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¶þ¡¢phpÑeÖ¤ÂeÀa£¬secoder.class.php

    <?php 
    /** 
     * °²È«ÑeÖ¤Âe 
     * 
     * °²È«µÄÑeÖ¤ÂeÒª£ºÑeÖ¤ÂeÎÄ×ÖŤÇu¡¢Ðýת£¬Ê¹Óò»Í¬×ÖÌa£¬Ìi¼Ó¸ÉÈÅÂe 
     * 
     * @author Á÷Ë®ÃÏ´º <cmpan(at)qq.com> 
     * @link http://labs.yulans.cn/YL_Security_Secoder 
     * @link http://wiki.yulans.cn/docs/yl/security/secoder 
     */ 
    class YL_Security_Secoder { 
      /** 
       * ÑeÖ¤ÂeµÄsessionµÄϱe 
       * 
       * @var string 
       */ 
      //public static $seKey = 'sid.sek ey.ylans.cn'; 
      public static $seKey = 'sid'; 
      public static $expire = 3000;   // ÑeÖ¤Âe¹ýÆÚʱ¼a£¨s£(C) 
      /** 
       * ÑeÖ¤ÂeÖÐʹÓõÄ×Ö*u£¬01IOÈÝÒ×»iÏý£¬½¨Òe²»Óà 
       * 
       * @var string 
       */ 
      public static $codeSet = '346789ABCDEFGHJKLMNPQRTUVWXY'; 
      public static $fontSize = 25;   // ÑeÖ¤Âe×ÖÌa´oС(px) 
      public static $useCurve = true;  // ÊÇ*ñ»­»iÏýÇuÏß 
      public static $useNoise = true;  // ÊÇ*ñÌi¼ÓÔÓµa  
      public static $imageH = 0;    // ÑeÖ¤ÂeͼƬ¿i 
      public static $imageL = 0;    // ÑeÖ¤ÂeͼƬ³¤ 
      public static $length = 4;    // ÑeÖ¤ÂeλÊý 
      public static $bg = array(243, 251, 254); // ±³¾° 

      protected static $_image = null;   // ÑeÖ¤ÂeͼƬʵÀý 
      protected static $_color = null;   // ÑeÖ¤Âe×ÖÌaÑÕÉ« 

      /** 
       * Êa³oÑeÖ¤Âe²¢°ÑÑeÖ¤ÂeµÄÖµ±£´aeµÄsessionÖÐ 
       * ÑeÖ¤Âe±£´aeµ½sessionµÄ¸ñʽΪ£º $_SESSION[self::$seKey] = array('code' => 'ÑeÖ¤ÂeÖµ', 'time' => 'ÑeÖ¤Âe´´½¨Ê±¼a'); 
       */ 
      public static function entry() { 
        // ͼƬ¿i(px) 
        self::$imageL || self::$imageL = self::$length * self::$fontSize * 1.5 + self::$fontSize*1.5;  
        // ͼƬ¸ß(px) 
        self::$imageH || self::$imageH = self::$fontSize * 2; 
        // ½¨Á¢Ò»*u self::$imageL x self::$imageH µÄͼÏñ 
        self::$_image = imagecreate(self::$imageL, self::$imageH);  
        // ÉeÖñ³¾°    
        imagecolorallocate(self::$_image, self::$bg[0], self::$bg[1], self::$bg[2]);  
        // ÑeÖ¤Âe×ÖÌaËae»uÑÕÉ« 
        self::$_color = imagecolorallocate(self::$_image, mt_rand(1,120), mt_rand(1,120), mt_rand(1,120)); 
        // ÑeÖ¤ÂeʹÓÃËae»u×ÖÌa  
        //$ttf = dirname(__FILE__) . '/ttfs/' . mt_rand(1, 20) . '.ttf'; 4 
        $ttf = dirname(__FILE__) . '/ttfs/4.ttf';  

        if (self::$useNoise) { 
          // »aeÔÓµa 
          self::_writeNoise(); 
        }  
        if (self::$useCurve) { 
          // »ae¸ÉÈÅÏß 
          self::_writeCurve(); 
        } 

        // »aeÑeÖ¤Âe 
        $code = array(); // ÑeÖ¤Âe 
        $codeNX = 0; // ÑeÖ¤ÂeµÚN¸o×Ö*uµÄ×o±ß¾a 
        for ($i = 0; $i<self::$length; $i++) { 
          $code[$i] = self::$codeSet[mt_rand(0, 27)]; 
          $codeNX += mt_rand(self::$fontSize*1.2, self::$fontSize*1.6); 
          // дһ¸oÑeÖ¤Âe×Ö*u 
          imagettftext(self::$_image, self::$fontSize, mt_rand(-40, 70), $codeNX, self::$fontSize*1.5, self::$_color, $ttf, $code[$i]); 
        } 

        // ±£´aeÑeÖ¤Âe 
        isset($_SESSION) || session_start(); 
        $_SESSION[self::$seKey]['code'] = join('', $code); // °ÑУÑeÂe±£´aeµ½session 
        $_SESSION[self::$seKey]['time'] = time(); // ÑeÖ¤Âe´´½¨Ê±¼a 

        header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate'); 
        header('Cache-Control: post-check=0, pre-check=0', false);    
        header('Pragma: no-cache');    
        header("content-type: image/png"); 

        // Êa³oͼÏñ 
        imagepng(self::$_image);  
        imagedestroy(self::$_image); 
      } 

      /** 
       * »­Ò»ÌoÓÉÁ½ÌoÁ¬ÔÚÒ»Æ𹹳ɵÄËae»uÕýÏÒº¯ÊýÇuÏß×÷¸ÉÈÅÏß(Äa¿ÉÒԸijɸu˧µÄÇuÏߺ¯Êý) 
       *    
       *   ¸ßÖеÄÊýѧ¹«Ê½Õ¦¶¼ÍuÁËÄu£¬Ð´³oÀ´ 
       *   ÕýÏÒÐͺ¯Êý½aÎoʽ£ºy=Asin(¦Øx+¦Õ)+b 
       *   ¸÷³£ÊýÖµ¶Ôº¯ÊýͼÏñµÄÓ°Ïi£º 
       *    A£º¾o¶¨*aÖµ£¨¼´×ÝÏoÀ­ÉiѹËoµÄ±¶Êý£(C) 
       *    b£º±iʾ²¨ÐÎÔÚYÖaµÄλÖùØϵ»o×ÝÏoÒƶ¯¾aÀe£¨ÉϼÓϼo£(C) 
       *    ¦Õ£º¾o¶¨²¨ÐÎÓeXÖaλÖùØϵ»oºaÏoÒƶ¯¾aÀe£¨×o¼ÓÓÒ¼o£(C) 
       *    ¦Ø£º¾o¶¨ÖÜÆÚ£¨×iСÕýÖÜÆÚT=2¦Ð/¨O¦Ø¨O£(C) 
       * 
       */ 
      protected static function _writeCurve() { 
        $A = mt_rand(1, self::$imageH/2);         // Õñ*u 
        $b = mt_rand(-self::$imageH/4, self::$imageH/4);  // YÖa*½ÏoÆ«ÒÆÁ¿ 
        $f = mt_rand(-self::$imageH/4, self::$imageH/4);  // XÖa*½ÏoÆ«ÒÆÁ¿ 
        $T = mt_rand(self::$imageH*1.5, self::$imageL*2); // ÖÜÆÚ 
        $w = (2* M_PI)/$T; 

        $px1 = 0; // ÇuÏߺa×ø±eÆðʼλÖà 
        $px2 = mt_rand(self::$imageL/2, self::$imageL * 0.667); // ÇuÏߺa×ø±e½aÊøλÖà       
        for ($px=$px1; $px<=$px2; $px=$px+ 0.9) { 
          if ($w!=0) { 
            $py = $A * sin($w*$px + $f)+ $b + self::$imageH/2; // y = Asin(¦Øx+¦Õ) + b 
            $i = (int) ((self::$fontSize - 6)/4); 
            while ($i > 0) {  
              imagesetpixel(self::$_image, $px + $i, $py + $i, self::$_color); // ÕaÀi»­ÏñËصa±ÈimagettftextºÍimagestringÐÔÄÜÒªºÃºÜ¶a          
              $i--; 
            } 
          } 
        } 

        $A = mt_rand(1, self::$imageH/2);         // Õñ*u     
        $f = mt_rand(-self::$imageH/4, self::$imageH/4);  // XÖa*½ÏoÆ«ÒÆÁ¿ 
        $T = mt_rand(self::$imageH*1.5, self::$imageL*2); // ÖÜÆÚ 
        $w = (2* M_PI)/$T;    
        $b = $py - $A * sin($w*$px + $f) - self::$imageH/2; 
        $px1 = $px2; 
        $px2 = self::$imageL; 
        for ($px=$px1; $px<=$px2; $px=$px+ 0.9) { 
          if ($w!=0) { 
            $py = $A * sin($w*$px + $f)+ $b + self::$imageH/2; // y = Asin(¦Øx+¦Õ) + b 
            $i = (int) ((self::$fontSize - 8)/4); 
            while ($i > 0) {      
              imagesetpixel(self::$_image, $px + $i, $py + $i, self::$_color); // ÕaÀi(while)Ñ­»*»­ÏñËصa±ÈimagettftextºÍimagestringÓÃ×ÖÌa´oСһ´Î»­³o£¨²»ÓÃÕawhileÑ­»*£(C)ÐÔÄÜÒªºÃºÜ¶a   
              $i--; 
            } 
          } 
        } 
      } 

      /** 
       * »­ÔÓµa 
       * ÍuͼƬÉÏд²»Í¬ÑÕÉ«µÄ×Öĸ»oÊý×Ö 
       */ 
      protected static function _writeNoise() { 
        for($i = 0; $i < 10; $i++){ 
          //ÔÓµaÑÕÉ« 
          $noiseColor = imagecolorallocate( 
                   self::$_image,  
                   mt_rand(150,225),  
                   mt_rand(150,225),  
                   mt_rand(150,225) 
                 ); 
          for($j = 0; $j < 5; $j++) { 
            // »aeÔÓµa 
            imagestring( 
              self::$_image, 
              5,  
              mt_rand(-10, self::$imageL),  
              mt_rand(-10, self::$imageH),  
              self::$codeSet[mt_rand(0, 27)], // ÔÓµaÎı¾ÎªËae»uµÄ×Öĸ»oÊý×Ö 
              $noiseColor 
            ); 
          } 
        } 
      } 

      /** 
       * ÑeÖ¤ÑeÖ¤ÂeÊÇ*ñÕýÈ* 
       * 
       * @param string $code Óû§ÑeÖ¤Âe 
       * @param bool Óû§ÑeÖ¤ÂeÊÇ*ñÕýÈ* 
       */ 
      public static function check($code) { 
        isset($_SESSION) || session_start(); 
        // ÑeÖ¤Âe²»ÄÜΪ¿Õ 
        if(empty($code) || empty($_SESSION[self::$seKey])) { 
          //echo $_SESSION[self::$seKey]['code'].'1'; 
          return false; 

        } 
        // session ¹ýÆÚ 
        if(time() - $_SESSION[self::$seKey]['time'] > self::$expire) { 
          unset($_SESSION[self::$seKey]); 
          //echo $_SESSION[self::$seKey]['code'].'2'; 
          return false; 
          //return 0; 
        } 

    //   if($code == $_SESSION[self::$seKey]['code']) { 
        if(strtoupper($code) == $_SESSION[self::$seKey]['code']) { //²»Çø*Ö´oСд±È½Ï 
          //echo $_SESSION[self::$seKey]['code'].'3'; 
          return true;     
        } 
        //echo $_SESSION[self::$seKey]['code'].'4'; 
        return false; 

      } 
    } 


    // useage 
    /* 
    YL_Security_Secoder::$useNoise = false; // Òª¸u°²È«µÄ»°¸Ä³Étrue 
    YL_Security_Secoder::$useCurve = true; 
    YL_Security_Secoder::entry(); 
    */ 

    /* 
    // ÑeÖ¤ÑeÖ¤Âe 
    if (!YL_Security_Secoder::check(@$_POST['secode'])) { 
      print 'error secode'; 
    } 
    */ 

Èý¡¢µ÷Óý¨

1¡¢ÏÔʾÑeÖ¤ÂeÒ³Ãaecode.php

    <?php  
      session_start(); 
      require 'secoder.class.php'; //ÏÈ°ÑÀa°uº¬½øÀ´£¬Êµ¼ÊÂ*¾¶¸u¾Ýʵ¼ÊÇe¿o½øÐÐÐ޸ġ£  
      $vcode = new YL_Security_Secoder();   //ʵÀý»¯Ò»¸o¶ÔÏo  
      $vcode->entry();  
    ?>  

2¡¢¼i²eÑeÖ¤ÂeÊÇñÕýÈ

    <?php  
      session_start(); 
      require 'secoder.class.php'; //ÏÈ°ÑÀa°uº¬½øÀ´£¬Êµ¼ÊÂ*¾¶¸u¾Ýʵ¼ÊÇe¿o½øÐÐÐ޸ġ£  
      $vcode = new YL_Security_Secoder();   //ʵÀý»¯Ò»¸o¶ÔÏo  
      //$vcode->entry();  
      $code = $_GET['code'];  
      echo $vcode->check($code);     
      //$_SESSION['code'] = $vc->getCode();//ÑeÖ¤Âe±£´aeµ½SESSIONÖÐ 
    ?>  

3¡¢ÑeÖ¤ÂeÊaÈe¿oµ÷ÓÃÒ³Ãae

    <img id="messageImg" src='images/tishis2.gif' width='16' height='16'> µ¥»÷ͼƬÖØлñÈ¡ÑeÖ¤Âe<br> 
    <a href="#"><img src="code.php" onclick="javascript:this.src='code.php?tm='+Math.random();" /> 

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