!DOCTYPE html>
html lang="">
head>
  meta charset="utf-8">
  meta http-equiv="x-ua-compatible" content="ie=edge">
  meta name="viewport" content="width=device-width, initial-scale=1">
  title>极验滑块拖动验证码-码农社区-web视频分享网/title>
  script type="text/javascript" src="tn_code.js?v=35">/script>
  link rel="stylesheet" type="text/css" href="style.css?v=27" rel="external nofollow" />
style type="text/css">/style>
/head>
body style="text-align:center;">
div class="tncode" style="text-align: center;margin: 100px auto;">/div>
script type="text/javascript">
$TN.onsuccess(function(){
//验证通过
});
/script> 

?php
require_once dirname(__FILE__).'/TnCode.class.php';
$tn = new TnCode();
if($tn->check()){
    $_SESSION['tncode_check'] = 'ok';
  echo "ok";
}else{
    $_SESSION['tncode_check'] = 'error';
  echo "error";
}

?>

?php
class TnCode
{
  var $im = null;
  var $im_fullbg = null;
  var $im_bg = null;
  var $im_slide = null;
  var $bg_width = 240;
  var $bg_height = 150;
  var $mark_width = 50;
  var $mark_height = 50;
  var $bg_num = 6;
  var $_x = 0;
  var $_y = 0;
  //容错象素 越大体验越好，越小破解难道越高
  var $_fault = 3;
  function __construct(){
    //ini_set('display_errors','On');
    //
    error_reporting(0);
    if(!isset($_SESSION)){
      session_start();
    }
  }
  function make(){
    $this->_init();
    $this->_createSlide();
    $this->_createBg();
    $this->_merge();
    $this->_imgout();
    $this->_destroy();
  }

  function check($offset=''){
    if(!$_SESSION['tncode_r']){
      return false;
    }
    if(!$offset){
      $offset = $_REQUEST['tn_r'];
    }
    $ret = abs($_SESSION['tncode_r']-$offset)=$this->_fault;
    if($ret){
      unset($_SESSION['tncode_r']);
    }else{
      $_SESSION['tncode_err']++;
      if($_SESSION['tncode_err']>10){//错误10次必须刷新
        unset($_SESSION['tncode_r']);
      }
    }
    return $ret;
  }

  private function _init(){
    $bg = mt_rand(1,$this->bg_num);
    $file_bg = dirname(__FILE__).'/bg/'.$bg.'.png';
    $this->im_fullbg = imagecreatefrompng($file_bg);
    $this->im_bg = imagecreatetruecolor($this->bg_width, $this->bg_height);
    imagecopy($this->im_bg,$this->im_fullbg,0,0,0,0,$this->bg_width, $this->bg_height);
    $this->im_slide = imagecreatetruecolor($this->mark_width, $this->bg_height);
    $_SESSION['tncode_r'] = $this->_x = mt_rand(50,$this->bg_width-$this->mark_width-1);
    $_SESSION['tncode_err'] = 0;
    $this->_y = mt_rand(0,$this->bg_height-$this->mark_height-1);
  }

  private function _destroy(){
    imagedestroy($this->im);
    imagedestroy($this->im_fullbg);
    imagedestroy($this->im_bg);
    imagedestroy($this->im_slide);
  }
  private function _imgout(){
    if(!$_GET['nowebp']function_exists('imagewebp')){//优先webp格式，超高压缩率
      $type = 'webp';
      $quality = 40;//图片质量 0-100
    }else{
      $type = 'png';
      $quality = 7;//图片质量 0-9
    }
    header('Content-Type: image/'.$type);
    $func = "image".$type;
    $func($this->im,null,$quality);
  }
  private function _merge(){
    $this->im = imagecreatetruecolor($this->bg_width, $this->bg_height*3);
    imagecopy($this->im, $this->im_bg,0, 0 , 0, 0, $this->bg_width, $this->bg_height);
    imagecopy($this->im, $this->im_slide,0, $this->bg_height , 0, 0, $this->mark_width, $this->bg_height);
    imagecopy($this->im, $this->im_fullbg,0, $this->bg_height*2 , 0, 0, $this->bg_width, $this->bg_height);
    imagecolortransparent($this->im,0);//16777215
  }

  private function _createBg(){
    $file_mark = dirname(__FILE__).'/img/mark.png';
    $im = imagecreatefrompng($file_mark);
    header('Content-Type: image/png');
    //imagealphablending( $im, true);
    imagecolortransparent($im,0);//16777215
    //imagepng($im);exit;
    imagecopy($this->im_bg, $im, $this->_x, $this->_y , 0 , 0 , $this->mark_width, $this->mark_height);
    imagedestroy($im);
  }

  private function _createSlide(){
    $file_mark = dirname(__FILE__).'/img/mark2.png';
    $img_mark = imagecreatefrompng($file_mark);
    imagecopy($this->im_slide, $this->im_fullbg,0, $this->_y , $this->_x, $this->_y, $this->mark_width, $this->mark_height);
    imagecopy($this->im_slide, $img_mark,0, $this->_y , 0, 0, $this->mark_width, $this->mark_height);
    imagecolortransparent($this->im_slide,0);//16777215
    //header('Content-Type: image/png');
    //imagepng($this->im_slide);exit;
    imagedestroy($img_mark);
  }

}
?>