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($val) {    // remove all non-printable characters. cr(0a) and lf(0b) and tab(9) are allowed    // this prevents some character re-spacing such as <java
function removexss($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])/', '', $val);// straight replacements, the ur should never need the since they're normal characters// this prevents like <img src=@avascript:alert('xss')>$arch = 'abcdefghijklmnopqrstuvwxyz';$arch .= 'abcdefghijklmnopqrstuvwxyz';$arch .= '1234567890!@#$%^&*()';$arch .= '~`";:?+/={}[]-_|\窃书记'\\';for ($i = 0; $i < strlen($arch); $i++) {// ;? matches the ;, which is optional// 0{0,7} matches any padded zeros, which are optional and go up to 8 chars// @ @ arch for the hex values$val = preg_replace('/(&#[xx]0{0,8}'.dechex(ord($arch[$i])).';?)/i', $arch[$i], $val); // with a ;// @ @ 0{0,7} matches '0' zero to ven times$val = preg_replace('/({0,8}'.ord($arch[$i]).';?)/', $arch[$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', 'framet', 'ilayer', 'layer', 'bgsound', 'title', 'ba');$ra2 = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrollect', 'oncopy', 'oncut', 'ondataavailable', 'ondatatchanged', 'ondatatcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlocapture', 'onmoudown', 'onmouenter', 'onmouleave', 'onmoumove', 'onmouout', 'onmouover', 'onmouup', 'onmouwheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onret', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinrted', 'onscroll', 'onlect', 'onlectionchange', 'onlectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');$ra = array_merge($ra1, $ra2);$found = true; // keep replacing as long as the previous round replaced somethingwhile ($found == true) {$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 .= '|({0,8}([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, $val); // filter out the hex tagsif ($val_before == $val) {// no replacements were made, so exit the loop$found = fal;}}}return $val;}
script>    // 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 ur should never need the since they're normal characters    // this prevents like <img src=@avascript:alert('xss')>    $arch = 'abcdefghijklmnopqrstuvwxyz';    $arch .= 'abcdefghijklmnopqrstuvwxyz';    $arch .= '1234567890!@#$%^&*()';    $arch .= '~`";:?+/={}[]-_|\'\\';    for ($i = 0; $i < strlen($arch); $i++) {      // ;? matches the ;, which is optional      // 0{0,7} matches any padded zeros, which are optional and go up to 8 chars      // @ @ arch for the hex values      $val = preg_replace('/(&#[xx]0{0,8}'.dechex(ord($arch[$i])).';?)/i', $arch[$i], $val); // with a ;      // @ @ 0{0,7} matches '0' zero to ven times      $val = preg_replace('/({0,8}'.ord($arch[$i]).';?)/', $arch[$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', 'fra狗为什么不能吃巧克力met', 'ilayer', 'layer', 'bgsound', 'title', 'ba');    $ra2 = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange'打假办, 'onclick', 'oncontextmenu', 'oncontrollect', 'oncopy', 'oncut', 'ondataavailable', 'ondatatchanged', 'ondatatcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlocapture', 'onmoudown', 'onmouenter', 'onmouleave', 'onmoumove', 'onmouout', 'onmouover', 'onmouup', 'onmouwheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechang世界黑社会老大排行榜e', 'onret', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinrted', 'onscroll', 'onlect', 'onlectionchange', 'onlectstart', '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 .= '|({0,8}([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, $val); // fil西塞山怀古　　ter out the hex tags        if ($val_before == $val) {          // no replacements were made, so exit the loop          $found = fal;        }      }    }    return $val;}

gbk转utf8

function gbktoutf8($str){  if(is_array($str))  {    foreach ($str as &$value)    {      $value = gbktoutf8($value);    }    return $str;  }elif(is_string($str)){    $str = iconv("gb18030", "utf-8//ignore", $str);    return $str;  }el{    return $str;  }}

utf8转gbk

function utf8togbk(&$str){  if(is_array($str))  {    foreach ($str as &$value)    {      $value = utf8togbk($value);    }    return $str;  }elif (is_string($str)){    $str = iconv("utf-8", "gb18030//ignore", $str);    return $str;  }el{    return $str;  }}

更多关于php相关内容感兴趣的读者可查看本站专题：《php编码与转码操作技巧汇总》、《php数组(array)操作技巧大全》、《php字符串(string)用法总结》、《php常用函数与技巧总结》及《php错误与异常处理方法总结》

希望本文所述对大家php程序设计有所帮助。