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<?phpclass node{	protected $name;	protected $attr;	protected $data;	protected $child;		public function __construct($name, $attr = array(), $data = '')	{		$this->name = $name;		$this->attr = $attr;		$this->data = $data;		$this->child = array();	}		public function add($node) { $this->child[] = $node; }	public function attr($k) { return $this->attr[$k]; }		public function __get($k)	{		foreach($this->child as $v) if($v->name == $k) return $v;		return null;	}		public function asXML()	{		$xml = '';		$xml .= '<' . $this->name;		foreach($this->attr as $k => $v) $xml .= ' ' . $k . '="' . htmlentities($v) . '"';		$xml .= '>';		$xml .= htmlentities($this->data);		foreach($this->child as $n) $xml .= $n->asXML();		$xml .= '</' . $this->name . '>';		return $xml;	}}class parser{	protected $token;		public function v()	{		array_shift($this->token);	}		public function	parse($data)	{		preg_match_all('/<([^>]*)>([^<]*)/si', $data, $this->token, PREG_SET_ORDER);		$this->root = null;		$this->parse_helper(null);		return $this->root;	}		function parse_helper($parent)	{		while(1)		{			if(!count($this->token)) break;			elseif($this->token[0][1]{0} === '?') { $this->v(); }			elseif($this->token[0][1]{0} === '/') { return; }			elseif(preg_match('/^([a-z_]+)(.*)/si', $this->token[0][1], $match))			{				$name = $match[1];				$attr = array();				if(preg_match_all('/([a-z_]+)="(.*?)"/', $match[2], $amatch, PREG_SET_ORDER)) foreach($amatch as $v) $attr[$v[1]] = html_entity_decode($v[2]);				$data = html_entity_decode($this->token[0][2]);				$node = new node($name, $attr, $data);				$parent ? $parent->add($node) : $this->root = $node;				$this->v();				$this->parse_helper($node);				$this->v();			}			else throw new Exception('unrecognized token');		}	}}?>