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-\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 .= '~`";:"htmlcode">

function GBKtoUTF8($str)
{
  if(is_array($str))
  {
    foreach ($str as &$value)
    {
      $value = GBKtoUTF8($value);
    }
    return $str;
  }elseif(is_string($str)){
    $str = iconv("GB18030", "UTF-8//IGNORE", $str);
    return $str;
  }else{
    return $str;
  }
}




UTF8转GBK


function UTF8toGBK(&$str)
{
  if(is_array($str))
  {
    foreach ($str as &$value)
    {
      $value = UTF8toGBK($value);
    }
    return $str;
  }elseif (is_string($str)){
    $str = iconv("UTF-8", "GB18030//IGNORE", $str);
    return $str;
  }else{
    return $str;
  }
}




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