PHP常用工具函数小结【移除XSS攻击、UTF8与GBK编码转换等】


						本文实例总结了PHP常用工具函数。分享给大家供大家参考，具体如下：

移除XSS攻击脚本





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 .= '~`";:?+/={}[]-_|\'\\';

    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

      $val = preg_replace('/(&#0{0,8}'.ord($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 .= '|(&#0{0,8}([9|10|13]);)';

            $pattern .= ')*';

          }

          $pattern .= $ra[$i][$j];

        }

        $pattern .= '/i';

        $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2); // add in <> 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;

}







GBK转UTF8





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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