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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