php 验证码

 验证码1 需要的背景图片 根据具体情况换代码中路径 第一个可能会出现问题 是找找背景图片的路径问题

<?php

/**
 * Created by PhpStorm.
 * User: DY040
 * Date: 2018/4/24
 * Time: 10:42
 * <?php 置于最左上
 * ?> 不要有结束标记
 * 不要包含其他输出
 * 不要有html
 *
 */
class Captchatool
{
    function __construct()
    {
        $this->imageCode1();
//        var_dump(111);
    }

    public function imageCode1($len = 4, $sess = 'code')
    {

        @session_start();
        $n = $len;
        $mes = '';
        /*创建随机验证码 保存session中*/
        for ($i = 0; $i < $n; $i++) {
            $mes .= dechex(mt_rand(0, 15));

        }

        $_SESSION[$sess] = $mes;


        $bg_file = ROOT_PATH . 'Framework/tool/img/captcha_bg' . mt_rand(1, 5) . '.jpg';//背景图片
        //1创建画布·······························································
        $_img = imagecreatefromjpeg($bg_file);

        $img_w = imagesx($_img); //图宽
        $img_h = imagesy($_img);
        $font_size = 5;
        $font_w = imagefontwidth($font_size);
        $font_h = imagefontheight($font_size);


        //2操作画布·······························································
        //将字符串写入函数
//    imagestring(画布，大小，x,y,内容，颜色)
        for ($i = 0; $i < strlen($mes); $i++) {
            $_rand_color = imagecolorallocate($_img, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));

            imagestring(
                $_img,
                $font_size,
                ($img_w - $n * $font_w) / 2 + $font_w * $i,//x偏移量
                mt_rand(0, 7),
                $mes[$i],
                $_rand_color);

        }

//    3 导出画布

        header("Content-Type:image/jpeg");
        imagejpeg($_img);
//    4销毁画布
        imagedestroy($_img);
    }

    public function imageCode2($n = 4, $sess = 'code', $_width = 75, $_height = 25)

    {
        @session_start();
        $mes = '';
        /*创建随机验证码 保存session中*/

        for ($i = 0; $i < $n; $i++) {
            $mes .= dechex(mt_rand(0, 15));

        }

        $_SESSION[$sess] = $mes;

        /*长和高*/

        /*创建图像*/
        $_img = imagecreatetruecolor($_width, $_height);
        /*画背景颜色*/
        $_white = imagecolorallocate($_img, 255, 255, 255);
        /*填充*/
        imagefill($_img, 0, 0, $_white);
        $_flag = false;
        if ($_flag) {
            /*画边框 黑色*/
            $_black = imagecolorallocate($_img, 0, 0, 0);
            imagerectangle($_img, 0, 0, $_width - 1, $_height - 1, $_black);
        }
//随机画出线条
        for ($i = 0; $i < 8; $i++) {
            $_rand_color = imagecolorallocate($_img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
            imageline(
                $_img,
                mt_rand(0, $_width),
                mt_rand(0, $_height),
                mt_rand(0, $_width),
                mt_rand(0, $_height),
                $_rand_color
            );

        }

        /*随机雪花*/
        for ($i = 0; $i < 80; $i++) {
            $_rand_color = imagecolorallocate($_img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
            /*参数2 字体大小 1-5*/
            imagestring(
                $_img,
                1,
                mt_rand(1, $_width),
                mt_rand(1, $_height),
                '#',
                $_rand_color
            );

        }
        /*输出验证码数字*/
        for ($i = 0; $i < strlen($_SESSION['code']); $i++) {
            /*获取随机颜色*/
            $_rand_color = imagecolorallocate(
                $_img,
                mt_rand(0, 100),
                mt_rand(0, 150),
                mt_rand(0, 200)
            );
            imagestring(
                $_img,
                5,
                $i * $_width / strlen($_SESSION['code']), //每个验证码左偏移量
                $_height / mt_rand(2, 10),//上偏移量
                $_SESSION['code'][$i],
                $_rand_color
            );


        }
        /*输出图像*/
        header("Content-Type:image/png");
        imagepng($_img);
//销毁图像
        imagedestroy($_img);
    }

    public function check_code($code)
    {
        @session_start();
        if ($code === $_SESSION['code']) {
            unset($_SESSION['code']);
            return true;
        } else {
            unset($_SESSION['code']);
            return false;
        }


    }
}

//$a=new Captchatool();
//$a->imageCode1();
//var_dump('我是验证码工具类');