function remove_xss($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-\\x19])/\', \'\', $val);
  // straight replacements, the user should never need these since they\'re normal characters
  // this prevents like <IMG SRC=@avascript:alert(\'XSS\')>
  $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
   // @ @ search for the hex values
   $val = preg_replace(\'/(&#[xX]0{0,8}\'.dechex(ord($search[$i])).\';?)/i\', $search[$i], $val); // with a ;
   // @ @ 0{0,7} matches \'0\' zero to seven times
   $val = preg_replace(\'/(�{0,8}\'.ord($search[$i]).\';?)/\', $search[$i], $val); // with a ;
  }
  // now the only remaining whitespace attacks are \\t, \\n, and \\r
  $ra1 = array(\'javascript\', \'vbscript\', \'expression\', \'applet\', \'meta\', \'xml\', \'blink\', \'link\', \'style\', \'script\', \'embed\', \'object\', \'iframe\', \'frame\', \'frameset\', \'ilayer\', \'layer\', \'bgsound\', \'title\', \'base\');
  $ra2 = 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);
  $found = true; // keep replacing as long as the previous round replaced something
  while ($found == true) {
   $val_before = $val;
   for ($i = 0; $i < sizeof($ra); $i++) {
     $pattern = \'/\';
     for ($j = 0; $j < strlen($ra[$i]); $j++) {
      if ($j > 0) {
        $pattern .= \'(\';
        $pattern .= \'(&#[xX]0{0,8}([9ab]);)\';
        $pattern .= \'|\';
        $pattern .= \'|(&#65533;{0,8}([9|10|13]);)\';
        $pattern .= \')*\';
      }
      $pattern .= $ra[$i][$j];
     }
     $pattern .= \'/i\';
     $replacement = substr($ra[$i], 0, 2).\'&lt;x&gt;\'.substr($ra[$i], 2); // add in &lt;&gt; 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;
}

</pre>
</div>
<p>希望本文所述对大家的php程序设计有所帮助。</p>

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