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±íµ¥auth.html
<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
<title>ÑéÖ¤Âë</title>
</head>
<body>
<h1>ÇëÊäÈëÑéÖ¤Âë</h1>
<form action="check_auth.php" method="post">
   <input name="auth" type="text">
   <img src="auth.php" border="0" />
   <input type="submit" value="Ìá½»">
</form>
</body>
</html>
Éú³ÉÑéÖ¤Âë auth.php
<?php
   session_start();
   header("Content-type:image/png");
   $img_width=100;
   $img_height=20;
   srand(microtime()*100000);
   for($i=0;$i<4;$i++)
   {
        $new_number.=dechex(rand(0,15));
   }
   $_SESSION[check_auth]=$new_number;
   $new_number=imageCreate($img_width,$img_height);//´´½¨Í¼Ïó
   ImageColorAllocate($new_number,255,255,255);  //ÉèÖñ³¾°É«Îª°×É«
   for($i=0;$i<strlen($_SESSION[check_auth]);$i++)
   {
       $font=mt_rand(3,5);
       $x=mt_rand(1,8) + $img_width*$i/4;
       $y=mt_rand(1,$img_height/4);
       $color=imageColorAllocate($new_number,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));//ÉèÖÃ×Ö·ûÑÕÉ«
       imageString($new_number,$font,$x,$y,$_SESSION[check_auth][$i],$color);//Êä³ö×Ö·û
   }
   ImagePng($new_number);
  &nb


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include("renren.php");
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