TofuWarrior

 function RemoveXSS($val) {   // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed   // this prevents some character re-spacing such as <java\0script>   // note that you have to handle splits with \n, \r, and \t later since they *are* allowed in some inputs   $val = preg_replace('/([\x00-\x08][\x0b-\x0c][\x0e-\x20])/', '', $val);      // straight replacements, the user should never need these since they're normal characters   // this prevents like <IMG SRC=&#X40&#X61&#X76&#X61&#X73&#X63&#X72&#X69&#X70&#X74&#X3A&#X61&#X6C&#X65&#X72&#X74&#X28&#X27&#X58&#X53&#X53&#X27&#X29>   $search = 'abcdefghijklmnopqrstuvwxyz';   $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';   $search .= '1234567890!@#$%^&*()';   $search .= '~`";:?+/={}[]-_|\'\\';   for ($i = 0; $i < strlen($search); $i++) {      // ;? matches the ;, which is optional      // 0{0,7} matches any padded zeros, which are optional and go up to 8 chars         // &#x0040 @ search for the hex values      $val = preg_replace('/(&#[x|X]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ;      // &#00064 @ 0{0,7} matches '0' zero to seven times      $val = preg_replace('/(&#0{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ;   }      // now the only remaining whitespace attacks are \t, \n, and \r   $ra['tags'] = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');   $ra['events'] = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');   //$ra = array_merge($ra1, $ra2);   foreach($ra as $k=>$v){	   $found = true; // keep replacing as long as the previous round replaced something	   while ($found == true) {	      $val_before = $val;	      for ($i = 0; $i < sizeof($v); $i++) {	         if($k=='events'){	         	$pattern = '/';	         } else{	         	// only detect string if it has aan opening < and no other non whitespace characters	         	//stops the filter inserting nerf into words containg tag names eg.de*script*ion	         	//and when the word is in general use	         	 $pattern = '/(<|&#0{0,8}60|&#[x|X]0{0,8}3c)((&#[x|X]0{0,8}([9ad]);?)|(&#0{0,8}([9|10|13]);?)| )* *';	         }	         for ($j = 0; $j < strlen($v[$i]); $j++) {	            if ($j > 0) {	               $pattern .= '(';	               $pattern .= '(&#[x|X]0{0,8}([9ad]);?)?';	               $pattern .= '|(&#0{0,8}([9|10|13]);?)?';	               $pattern .= ')?';	            }	            $pattern .= $v[$i][$j];	         }	         $pattern .= '/i';	         $replacement = substr($v[$i], 0, 2).'<x>'.substr($v[$i], 2); // add in <x> to nerf the tag	         $val = preg_replace($pattern, $replacement, $val); // filter out the hex tags	         if ($val_before == $val) {	            // no replacements were made, so exit the loop	            $found = false;	         }	      }	   }   }      return $val;}