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ÑéÖ¤Â룺<input type="text" name="yanzhengma" />
<iframe src="code/middle.php" height="20px" width="65px" frameborder="0" id="chkimg" scrolling="no" style=" margin-top:5px">
</iframe>
<a  href="javascript:chkimg.location.reload();">¿´²»Ç壬»»Ò»ÕÅ</a>
 
code/middle.phpÖеĴúÂ룺
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />
<title>Insert title here</title>
</head>
<body style="margin:0; padding:0">
  <img src="code.php" />
       
</body>
</html>
 
code.phpÖеĴúÂ룺
<?php
/*---------------×ÏÉ«·çÁå--------------
*  Info:ÑéÖ¤ÂëÉú²ú³ÌÐò£»
*  Autore: gb2312
*  Time £º 10-1-7 13:10;
*-------------------------------------*/
session_start();
function yanzheng()
{
         $shumu = 4;
         define("shumu","$shumu" );
         $vchar =array( 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z);
         for($i=0; $i<shumu; $i++)
         {
          
            $suiji=$suiji.$vchar[mt_rand(0,61)];
          
         }
         if (strlen($suiji)!=4)
         yanzheng();
     &n


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