ใครมี script เปลี่ยน bbcode เป็น html บ้างครับ ขอซื้อต่อหน่อย

<?php
	class BbCode //by num
	{

		var $bb = array(
		  'b'=>array('/\[b\](.+?)\[\/b\]/is','<span class="bold">$1</span>'),
		  'i'=>array('/\[i\](.+?)\[\/i\]/is','<span class="italic">$1</span>'),
		  'u'=>array('/\[u\](.+?)\[\/u\]/is','<span class="underline">$1</span>'),
		  'img'=>array('/\[img\]\s*(http:.+?)\[\/img\]/i','<img src="$1" />'),
		  'url'=>array('/\[url\]\s*(http:.+?)\[\/url\]/i','<a href="$1">$1</a>'),
	    'url2'=>array('/\[url=\s*(http:.+?)\](.+?)\[\/url\]/is','<a href="$1">$2</a>'),
		);
		var $_CSRF = array('img');
		var $_key;

		function h($s){
			return htmlspecialchars($s);
		}

		function style(){
			$s = '<style type="text/css">'.
			'.bold {font-weight:bold;}'.
			'.italic {font-style:italic;}'.
			'.underline {text-decoration:underline;}'.
			'</style>';
			return $s;
		}

		function _bb($backref){
		  unset($backref[0]);
			$a = array();
			$n = 0;
			while(isset($backref[++$n])) {
				if (in_array($this->_key,$this->_CSRF)) {
				  $backref[$n] = preg_replace('/\?/is','#illegal#', $backref[$n]);
				}
				$a[] = '$'.$n;
			}
		  $s = str_replace($a,$backref,$this->bb[$this->_key][1]);
		  return $s;
		}

		function html($s,$escape=true,$csrf=true,$bb=array())
		{
		  $temp = $this->_CSRF;
		  if (!$csrf)
		    $this->_CSRF = array();
			if ($escape)
			  $s = $this->h($s);
			if ($bb===array())
			  $bb = array_keys($this->bb);
			foreach($bb as $key){
			  $this->_key = $key;
				$s = preg_replace_callback($this->bb[$key][0],
					array($this,'_bb'),$s);
			}
			$this->_CSRF = $temp;
		  return $s;
		}

	}

$s1 = 'bb code string';
$s2 = 'bb code string';

$b = new BbCode();
echo $b->style();
echo $b->html($s1);
echo '<hr/>';
echo $b->html($s2);

?>