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：
rush:PHP;">
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($this->image,$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),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($this->image,$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('![\"点击更换图片\">');";](\"')
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,255),255));
imagesetPixel($this->image,$this->width),$this->height),$randColor);
}
}
function setNoiseLine()
{
for($i = 0; $i < $this->noiseNumLine; $i ++) {
$randColor = imageColorAllocate($this->image,255));
imageline($this->image,rand(1,$randColor);
}
}
}
在Controller中，有个admin类，其中有两个方法：
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：
OK. 一切结束，终于正常运行了。
更多关于CodeIgniter相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》、《》、《》、《》、《》及《PHP常见数据库操作技巧汇总》
希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。
