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    <?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'; 
    } 
    */

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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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