CodeIgniter框架验证码类库文件与用法示例

本文实例讲述了CodeIgniter框架验证码类库文件与用法。分享给大家供大家参考，具体如下：

折腾了我四五个小时，终于，ci的验证码类库成功的整出来了。

下面请看源码：

在application/libraries建立Authcode.php文件，代码如下：

    <?php
    class Authcode
    {
     var $CI;
     var $fontPath;//字体路径
     var $image;
     var $charLen   = 4; //生成几位验证码
     var $arrChr   = array();//验证码字符
     var $width    = 83; //图片宽
     var $height   = 24; //图片高
     var $bgcolor   = "#ffffff"; //背景色
     var $showNoisePix  = true; //生成杂点
     var $noiseNumPix  = 80; //生成杂点数量
     var $showNoiseLine  = true; //生成杂线
     var $noiseNumLine  = 2; //生成杂线数量
     var $showBorder  = true; //边框，当杂点、线一起作用的时候，边框容易受干扰
     var $borderColor  = "#000000";
     function Authcode()
     {
      $this->CI = & get_instance();
      $this->fontPath = realpath(dirname(__FILE__) . '/fonts/'); //字体文件
      //$this->arrChr   = array_merge(range(1, 9) , range('A', 'Z'));//数字字母验证码
      //$this->arrChr   = range('A', 'Z');//纯字母验证码
      $this->arrChr = range(0, 9);//纯数字验证码
     }
     /**
      * 显示验证码
      *
      */
     function show()
     {
      $this->image = imageCreate($this->width, $this->height);
      $this->back = $this->getColor($this->bgcolor);
      imageFilledRectangle($this->image, 0, 0, $this->width, $this->height, $this->back);
      $size = $this->width / $this->charLen - 4;
      if ($size > $this->height) {
       $size = $this->height;
      }
      $left = ($this->width - $this->charLen * ($size + $size / 10)) / $size + 5;
      $code = '';
      for($i = 0; $i < $this->charLen; $i ++) {
       $randKey = rand(0, count($this->arrChr) - 1);
       $randText = $this->arrChr[$randKey];
       $code .= $randText;
       $textColor = imageColorAllocate($this->image, rand(0, 100), rand(0, 100), rand(0, 100));
       $font = $this->fontPath . '/' . rand(1, 5) . ".ttf";
       $randsize = rand($size - $size / 10, $size + $size / 10);
       $location = $left + ($i * $size + $size / 10);
       @imagettftext($this->image, $randsize, rand(- 18, 18), $location, rand($size - $size / 10, $size + $size / 10) + 2, $textColor, $font, $randText);
      }
      if ($this->showNoisePix == true) {
       $this->setNoisePix();
      }
      if ($this->showNoiseLine == true) {
       $this->setNoiseLine();
      }
      if ($this->showBorder == true) {
       $this->borderColor = $this->getColor($this->borderColor);
       imageRectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $this->borderColor);
      }
      $this->CI->session->set_userdata('auth_code', $code);
      ob_clean();
      header("Content-type: image/jpeg");
      imagejpeg($this->image);
      imagedestroy($this->image);
     }
     /**
      * 显示验证码的JS调用
      *
      */
     function showScript()
     {
      //显示验证码
      echo "var img_src = '/imgauthcode/show/?';\n";
      echo "document.writeln('<img id=\"img_authcode\" src=\"' + img_src + Math.random() + '\" style=\"cursor:hand;\" onclick=\"this.src=img_src + Math.random();\" alt=\"点击更换图片\">');";
     }
     /**
      * 检查验证码是否正确
      *
      * @param string $auth_code
      * @return bool
      */
     function check($auth_code = null)
     {
      return ($this->CI->session->userdata('auth_code') && $auth_code) ? ($this->CI->session->userdata('auth_code') === $auth_code) : false;
     }
     function getColor($color)
     {
      $color = eregi_replace("^#", "", $color);
      $r = $color[0] . $color[1];
      $r = hexdec($r);
      $b = $color[2] . $color[3];
      $b = hexdec($b);
      $g = $color[4] . $color[5];
      $g = hexdec($g);
      $color = imagecolorallocate($this->image, $r, $b, $g);
      return $color;
     }
     function setNoisePix()
     {
      for($i = 0; $i < $this->noiseNumPix; $i ++) {
       $randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
       imageSetPixel($this->image, rand(0, $this->width), rand(0, $this->height), $randColor);
      }
     }
     function setNoiseLine()
     {
      for($i = 0; $i < $this->noiseNumLine; $i ++) {
       $randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
       imageline($this->image, rand(1, $this->width), rand(1, $this->height), rand(1, $this->width), rand(1, $this->height), $randColor);
      }
     }
    }

Authcode.php代码结束

在Controller中，有个admin类，其中有两个方法：

    Class Admin extends CI_Controller{
     function __construct()
     {
      parent::__construct();
      $this->load->library('Authcode');
     }
    function captcha(){
      if($_POST){
        if ($this->authcode->check($this->input->post('gd_pic'))) {
        echo "right";
       } else {
        echo '验证码不正确，请重新输入';
       }
      }else{
       $this->load->view('demo');
      }
     }
     function show_captcha(){ //此方法用于显示验证码图片，归一个view中的img的src调用
      $this->authcode->show();
     }
    }

下面是在视图view中创建一个demo.php了，代码如下：

    <?php echo form_open('c=admin&m;=captcha');?>
    <input type="text" name="gd_pic" />
    <img src="<?php echo base_url('?c=admin&m;=show_captcha');?>" ><br>
    <input type="submit" name="submit" value="验证" />
    <?php echo form_close();?>

OK. 一切结束，终于正常运行了。

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