DomParser\simple_html_dom_node

Complexity

Total Complexity

244

Size/Duplication

Total Lines	993
Duplicated Lines	0 %

Importance

Changes

0

48 Methods

Rating	Name	Duplication	Size	Complexity
A	next_sibling()	0	16	5
A	getAllAttributes()	0	3	1
A	getElementById()	0	3	1
A	find_ancestor_tag()	0	22	5
A	appendChild()	0	5	1
A	nodeName()	0	3	1
F	parse_selector()	0	75	18
A	__isset()	0	9	5
A	xmltext()	0	7	1
A	childNodes()	0	3	1
A	last_child()	0	4	2
B	dump_node()	0	48	10
A	hasChildNodes()	0	3	1
A	__destruct()	0	3	1
A	children()	0	7	3
C	convert_text()	0	40	12
A	parentNode()	0	3	1
B	makeup()	0	34	8
A	__get()	0	11	6
A	__unset()	0	4	2
C	get_display_size()	0	68	14
B	match()	0	25	8
F	seek()	0	115	44
A	parent()	0	11	2
A	getElementsById()	0	3	1
A	firstChild()	0	3	1
A	getAttribute()	0	3	1
A	has_child()	0	3	1
A	dump()	0	17	6
A	clear()	0	6	1
C	is_utf8()	0	39	13
A	innertext()	0	15	4
A	previousSibling()	0	3	1
C	find()	0	55	14
A	getElementsByTagName()	0	3	1
D	outertext()	0	56	17
A	__toString()	0	3	1
A	__set()	0	16	5
A	removeAttribute()	0	3	1
A	nextSibling()	0	3	1
A	first_child()	0	4	2
B	text()	0	33	10
A	lastChild()	0	3	1
A	__construct()	0	4	1
A	prev_sibling()	0	15	5
A	hasAttribute()	0	3	1
A	setAttribute()	0	3	1
A	getElementByTagName()	0	3	1

<?php

namespace DomParser;

/*
 * Website: http://sourceforge.net/projects/simplehtmldom/
 * Acknowledge: Jose Solorzano (https://sourceforge.net/projects/php-html/)
 * Contributions by:
 *     Yousuke Kumakura (Attribute filters)
 *     Vadim Voituk (Negative indexes supports of "find" method)
 *     Antcs (Constructor with automatically load contents either text or file/url)
 *
 * all affected sections have comments starting with "PaperG"
 *
 * Paperg - Added case insensitive testing of the value of the selector.
 * Paperg - Added tag_start for the starting index of tags - NOTE: This works but not accurately.
 *  This tag_start gets counted AFTER \r\n have been crushed out, and after the remove_noice calls so it will not reflect the REAL position of the tag in the source,
 *  it will almost always be smaller by some amount.
 *  We use this to determine how far into the file the tag in question is.  This "percentage will never be accurate as the $dom->size is the "real" number of bytes the dom was created from.
 *  but for most purposes, it's a really good estimation.
 * Paperg - Added the forceTagsClosed to the dom constructor.  Forcing tags closed is great for malformed html, but it CAN lead to parsing errors.
 * Allow the user to tell us how much they trust the html.
 * Paperg add the text and plaintext to the selectors for the find syntax.  plaintext implies text in the innertext of a node.  text implies that the tag is a text node.
 * This allows for us to find tags based on the text they contain.
 * Create find_ancestor_tag to see if a tag is - at any level - inside of another specific tag.
 * Paperg: added parse_charset so that we know about the character set of the source document.
 *  NOTE:  If the user's system has a routine called get_last_retrieve_url_contents_content_type availalbe, we will assume it's returning the content-type header from the
 *  last transfer or curl_exec, and we will parse that and use it in preference to any other method of charset detection.
 *
 * Found infinite loop in the case of broken html in restore_noise.  Rewrote to protect from that.
 * PaperG (John Schlick) Added get_display_size for "IMG" tags.
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @author S.C. Chen <me578022@gmail.com>
 * @author John Schlick
 * @author Rus Carroll
 * @version 1.5 ($Rev: 196 $)
 * @package PlaceLocalInclude
 * @subpackage simple_html_dom
 */

/*
 * All of the Defines for the classes below.
 * @author S.C. Chen <me578022@gmail.com>
 */
define('HDOM_TYPE_ELEMENT', 1);
define('HDOM_TYPE_COMMENT', 2);
define('HDOM_TYPE_TEXT', 3);
define('HDOM_TYPE_ENDTAG', 4);
define('HDOM_TYPE_ROOT', 5);
define('HDOM_TYPE_UNKNOWN', 6);
define('HDOM_QUOTE_DOUBLE', 0);
define('HDOM_QUOTE_SINGLE', 1);
define('HDOM_QUOTE_NO', 3);
define('HDOM_INFO_BEGIN', 0);
define('HDOM_INFO_END', 1);
define('HDOM_INFO_QUOTE', 2);
define('HDOM_INFO_SPACE', 3);
define('HDOM_INFO_TEXT', 4);
define('HDOM_INFO_INNER', 5);
define('HDOM_INFO_OUTER', 6);
define('HDOM_INFO_ENDSPACE', 7);
define('DEFAULT_TARGET_CHARSET', 'UTF-8');
define('DEFAULT_BR_TEXT', "\r\n");
define('DEFAULT_SPAN_TEXT', ' ');
if (!defined('MAX_FILE_SIZE')) {
    define('MAX_FILE_SIZE', 600000);
}
// helper functions
// -----------------------------------------------------------------------------
// get html dom from file
// $maxlen is defined in the code as PHP_STREAM_COPY_ALL which is defined as -1.
function file_get_html($url, $use_include_path = false, $context = null, $offset = 0, $maxLen = -1, $lowercase = true, $forceTagsClosed = true, $target_charset = DEFAULT_TARGET_CHARSET, $stripRN = true, $defaultBRText = DEFAULT_BR_TEXT, $defaultSpanText = DEFAULT_SPAN_TEXT)

The parameter $maxLen is not used and could be removed.

{
    // We DO force the tags to be terminated.
    $dom = new simple_html_dom(null, $lowercase, $forceTagsClosed, $target_charset, $stripRN, $defaultBRText, $defaultSpanText);
    // For sourceforge users: uncomment the next line and comment the retreive_url_contents line 2 lines down if it is not already done.
    $contents = file_get_contents($url, $use_include_path, $context, $offset);
    // Paperg - use our own mechanism for getting the contents as we want to control the timeout.
    //$contents = retrieve_url_contents($url);
    if (empty($contents) || strlen($contents) > MAX_FILE_SIZE) {
        return false;
    }
    // The second parameter can force the selectors to all be lowercase.
    $dom->load($contents, $lowercase, $stripRN);

    return $dom;
}

// get html dom from string
function str_get_html($str, $lowercase = true, $forceTagsClosed = true, $target_charset = DEFAULT_TARGET_CHARSET, $stripRN = true, $defaultBRText = DEFAULT_BR_TEXT, $defaultSpanText = DEFAULT_SPAN_TEXT)
{
    $dom = new simple_html_dom(null, $lowercase, $forceTagsClosed, $target_charset, $stripRN, $defaultBRText, $defaultSpanText);
    if (empty($str) || strlen($str) > MAX_FILE_SIZE) {
        $dom->clear();

        return false;
    }
    $dom->load($str, $lowercase, $stripRN);

    return $dom;
}

// dump html dom tree
function dump_html_tree($node, $show_attr = true, $deep = 0)

The parameter $show_attr is not used and could be removed.

The parameter $deep is not used and could be removed.

{
    $node->dump($node);
}

/**
 * simple html dom node
 * PaperG - added ability for "find" routine to lowercase the value of the selector.
 * PaperG - added $tag_start to track the start position of the tag in the total byte index.
 */
class simple_html_dom_node
{
    public $nodetype = HDOM_TYPE_TEXT;
    public $tag = 'text';
    public $attr = [];
    /** @var simple_html_dom_node[] $children */
    public $children = [];
    public $nodes = [];
    public $parent = null;
    // The "info" array - see HDOM_INFO_... for what each element contains.
    public $_ = [];
    public $tag_start = 0;
    private $dom = null;

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

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

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

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

    // dump node's tree
    public function dump($show_attr = true, $deep = 0)
    {
        $lead = str_repeat('    ', $deep);

        echo $lead.$this->tag;
        if ($show_attr && count($this->attr) > 0) {
            echo '(';
            foreach ($this->attr as $k=>$v) {
                echo "[$k]=>\"".$this->$k.'", ';
            }
            echo ')';
        }
        echo "\n";

        if ($this->nodes) {

The expression $this->nodes of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

            foreach ($this->nodes as $c) {
                $c->dump($show_attr, $deep + 1);
            }
        }
    }

    // Debugging function to dump a single dom node with a bunch of information about it.
    public function dump_node($echo = true)
    {
        $string = $this->tag;
        if (count($this->attr) > 0) {
            $string .= '(';
            foreach ($this->attr as $k=>$v) {
                $string .= "[$k]=>\"".$this->$k.'", ';
            }
            $string .= ')';
        }
        if (count($this->_) > 0) {
            $string .= ' $_ (';
            foreach ($this->_ as $k=>$v) {
                if (is_array($v)) {
                    $string .= "[$k]=>(";
                    foreach ($v as $k2=>$v2) {
                        $string .= "[$k2]=>\"".$v2.'", ';
                    }
                    $string .= ')';
                } else {
                    $string .= "[$k]=>\"".$v.'", ';
                }
            }
            $string .= ')';
        }

        if (isset($this->text)) {

The property text does not exist on DomParser\simple_html_dom_node. Since you implemented __get, consider adding a @property annotation.

            $string .= ' text: ('.$this->text.')';
        }

        $string .= " HDOM_INNER_INFO: '";
        if (isset($node->_[HDOM_INFO_INNER])) {

The variable $node seems to be never defined.

            $string .= $node->_[HDOM_INFO_INNER]."'";
        } else {
            $string .= ' NULL ';
        }

        $string .= ' children: '.count($this->children);
        $string .= ' nodes: '.count($this->nodes);
        $string .= ' tag_start: '.$this->tag_start;
        $string .= "\n";

        if ($echo) {
            echo $string;

            return;
        } else {
            return $string;
        }
    }

    // returns the parent of node
    // If a node is passed in, it will reset the parent of the current node to that one.
    public function parent($parent = null)
    {
        // I am SURE that this doesn't work properly.
        // It fails to unset the current node from it's current parents nodes or children list first.
        if ($parent !== null) {
            $this->parent = $parent;
            $this->parent->nodes[] = $this;
            $this->parent->children[] = $this;
        }

        return $this->parent;
    }

    // verify that node has children
    public function has_child()
    {
        return !empty($this->children);
    }

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

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

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

    // returns the next sibling of node
    public function next_sibling()
    {
        if ($this->parent === null) {
            return;
        }

        $idx = 0;
        $count = count($this->parent->children);
        while ($idx < $count && $this !== $this->parent->children[$idx]) {
            $idx++;
        }
        if (++$idx >= $count) {
            return;
        }

        return $this->parent->children[$idx];
    }

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

        return $this->parent->children[$idx];
    }

    // function to locate a specific ancestor tag in the path to the root.
    public function find_ancestor_tag($tag)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        // Start by including ourselves in the comparison.
        $returnDom = $this;

        while (!is_null($returnDom)) {
            if (is_object($debugObject)) {
                $debugObject->debugLog(2, 'Current tag is: '.$returnDom->tag);
            }

            if ($returnDom->tag == $tag) {
                break;
            }
            $returnDom = $returnDom->parent;
        }

        return $returnDom;
    }

    // get dom node's inner html
    public 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)
    public function outertext()
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $text = '';
            if ($this->tag == 'text') {
                if (!empty($this->text)) {

The property text does not exist on DomParser\simple_html_dom_node. Since you implemented __get, consider adding a @property annotation.

                    $text = ' with text: '.$this->text;
                }
            }
            $debugObject->debugLog(1, 'Innertext of tag: '.$this->tag.$text);
        }

        if ($this->tag === 'root') {
            return $this->innertext();
        }

        // trigger callback
        if ($this->dom && $this->dom->callback !== null) {
            call_user_func_array($this->dom->callback, [$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
        if ($this->dom && $this->dom->nodes[$this->_[HDOM_INFO_BEGIN]]) {
            $ret = $this->dom->nodes[$this->_[HDOM_INFO_BEGIN]]->makeup();
        } else {
            $ret = '';
        }

        // render inner text
        if (isset($this->_[HDOM_INFO_INNER])) {
            // If it's a br tag...  don't return the HDOM_INNER_INFO that we may or may not have added.
            if ($this->tag != 'br') {
                $ret .= $this->_[HDOM_INFO_INNER];
            }
        } else {
            if ($this->nodes) {

The expression $this->nodes of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

                foreach ($this->nodes as $n) {
                    $ret .= $this->convert_text($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
    public 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 = '';
        // In rare cases, (always node type 1 or HDOM_TYPE_ELEMENT - observed for some span tags, and some p tags) $this->nodes is set to NULL.
        // NOTE: This indicates that there is a problem where it's set to NULL without a clear happening.
        // WHY is this happening?
        if (!is_null($this->nodes)) {

The condition is_null($this->nodes) is always false.

            foreach ($this->nodes as $n) {
                $ret .= $this->convert_text($n->text());
            }

            // If this node is a span... add a space at the end of it so multiple spans don't run into each other.  This is plaintext after all.
            if ($this->tag == 'span') {
                $ret .= $this->dom->default_span_text;
            }
        }

        return $ret;
    }

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

        return $ret;
    }

    // build node's text with tag
    public 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
     * PaperG - added ability for find to lowercase the value of the selector.
     *
     * @param string   $selector
     * @param int|null $idx
     * @param bool     $lowercase
     *
     * @return simple_html_dom_node[]|simple_html_dom_node|null
     */
    public function find($selector, $idx = null, $lowercase = false)
    {
        $selectors = $this->parse_selector($selector);
        if (($count = count($selectors)) === 0) {
            return [];
        }
        $found_keys = [];

        // find each selector
        for ($c = 0; $c < $count; $c++) {
            // The change on the below line was documented on the sourceforge code tracker id 2788009
            // used to be: if (($levle=count($selectors[0]))===0) return array();
            if (($levle = count($selectors[$c])) === 0) {
                return [];
            }
            if (!isset($this->_[HDOM_INFO_BEGIN])) {
                return [];
            }

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

            // handle descendant selectors, no recursive!
            for ($l = 0; $l < $levle; $l++) {
                $ret = [];
                foreach ($head as $k=>$v) {
                    $n = ($k === -1) ? $this->dom->root : $this->dom->nodes[$k];
                    //PaperG - Pass this optional parameter on to the seek function.
                    $n->seek($selectors[$c][$l], $ret, $lowercase);
                }
                $head = $ret;
            }

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

        // sort keys
        ksort($found_keys);

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

        // return nth-element or array
        if (is_null($idx)) {
            return $found;
        } elseif ($idx < 0) {
            $idx = count($found) + $idx;
        }

        return (isset($found[$idx])) ? $found[$idx] : null;
    }

    // seek for given conditions
    // PaperG - added parameter to allow for case insensitive testing of the value of a selector.
    protected function seek($selector, &$ret, $lowercase = false)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        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])) {
                        $pass = false;
                    }
                } else {
                    if (($key != 'plaintext') && !isset($node->attr[$key])) {
                        $pass = false;
                    }
                }
            }
            // compare value
            if ($pass && $key && $val && $val !== '*') {
                // If they have told us that this is a "plaintext" search then we want the plaintext of the node - right?
                if ($key == 'plaintext') {
                    // $node->plaintext actually returns $node->text();
                    $nodeKeyValue = $node->text();
                } else {
                    // this is a normal search, we want the value of that attribute of the tag.
                    $nodeKeyValue = $node->attr[$key];
                }
                if (is_object($debugObject)) {
                    $debugObject->debugLog(2, 'testing node: '.$node->tag.' for attribute: '.$key.$exp.$val.' where nodes value is: '.$nodeKeyValue);
                }

                //PaperG - If lowercase is set, do a case insensitive test of the value of the selector.
                if ($lowercase) {
                    $check = $this->match($exp, strtolower($val), strtolower($nodeKeyValue));
                } else {
                    $check = $this->match($exp, $val, $nodeKeyValue);
                }
                if (is_object($debugObject)) {
                    $debugObject->debugLog(2, 'after match: '.($check ? 'true' : 'false'));
                }

                // handle multiple class
                if (!$check && strcasecmp($key, 'class') === 0) {
                    foreach (explode(' ', $node->attr[$key]) as $k) {
                        // Without this, there were cases where leading, trailing, or double spaces lead to our comparing blanks - bad form.
                        if (!empty($k)) {
                            if ($lowercase) {
                                $check = $this->match($exp, strtolower($val), strtolower($k));
                            } else {
                                $check = $this->match($exp, $val, $k);
                            }
                            if ($check) {
                                break;
                            }
                        }
                    }
                }
                if (!$check) {
                    $pass = false;
                }
            }
            if ($pass) {
                $ret[$i] = 1;
            }
            unset($node);
        }
        // It's passed by reference so this is actually what this function returns.
        if (is_object($debugObject)) {
            $debugObject->debugLog(1, 'EXIT - ret: ', $ret);
        }
    }

    protected function match($exp, $pattern, $value)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        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)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        // pattern of CSS selectors, modified from mootools
        // Paperg: Add the colon to the attrbute, so that it properly finds <tag attr:ibute="something" > like google does.
        // Note: if you try to look at this attribute, yo MUST use getAttribute since $dom->x:y will fail the php syntax check.
        // Notice the \[ starting the attbute?  and the @? following?  This implies that an attribute can begin with an @ sign that is not captured.
        // This implies that an html attribute specifier may start with an @ sign that is NOT captured by the expression.
        // farther study is required to determine of this should be documented or removed.
//        $pattern = "/([\w-:\*]*)(?:\#([\w-]+)|\.([\w-]+))?(?:\[@?(!?[\w-]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";
        $pattern = "/([\w-:\*]*)(?:\#([\w-]+)|\.([\w-]+))?(?:\[@?(!?[\w-:]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";
        preg_match_all($pattern, trim($selector_string).' ', $matches, PREG_SET_ORDER);
        if (is_object($debugObject)) {
            $debugObject->debugLog(2, 'Matches Array: ', $matches);
        }

        $selectors = [];
        $result = [];
        //print_r($matches);

        foreach ($matches as $m) {
            $m[0] = trim($m[0]);
            if ($m[0] === '' || $m[0] === '/' || $m[0] === '//') {
                continue;
            }
            // for browser generated xpath
            if ($m[1] === 'tbody') {
                continue;
            }

            list($tag, $key, $val, $exp, $no_key) = [$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;
            }

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

        return $selectors;
    }

    public function __get($name)
    {
        if (isset($this->attr[$name])) {
            return $this->convert_text($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);
        }
    }

    public 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][] = [' ', '', ''];
            $this->_[HDOM_INFO_QUOTE][] = HDOM_QUOTE_DOUBLE;
        }
        $this->attr[$name] = $value;
    }

    public 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]);
    }

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

    // PaperG - Function to convert the text from one character set to another if the two sets are not the same.
    public function convert_text($text)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        $converted_text = $text;

        $sourceCharset = '';
        $targetCharset = '';

        if ($this->dom) {
            $sourceCharset = strtoupper($this->dom->_charset);
            $targetCharset = strtoupper($this->dom->_target_charset);
        }
        if (is_object($debugObject)) {
            $debugObject->debugLog(3, 'source charset: '.$sourceCharset.' target charaset: '.$targetCharset);
        }

        if (!empty($sourceCharset) && !empty($targetCharset) && (strcasecmp($sourceCharset, $targetCharset) != 0)) {
            // Check if the reported encoding could have been incorrect and the text is actually already UTF-8
            if ((strcasecmp($targetCharset, 'UTF-8') == 0) && ($this->is_utf8($text))) {
                $converted_text = $text;
            } else {
                $converted_text = iconv($sourceCharset, $targetCharset, $text);
            }
        }

        // Lets make sure that we don't have that silly BOM issue with any of the utf-8 text we output.
        if ($targetCharset == 'UTF-8') {
            if (substr($converted_text, 0, 3) == "\xef\xbb\xbf") {
                $converted_text = substr($converted_text, 3);
            }
            if (substr($converted_text, -3) == "\xef\xbb\xbf") {
                $converted_text = substr($converted_text, 0, -3);
            }
        }

        return $converted_text;
    }

    /**
     * Returns true if $string is valid UTF-8 and false otherwise.
     *
     * @param mixed $str String to be tested
     *
     * @return bool
     */
    public static function is_utf8($str)
    {
        $c = 0;

The assignment to $c is dead and can be removed.

        $b = 0;

The assignment to $b is dead and can be removed.

        $bits = 0;
        $len = strlen($str);
        for ($i = 0; $i < $len; $i++) {
            $c = ord($str[$i]);
            if ($c > 128) {
                if (($c >= 254)) {
                    return false;
                } elseif ($c >= 252) {
                    $bits = 6;
                } elseif ($c >= 248) {
                    $bits = 5;
                } elseif ($c >= 240) {
                    $bits = 4;
                } elseif ($c >= 224) {
                    $bits = 3;
                } elseif ($c >= 192) {
                    $bits = 2;
                } else {
                    return false;
                }
                if (($i + $bits) > $len) {
                    return false;
                }
                while ($bits > 1) {
                    $i++;
                    $b = ord($str[$i]);
                    if ($b < 128 || $b > 191) {
                        return false;
                    }
                    $bits--;
                }
            }
        }

        return true;
    }

    /*
    function is_utf8($string)
    {
        //this is buggy
        return (utf8_encode(utf8_decode($string)) == $string);
    }
    */

    /**
     * Function to try a few tricks to determine the displayed size of an img on the page.
     * NOTE: This will ONLY work on an IMG tag. Returns FALSE on all other tag types.
     *
     * @author John Schlick
     *
     * @version April 19 2012
     *
     * @return array an array containing the 'height' and 'width' of the image on the page or -1 if we can't figure it out.
     */
    public function get_display_size()
    {
        global $debugObject;

        $width = -1;
        $height = -1;

        if ($this->tag !== 'img') {
            return false;

The expression return false returns the type false which is incompatible with the documented return type array.

        }

        // See if there is aheight or width attribute in the tag itself.
        if (isset($this->attr['width'])) {
            $width = $this->attr['width'];
        }

        if (isset($this->attr['height'])) {
            $height = $this->attr['height'];
        }

        // Now look for an inline style.
        if (isset($this->attr['style'])) {
            // Thanks to user gnarf from stackoverflow for this regular expression.
            $attributes = [];
            preg_match_all("/([\w-]+)\s*:\s*([^;]+)\s*;?/", $this->attr['style'], $matches, PREG_SET_ORDER);
            foreach ($matches as $match) {
                $attributes[$match[1]] = $match[2];
            }

            // If there is a width in the style attributes:
            if (isset($attributes['width']) && $width == -1) {
                // check that the last two characters are px (pixels)
                if (strtolower(substr($attributes['width'], -2)) == 'px') {
                    $proposed_width = substr($attributes['width'], 0, -2);
                    // Now make sure that it's an integer and not something stupid.
                    if (filter_var($proposed_width, FILTER_VALIDATE_INT)) {
                        $width = $proposed_width;
                    }
                }
            }

            // If there is a width in the style attributes:
            if (isset($attributes['height']) && $height == -1) {
                // check that the last two characters are px (pixels)
                if (strtolower(substr($attributes['height'], -2)) == 'px') {
                    $proposed_height = substr($attributes['height'], 0, -2);
                    // Now make sure that it's an integer and not something stupid.
                    if (filter_var($proposed_height, FILTER_VALIDATE_INT)) {
                        $height = $proposed_height;
                    }
                }
            }
        }

        // Future enhancement:
        // Look in the tag to see if there is a class or id specified that has a height or width attribute to it.

        // Far future enhancement
        // Look at all the parent tags of this image to see if they specify a class or id that has an img selector that specifies a height or width
        // Note that in this case, the class or id will have the img subselector for it to apply to the image.

        // ridiculously far future development
        // If the class or id is specified in a SEPARATE css file thats not on the page, go get it and do what we were just doing for the ones on the page.

        $result = ['height'     => $height,
                        'width' => $width, ];

        return $result;
    }

    // camel naming conventions
    public function getAllAttributes()
    {
        return array_map('html_entity_decode', $this->attr);
    }

    public function getAttribute($name)
    {
        return html_entity_decode($this->__get($name));
    }

    public function setAttribute($name, $value)
    {
        $this->__set($name, $value);
    }

    public function hasAttribute($name)
    {
        return $this->__isset($name);
    }

    public function removeAttribute($name)
    {
        $this->__set($name, null);
    }

    public function getElementById($id)
    {
        return $this->find("#$id", 0);
    }

    public function getElementsById($id, $idx = null)
    {
        return $this->find("#$id", $idx);
    }

    public function getElementByTagName($name)
    {
        return $this->find($name, 0);
    }

    public function getElementsByTagName($name, $idx = null)
    {
        return $this->find($name, $idx);
    }

    public function parentNode()
    {
        return $this->parent();
    }

    public function childNodes($idx = -1)
    {
        return $this->children($idx);
    }

    public function firstChild()
    {
        return $this->first_child();
    }

    public function lastChild()
    {
        return $this->last_child();
    }

    public function nextSibling()
    {
        return $this->next_sibling();
    }

    public function previousSibling()
    {
        return $this->prev_sibling();
    }

    public function hasChildNodes()
    {
        return $this->has_child();
    }

    public function nodeName()
    {
        return $this->tag;
    }

    public function appendChild($node)
    {
        $node->parent($this);

        return $node;
    }
}

/**
 * simple html dom parser
 * Paperg - in the find routine: allow us to specify that we want case insensitive testing of the value of the selector.
 * Paperg - change $size from protected to public so we can easily access it
 * Paperg - added ForceTagsClosed in the constructor which tells us whether we trust the html or not.  Default is to NOT trust it.
 */
class simple_html_dom
{
    /** @var simple_html_dom_node $root */
    public $root = null;
    public $nodes = [];
    public $callback = null;
    public $lowercase = false;
    // Used to keep track of how large the text was when we started.
    public $original_size;
    public $size;
    protected $pos;
    protected $doc;
    protected $char;
    protected $cursor;
    protected $parent;
    protected $noise = [];
    protected $token_blank = " \t\r\n";
    protected $token_equal = ' =/>';
    protected $token_slash = " />\r\n\t";
    protected $token_attr = ' >';
    // Note that this is referenced by a child node, and so it needs to be public for that node to see this information.
    public $_charset = '';
    public $_target_charset = '';
    protected $default_br_text = '';
    public $default_span_text = '';

    // use isset instead of in_array, performance boost about 30%...
    protected $self_closing_tags = ['img'=>1, 'br'=>1, 'input'=>1, 'meta'=>1, 'link'=>1, 'hr'=>1, 'base'=>1, 'embed'=>1, 'spacer'=>1];
    protected $block_tags = ['root'=>1, 'body'=>1, 'form'=>1, 'div'=>1, 'span'=>1, 'table'=>1];
    // Known sourceforge issue #2977341
    // B tags that are not closed cause us to return everything to the end of the document.
    protected $optional_closing_tags = [
        'tr'    => ['tr'=>1, 'td'=>1, 'th'=>1],
        'th'    => ['th'=>1],
        'td'    => ['td'=>1],
        'li'    => ['li'=>1],
        'dt'    => ['dt'=>1, 'dd'=>1],
        'dd'    => ['dd'=>1, 'dt'=>1],
        'dl'    => ['dd'=>1, 'dt'=>1],
        'p'     => ['p'=>1],
        'nobr'  => ['nobr'=>1],
        'b'     => ['b'=>1],
        'option'=> ['option'=>1],
    ];

    public function __construct($str = null, $lowercase = true, $forceTagsClosed = true, $target_charset = DEFAULT_TARGET_CHARSET, $stripRN = true, $defaultBRText = DEFAULT_BR_TEXT, $defaultSpanText = DEFAULT_SPAN_TEXT)
    {
        if ($str) {
            if (preg_match("/^http:\/\//i", $str) || is_file($str)) {
                $this->load_file($str);
            } else {
                $this->load($str, $lowercase, $stripRN, $defaultBRText, $defaultSpanText);
            }
        }
        // Forcing tags to be closed implies that we don't trust the html, but it can lead to parsing errors if we SHOULD trust the html.
        if (!$forceTagsClosed) {
            $this->optional_closing_array = [];

The property optional_closing_array does not exist. Although not strictly required by PHP, it is generally a best practice to declare properties explicitly.

        }
        $this->_target_charset = $target_charset;
    }

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

    // load html from string
    public function load($str, $lowercase = true, $stripRN = true, $defaultBRText = DEFAULT_BR_TEXT, $defaultSpanText = DEFAULT_SPAN_TEXT)
    {
        global $debugObject;

        // prepare
        $this->prepare($str, $lowercase, $stripRN, $defaultBRText, $defaultSpanText);
        // strip out comments
        $this->remove_noise("'<!--(.*?)-->'is");
        // strip out cdata
        $this->remove_noise("'<!\[CDATA\[(.*?)\]\]>'is", true);
        // Per sourceforge http://sourceforge.net/tracker/?func=detail&aid=2949097&group_id=218559&atid=1044037
        // Script tags removal now preceeds style tag removal.
        // 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 <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 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;
        $this->parse_charset();

        // make load function chainable
        return $this;
    }

    // load html from file
    public function load_file()
    {
        $args = func_get_args();
        $this->load(call_user_func_array('file_get_contents', $args), true);
        // Throw an error if we can't properly load the dom.
        if (($error = error_get_last()) !== null) {

The assignment to $error is dead and can be removed.

            $this->clear();

            return false;
        }
    }

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

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

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

        return $ret;
    }

    // find dom node by css selector
    // Paperg - allow us to specify that we want case insensitive testing of the value of the selector.
    public function find($selector, $idx = null, $lowercase = false)
    {
        return $this->root->find($selector, $idx, $lowercase);
    }

    // clean up memory due to php5 circular references memory leak...
    public function clear()
    {
        foreach ($this->nodes as $n) {
            $n->clear();
            $n = null;

The assignment to $n is dead and can be removed.

        }
        // This add next line is documented in the sourceforge repository. 2977248 as a fix for ongoing memory leaks that occur even with the use of clear.
        if (isset($this->children)) {
            foreach ($this->children 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);
    }

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

    // prepare HTML data and init everything
    protected function prepare($str, $lowercase = true, $stripRN = true, $defaultBRText = DEFAULT_BR_TEXT, $defaultSpanText = DEFAULT_SPAN_TEXT)
    {
        $this->clear();

        // set the length of content before we do anything to it.
        $this->size = strlen($str);
        // Save the original size of the html that we got in.  It might be useful to someone.
        $this->original_size = $this->size;

        //before we save the string as the doc...  strip out the \r \n's if we are told to.
        if ($stripRN) {
            $str = str_replace("\r", ' ', $str);
            $str = str_replace("\n", ' ', $str);

            // set the length of content since we have changed it.
            $this->size = strlen($str);
        }

        $this->doc = $str;
        $this->pos = 0;
        $this->cursor = 1;
        $this->noise = [];
        $this->nodes = [];
        $this->lowercase = $lowercase;
        $this->default_br_text = $defaultBRText;
        $this->default_span_text = $defaultSpanText;
        $this->root = new simple_html_dom_node($this);
        $this->root->tag = 'root';
        $this->root->_[HDOM_INFO_BEGIN] = -1;
        $this->root->nodetype = HDOM_TYPE_ROOT;
        $this->parent = $this->root;
        if ($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;
    }

    // PAPERG - dkchou - added this to try to identify the character set of the page we have just parsed so we know better how to spit it out later.
    // NOTE:  IF you provide a routine called get_last_retrieve_url_contents_content_type which returns the CURLINFO_CONTENT_TYPE from the last curl_exec
    // (or the content_type header from the last transfer), we will parse THAT, and if a charset is specified, we will use it over any other mechanism.
    protected function parse_charset()
    {
        global $debugObject;

        $charset = null;

        if (function_exists('get_last_retrieve_url_contents_content_type')) {
            $contentTypeHeader = get_last_retrieve_url_contents_content_type();
            $success = preg_match('/charset=(.+)/', $contentTypeHeader, $matches);
            if ($success) {
                $charset = $matches[1];
                if (is_object($debugObject)) {
                    $debugObject->debugLog(2, 'header content-type found charset of: '.$charset);
                }
            }
        }

        if (empty($charset)) {
            $el = $this->root->find('meta[http-equiv=Content-Type]', 0);
            if (!empty($el)) {
                $fullvalue = $el->content;

The property content does not exist on DomParser\simple_html_dom_node. Since you implemented __get, consider adding a @property annotation.

                if (is_object($debugObject)) {
                    $debugObject->debugLog(2, 'meta content-type tag found'.$fullvalue);
                }

                if (!empty($fullvalue)) {
                    $success = preg_match('/charset=(.+)/', $fullvalue, $matches);
                    if ($success) {
                        $charset = $matches[1];
                    } else {
                        // If there is a meta tag, and they don't specify the character set, research says that it's typically ISO-8859-1
                        if (is_object($debugObject)) {
                            $debugObject->debugLog(2, 'meta content-type tag couldn\'t be parsed. using iso-8859 default.');
                        }
                        $charset = 'ISO-8859-1';
                    }
                }
            }
        }

        // If we couldn't find a charset above, then lets try to detect one based on the text we got...
        if (empty($charset)) {
            // Have php try to detect the encoding from the text given to us.
            $charset = (function_exists('mb_detect_encoding')) ? mb_detect_encoding($this->root->plaintext.'ascii', $encoding_list = ['UTF-8', 'CP1252']) : false;

The property plaintext does not exist on DomParser\simple_html_dom_node. Since you implemented __get, consider adding a @property annotation.

            if (is_object($debugObject)) {
                $debugObject->debugLog(2, 'mb_detect found: '.$charset);

Are you sure $charset of type false|string can be used in concatenation?

            }

            // and if this doesn't work...  then we need to just wrongheadedly assume it's UTF-8 so that we can move on - cause this will usually give us most of what we need...
            if ($charset === false) {
                if (is_object($debugObject)) {
                    $debugObject->debugLog(2, 'since mb_detect failed - using default of utf-8');
                }
                $charset = 'UTF-8';
            }
        }

        // Since CP1252 is a superset, if we get one of it's subsets, we want it instead.
        if ((strtolower($charset) == strtolower('ISO-8859-1')) || (strtolower($charset) == strtolower('Latin1')) || (strtolower($charset) == strtolower('Latin-1'))) {
            if (is_object($debugObject)) {
                $debugObject->debugLog(2, 'replacing '.$charset.' with CP1252 as its a superset');
            }
            $charset = 'CP1252';
        }

        if (is_object($debugObject)) {
            $debugObject->debugLog(1, 'EXIT - '.$charset);
        }

        return $this->_charset = $charset;
    }

    // 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 represents the change in the simple_html_dom trunk from revision 180 to 181.
            // $this->skip($this->token_blank_t);
            $this->skip($this->token_blank);
            $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);
                    }
                } elseif (($this->parent->parent) && isset($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);
                    }
                } elseif (($this->parent->parent) && strtolower($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);
        $node->tag_start = $begin_tag_pos;

        // 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) {

The assignment to $pos is dead and can be removed.

            $tag = '<'.substr($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
        $space = [$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 = [];
                $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;
                $space = [$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

        // If it's a BR tag, we need to set it's text to the default text.
        // This way when we see it in plaintext, we can generate formatting that the user wants.
        // since a br tag never has sub nodes, this works well.
        if ($node->tag == 'br') {
            $node->_[HDOM_INFO_INNER] = $this->default_br_text;
        }

        return true;
    }

    // parse attributes
    protected function parse_attr($node, $name, &$space)
    {
        // Per sourceforge: http://sourceforge.net/tracker/?func=detail&aid=3061408&group_id=218559&atid=1044037
        // If the attribute is already defined inside a tag, only pay atetntion to the first one as opposed to the last one.
        if (isset($node->attr[$name])) {
            return;
        }

        $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));
        }
        // PaperG: Attributes should not have \r or \n in them, that counts as html whitespace.
        $node->attr[$name] = str_replace("\r", '', $node->attr[$name]);
        $node->attr[$name] = str_replace("\n", '', $node->attr[$name]);
        // PaperG: If this is a "class" selector, lets get rid of the preceeding and trailing space since some people leave it in the multi class case.
        if ($name == 'class') {
            $node->attr[$name] = trim($node->attr[$name]);
        }
    }

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

    protected function skip($chars)
    {
        $this->pos += strspn($this->doc, $chars, $this->pos);
        $this->char = ($this->pos < $this->size) ? $this->doc[$this->pos] : null; // next
    }

    protected function copy_skip($chars)
    {
        $pos = $this->pos;
        $len = strspn($this->doc, $chars, $pos);
        $this->pos += $len;
        $this->char = ($this->pos < $this->size) ? $this->doc[$this->pos] : null; // next
        if ($len === 0) {
            return '';
        }

        return substr($this->doc, $pos, $len);
    }

    protected function copy_until($chars)
    {
        $pos = $this->pos;
        $len = strcspn($this->doc, $chars, $pos);
        $this->pos += $len;
        $this->char = ($this->pos < $this->size) ? $this->doc[$this->pos] : null; // next
        return substr($this->doc, $pos, $len);
    }

    protected function copy_until_char($char)
    {
        if ($this->char === null) {
            return '';
        }

        if (($pos = strpos($this->doc, $char, $this->pos)) === false) {
            $ret = substr($this->doc, $this->pos, $this->size - $this->pos);
            $this->char = null;
            $this->pos = $this->size;

            return $ret;
        }

        if ($pos === $this->pos) {
            return '';
        }
        $pos_old = $this->pos;
        $this->char = $this->doc[$pos];
        $this->pos = $pos;

        return substr($this->doc, $pos_old, $pos - $pos_old);
    }

    protected function copy_until_char_escape($char)
    {
        if ($this->char === null) {
            return '';
        }

        $start = $this->pos;
        while (1) {
            if (($pos = strpos($this->doc, $char, $start)) === false) {
                $ret = substr($this->doc, $this->pos, $this->size - $this->pos);
                $this->char = null;
                $this->pos = $this->size;

                return $ret;
            }

            if ($pos === $this->pos) {
                return '';
            }

            if ($this->doc[$pos - 1] === '\\') {
                $start = $pos + 1;
                continue;
            }

            $pos_old = $this->pos;
            $this->char = $this->doc[$pos];
            $this->pos = $pos;

            return substr($this->doc, $pos_old, $pos - $pos_old);
        }
    }

    // remove noise from html content
    // save the noise in the $this->noise array.
    protected function remove_noise($pattern, $remove_tag = false)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        $count = preg_match_all($pattern, $this->doc, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);

        for ($i = $count - 1; $i > -1; $i--) {
            $key = '___noise___'.sprintf('% 5d', count($this->noise) + 1000);
            if (is_object($debugObject)) {
                $debugObject->debugLog(2, 'key is: '.$key);
            }
            $idx = ($remove_tag) ? 0 : 1;
            $this->noise[$key] = $matches[$i][$idx][0];
            $this->doc = substr_replace($this->doc, $key, $matches[$i][$idx][1], strlen($matches[$i][$idx][0]));
        }

        // reset the length of content
        $this->size = strlen($this->doc);
        if ($this->size > 0) {
            $this->char = $this->doc[0];
        }
    }

    // restore noise to html content
    public function restore_noise($text)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        while (($pos = strpos($text, '___noise___')) !== false) {
            // Sometimes there is a broken piece of markup, and we don't GET the pos+11 etc... token which indicates a problem outside of us...
            if (strlen($text) > $pos + 15) {
                $key = '___noise___'.$text[$pos + 11].$text[$pos + 12].$text[$pos + 13].$text[$pos + 14].$text[$pos + 15];
                if (is_object($debugObject)) {
                    $debugObject->debugLog(2, 'located key of: '.$key);
                }

                if (isset($this->noise[$key])) {
                    $text = substr($text, 0, $pos).$this->noise[$key].substr($text, $pos + 16);
                } else {
                    // do this to prevent an infinite loop.
                    $text = substr($text, 0, $pos).'UNDEFINED NOISE FOR KEY: '.$key.substr($text, $pos + 16);
                }
            } else {
                // There is no valid key being given back to us... We must get rid of the ___noise___ or we will have a problem.
                $text = substr($text, 0, $pos).'NO NUMERIC NOISE KEY'.substr($text, $pos + 11);
            }
        }

        return $text;
    }

    // Sometimes we NEED one of the noise elements.
    public function search_noise($text)
    {
        global $debugObject;
        if (is_object($debugObject)) {
            $debugObject->debugLogEntry(1);
        }

        foreach ($this->noise as $noiseElement) {
            if (strpos($noiseElement, $text) !== false) {
                return $noiseElement;
            }
        }
    }

    public function __toString()
    {
        return $this->root->innertext();
    }

    public function __get($name)
    {
        switch ($name) {
            case 'outertext':
                return $this->root->innertext();
            case 'innertext':
                return $this->root->innertext();
            case 'plaintext':
                return $this->root->text();
            case 'charset':
                return $this->_charset;
            case 'target_charset':
                return $this->_target_charset;
        }
    }

    // camel naming conventions
    public function childNodes($idx = -1)
    {
        return $this->root->childNodes($idx);
    }

    public function firstChild()
    {
        return $this->root->first_child();
    }

    public function lastChild()
    {
        return $this->root->last_child();
    }

    public function createElement($name, $value = null)
    {
        return @str_get_html("<$name>$value</$name>")->first_child();

The method first_child() does not exist on DomParser\simple_html_dom. Did you maybe mean firstChild()?

    }

    public function createTextNode($value)
    {
        return @end(str_get_html($value)->nodes);
    }

    public function getElementById($id)
    {
        return $this->find("#$id", 0);
    }

    public function getElementsById($id, $idx = null)
    {
        return $this->find("#$id", $idx);
    }

    public function getElementByTagName($name)
    {
        return $this->find($name, 0);
    }

    public function getElementsByTagName($name, $idx = -1)
    {
        return $this->find($name, $idx);
    }

    public function loadFile()
    {
        $args = func_get_args();
        $this->load_file($args);
    }
}