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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