PHP 安全检测代码片段(分享)

/**
  * html转换输出（只转义' " 保留html正常运行)
  * @param $param
  * @return string
  */
 function htmlescape($param) {
    return trim(htmlspecialchars($param, ent_quotes));
 }

  /**
  * 是否数组（同时检测数组中是否存在值）
  * @param $params
  * @return boolean
  */
 function isarray($params) {
     return (!is_array($params) || !count($params)) ? false : true;
 }

 /**
  * 变量是否在数组中存在（参数容错， 字符串是否存在于数组中)
  * @param $param
  * @param $params
  * @return boolean
  */
 function inarray($param, $params) {
    return (!in_array((string)$param, (array)$params)) ? false : true;
 }

 /**
  * 通用多类型混合转义函数
  * @param $var
  * @param $strip
  * @param $isarray
  * @return mixture
  */
 function sqlescape($var, $strip = true, $isarray = false) {
    if (is_array($var)) {
        if (!$isarray) return " '' ";
        foreach ($var as $key => $value) {
            $var[$key] = trim(s::sqlescape($value, $strip));
        }
        return $var;
    } elseif (is_numeric($var)) {
         return " '" . $var . "' ";
    } else {
        return " '" . addslashes($strip ? stripslashes($var) : $var) . "' ";
    }
}

     /**
      * 获取服务器变量
      * @param $keys
      * @return string
      */
     function getserver($keys) {
         $server = array();
         $array = (array) $keys;
         foreach ($array as $key) {
             $server[$key] = null;
             if (isset($_server[$key])) {
                 $server[$key] = str_replace(array('<','>','"',"'",'%3c','%3e','%22','%27','%3c','%3e'), '', $_server[$key]);
             }
         }
         return is_array($keys) ? $server : $server[$keys];
     }

     /**
      * 变量转义
      * @param $array
      */
     function slashes(&$array) {
         if (is_array($array)) {
             foreach ($array as $key => $value) {
                 if (is_array($value)) {
                     s::slashes($array[$key]);
                 } else {
                     $array[$key] = addslashes($value);
                 }
             }
         }
     }

     /**
      * 目录转换
      * @param unknown_type $dir
      * @return string
      */
     function escapedir($dir) {
         $dir = str_replace(array("'",'#','=','`','$','%','&',';'), '', $dir);
         return rtrim(preg_replace('/(\/){2,}|(\\\){1,}/', '/', $dir), '/');
     }
     /**
      * 通用多类型转换
      * @param $mixed
      * @param $isint
      * @param $istrim
      * @return mixture
      */
     function escapechar($mixed, $isint = false, $istrim = false) {
         if (is_array($mixed)) {
             foreach ($mixed as $key => $value) {
                 $mixed[$key] = s::escapechar($value, $isint, $istrim);
             }
         } elseif ($isint) {
             $mixed = (int) $mixed;
         } elseif (!is_numeric($mixed) && ($istrim ? $mixed = trim($mixed) : $mixed) && $mixed) {
             $mixed = s::escapestr($mixed);
         }
         return $mixed;
     }
     /**
      * 字符转换
      * @param $string
      * @return string
      */
     function escapestr($string) {
         $string = str_replace(array("\0","%00","\r"), '', $string); //modified@2010-7-5
         $string = preg_replace(array('/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f]/','/&(?!(#[0-9]+|[a-z]+);)/is'), array('', '&'), $string);
         $string = str_replace(array("%3c",'<'), '<', $string);
         $string = str_replace(array("%3e",'>'), '>', $string);
         $string = str_replace(array('"',"'","\t",'  '), array('"',''','    ','  '), $string);
         return $string;
     }
     /**
      * 变量检查
      * @param $var
      */
     function checkvar(&$var) {
         if (is_array($var)) {
             foreach ($var as $key => $value) {
                 s::checkvar($var[$key]);
             }
         } elseif (p_w != 'admincp') {
             $var = str_replace(array('..',')','<','='), array('..',')','<','='), $var);
         } elseif (str_replace(array('<iframe','<meta','<script'), '', $var) != $var) {
             global $basename;
             $basename = 'javascript:history.go(-1);';
             adminmsg('word_error');
         }
     }