CI框架里用的验证码

自带那个不太喜欢，于是另外折腾了个

 <?php
if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class vcode extends CI_Model {

//    private $charset = "abcdefghizklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";   //随机因子  
    private $charset = "1234567890";   //随机因子  
    private $code;  //验证码文字
    private $codelen = 4; //验证码显示几个文字
    private $width = 75;   //验证码宽度
    private $height = 25;   //验证码高度
    private $img;    //验证码资源句柄
    private $font;  //指定的字体
    private $fontsize = 16;  //指定的字体大小
    private $fontcolor;  //字体颜色  随机

    //构造类  编写字体

    public function __construct() {
        parent::__construct();
        $this->font = APPPATH . 'font/LiberationSans-Bold.ttf';
    }

    //创建4个随机码
    private function createCode() {
        $_leng = strlen($this->charset) - 1;
        for ($i = 0; $i < $this->codelen; $i++) {
            $this->code.=$this->charset[mt_rand(0, $_leng)];
        }
        return $this->code;
    }

    //创建背景
    private function createBg() {
        //创建画布 给一个资源jubing
        $this->img = imagecreatetruecolor($this->width, $this->height);
        //背景颜色
        $color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
        //画出一个矩形
        imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color);
    }

    //创建字体
    private function createFont() {
        $_x = ($this->width / $this->codelen);   //字体长度
        for ($i = 0; $i < $this->codelen; $i++) {
            //文字颜色
            $color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
            //资源句柄 字体大小 倾斜度 字体长度  字体高度  字体颜色  字体  具体文本
            imagettftext($this->img, $this->fontsize, mt_rand(-18, 18), $_x * $i + mt_rand(1, 5), $this->height/1.2, $color, $this->font, $this->code[$i]);
        }
    }

    //随机线条
    private function createLine() {
        //随机线条
        for ($i = 0; $i < 6; $i++) {
            $color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
            imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
        }
//        //随机雪花
//        for ($i = 0; $i < 45; $i++) {
//            $color = imagecolorallocate($this->img, mt_rand(220, 255), mt_rand(220, 255), mt_rand(220, 255));
//            imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '.', $color);
//        }
    }

    //输出背景
    private function outPut() {
        //生成标头
        header("Expires: -1");
        header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
        header("Pragma: no-cache");
        header('Content-Type:image/png');
        //输出图片
        imagepng($this->img);
        //销毁结果集
        imagedestroy($this->img);
    }

    //对外输出
    public function doimg() {
        //加载背景
        $this->createBg();
        //加载文件
        $this->createCode();
        //加载线条
        $this->createLine();
        //加载字体
        $this->createFont();
        //加载背景
        $this->outPut();
    }

    //获取验证码
    public function getCode() {
        return strtolower($this->code);
    }

}

使用方法如下

 <?php
public function create_vcode() {
    $this->load->model('vcode');
    echo $this->vcode->doimg();
    $cookie = array(
        'name' => 'vcode',
        'value' => $this->common->authCode($this->vcode->getCode(), 'ENCODE', _KEY),
        'expire' => '1800',
    );
    $this->input->set_cookie($cookie);
    die;
}

字体文件在此
LiberationSans-Bold.ttf