php+js实现的拖动滑块验证码验证表单操作示例【附源码下载】_PHP教程

本文实例讲述了php+js实现的拖动滑块验证码验证表单操作。分享给大家供大家参考，具体如下：

现在很多网站，比如淘宝，京东等都改用使用极验拖动验证码实现登录，这种方式比传统的验证码方式有更好的体验，减少用户输入的错误，也同样能起到防盗刷的功能。现在很多极验都是第三方的，也很多都是收费的。今天在这里给大家分享自己用原生php实现的一个极验的代码。用原生php的好处就是以后你要嵌套到什么框架，可以直接用核心代码，改一改就好了。

极验拖动动画图

php+js实现的拖动滑块验证码验证表单操作示例【附源码下载】

代码文件截图

php+js实现的拖动滑块验证码验证表单操作示例【附源码下载】

代码实现

html文件

				?

									<!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文件：check.php

				?

									<?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";

									}

									?>

主要核心文件：TnCode.class.php

				?

									<?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);

									  }

									}

									?>