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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