ͼƬÑéÖ¤ÂëµÄÔÀíÊÇ·ÀÖ¹¶ñÒâ×¢²á£¬ÊµÏÖ·½·¨
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();
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