php 参数过滤、数据过滤详解

class mysafe{
 public $logname;
 public $isshwomsg;
 function __construct(){ 
  set_error_handler('MyError',E_ALL); 
  //-----
 }
 function MyError($errno, $errstr, $errfile, $errline){  
  echo "<b>Error number:</b> [$errno],error on line $errline in $errfile<br />";
  exit;
 }
 function wlog($logs){
  if(empty($logname)){
   $this->logname=$_SERVER["DOCUMENT_ROOT"]."/log.htm";
  }  
  $Ts=fopen($this->logname,"a+");
  fputs($Ts,$logs."\r\n");
  fclose($Ts);
 }
 function showmsg($msg='',$flag=false){
  $this->isshwomsg=empty($this->isshwomsg) ? false : true;
  if ($this->isshwomsg) {
   echo '<br />--------------------------------------<br />';
   echo $msg;
   echo '<br />--------------------------------------<br />';
   if ($flag) exit;
  } 
 }
 function get_filter(){
  $getfilter="'|(and|or)\\b.+?(>|<|=|in|like)|\\/\\*.+?\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)";
  foreach($_GET as $key=>$value){
   $this->StopAttack($key,$value,$getfilter);
  }
 }
 function post_filter(){
  $postfilter="\\b(and|or)\\b.{1,6}?(=|>|<|\\bin\\b|\\blike\\b)|\\/\\*.+?\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)";
  foreach($_POST as $key=>$value){
   $this->StopAttack($key,$value,$postfilter);
  }
 }
 function cookie_filter(){
  $cookiefilter="\\b(and|or)\\b.{1,6}?(=|>|<|\\bin\\b|\\blike\\b)|\\/\\*.+?\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)";
  foreach($_COOKIE as $key=>$value){
   $this->StopAttack($key,$value,$cookiefilter);
  }
 }
 //过滤参数 
 function StopAttack($StrFiltKey,$StrFiltValue,$ArrFiltReq){
  if(is_array($StrFiltValue)){
   $StrFiltValue=implode($StrFiltValue);
  } 
  if (preg_match("/".$ArrFiltReq."/is",$StrFiltValue)==1){
   $msg="<br><br>操作IP: ".$_SERVER["REMOTE_ADDR"]."<br>操作时间: ".strftime("%Y-%m-%d %H:%M:%S")."<br>操作页面:".$_SERVER["PHP_SELF"]."<br>提交方式: ".$_SERVER["REQUEST_METHOD"]."<br>提交参数: ".$StrFiltKey."<br>提交数据: ".$StrFiltValue; 
   $this->wlog($msg);   
   $this->showmsg($msg);   
   exit();
  }  
 }
 function filter_value_for_sql($str){
  $str = str_replace("and","",$str);
  $str = str_replace("execute","",$str);
  $str = str_replace("update","",$str);
  $str = str_replace("count","",$str);
  $str = str_replace("chr","",$str);
  $str = str_replace("mid","",$str);
  $str = str_replace("master","",$str);
  $str = str_replace("truncate","",$str);
  $str = str_replace("char","",$str);
  $str = str_replace("declare","",$str);
  $str = str_replace("select","",$str);
  $str = str_replace("create","",$str);
  $str = str_replace("delete","",$str);
  $str = str_replace("insert","",$str);
  $str = str_replace("'","",$str);
  $str = str_replace('"',"",$str);
  $str = str_replace(" ","",$str);
  $str = str_replace("or","",$str);
  $str = str_replace("=","",$str);
  $str = str_replace(" ","",$str); 
  return $str;
 }
 //class end
}