEXT] = \'<\' . $tag . $this->copy_until(\'<>\');
            if ($this->char===\'<\') {
                $this->link_nodes($node, false);
                return true;
            }

            if ($this->char===\'>\') $node->_[HDOM_INFO_TEXT].=\'>\';
            $this->link_nodes($node, false);
            $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
            return true;
        }

        // begin tag
        $node->nodetype = HDOM_TYPE_ELEMENT;
        $tag_lower = strtolower($tag);
        $node->tag = ($this->lowercase) ? $tag_lower : $tag;

        // handle optional closing tags
        if (isset($this->optional_closing_tags[$tag_lower]) ) {
            while (isset($this->optional_closing_tags[$tag_lower][strtolower($this->parent->tag)])) {
                $this->parent->_[HDOM_INFO_END] = 0;
                $this->parent = $this->parent->parent;
            }
            $node->parent = $this->parent;
        }

        $guard = 0; // prevent infinity loop
        $space = array($this->copy_skip($this->token_blank), \'\', \'\');

        // attributes
        do {
            if ($this->char!==null && $space[0]===\'\') break;
            $name = $this->copy_until($this->token_equal);
            if($guard===$this->pos) {
                $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                continue;
            }
            $guard = $this->pos;

            // handle endless \'<\'
            if($this->pos>=$this->size-1 && $this->char!==\'>\') {
                $node->nodetype = HDOM_TYPE_TEXT;
                $node->_[HDOM_INFO_END] = 0;
                $node->_[HDOM_INFO_TEXT] = \'<\'.$tag . $space[0] . $name;
                $node->tag = \'text\';
                $this->link_nodes($node, false);
                return true;
            }

            // handle mismatch \'<\'
            if($this->doc[$this->pos-1]==\'<\') {
                $node->nodetype = HDOM_TYPE_TEXT;
                $node->tag = \'text\';
                $node->attr = array();
                $node->_[HDOM_INFO_END] = 0;
                $node->_[HDOM_INFO_TEXT] = substr($this->doc, $begin_tag_pos, $this->pos-$begin_tag_pos-1);
                $this->pos -= 2;
                $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                $this->link_nodes($node, false);
                return true;
            }

            if ($name!==\'/\' && $name!==\'\') {
                $space[1] = $this->copy_skip($this->token_blank);
                $name = $this->restore_noise($name);
                if ($this->lowercase) $name = strtolower($name);
                if ($this->char===\'=\') {
                    $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                    $this->parse_attr($node, $name, $space);
                }
                else {
                    //no value attr: nowrap, checked selected...
                    $node->_[HDOM_INFO_QUOTE][] = HDOM_QUOTE_NO;
                    $node->attr[$name] = true;
                    if ($this->char!=\'>\') $this->char = $this->doc[--$this->pos]; // prev
                }
                $node->_[HDOM_INFO_SPACE][] = $space;
                $space = array($this->copy_skip($this->token_blank), \'\', \'\');
            }
            else
                break;
        } while($this->char!==\'>\' && $this->char!==\'/\');

        $this->link_nodes($node, true);
        $node->_[HDOM_INFO_ENDSPACE] = $space[0];

        // check self closing
        if ($this->copy_until_char_escape(\'>\')===\'/\') {
            $node->_[HDOM_INFO_ENDSPACE] .= \'/\';
            $node->_[HDOM_INFO_END] = 0;
        }
        else {
            // reset parent
            if (!isset($this->self_closing_tags[strtolower($node->tag)])) $this->parent = $node;
        }
        $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
        return true;
    }

    // parse attributes
    protected function parse_attr($node, $name, &$space) {
        $space[2] = $this->copy_skip($this->token_blank);
        switch($this->char) {
            case \'\"\':
                $node->_[HDOM_INFO_QUOTE][] = HDOM_QUOTE_DOUBLE;
                $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                $node->attr[$name] = $this->restore_noise($this->copy_until_char_escape(\'\"\'));
                $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                break;
            case \'\\\'\':
                $node->_[HDOM_INFO_QUOTE][] = HDOM_QUOTE_SINGLE;
                $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                $node->attr[$name] = $this->restore_noise($this->copy_until_char_escape(\'\\\'\'));
                $this->char = (++$this->pos<$this->size) ? $this->doc[$this->pos] : null; // next
                break;
            default:
                $node->_[HDOM_INFO_QUOTE][] = HDOM_QUOTE_NO;
                $node->attr[$name] = $this->restore_noise($this->copy_until($this->token_attr));
        }
    }

    // link node\'s parent
    protected function link_nodes(&$node, $is_child) {
        $node->parent = $this->parent;
        $this->parent->nodes[] = $node;
        if ($is_child)
            $this->parent->children[] = $node;
    }

    // as a text node
    protected function as_text_node($tag) {
        $node = new simple_html_dom_node($this);
        ++$thi