PHP生成图片验证码

分为两个方法函数

    verifyCode = substr($verifyCode, 0, $length);        return $this->verifyCode;    }    /**     * todo:加入字符,生成图片,并加入干扰线，干扰素     * @param int $width 图片宽度     * @param int $height 图片高度     */    public function createImage($width = 80, $height = 30)    {        $verifyCode = $this->verifyCode;        $image      = imagecreatetruecolor($width, $height);        //白色背景        $white = imagecolorallocate($image, 255, 255, 255);        //字体颜色        $fontStyle = imagecolorallocate($image, rand(0, 255), rand(0, 255), rand(0, 255));;        imagefill($image, 0, 0, $white);        // 使用默认字体，无法修改文字大小        // imagestring($image, 5, 10, 10, $verifyCode, $fontStyle);        // 导入自定义字体，修改文字大小        imagettftext($image, 24, 0, 5, 20, $fontStyle, '../microsofthimalaya.ttf', $verifyCode);        //加入干扰点        for ($i = 0; $i < 80; $i++) {            $color = imagecolorallocate($image, rand(0, 255), rand(0, 255), rand(0, 255));            imagesetpixel($image, rand(0, $width), rand(0, $height), $color);        }        //干扰线        for ($i = 0; $i < 5; $i++) {            $color = imagecolorallocate($image, rand(0, 255), rand(0, 255), rand(0, 255));            imageline($image, rand(0, $width), rand(0, $height), rand(0, $width), rand(0, $height), $color);        }        //输出图片        header("Content-type: image/png");        imagepng($image);        //释放资源        imagedestroy($image);    }}?>

实例

$VerifyImage = new VerifyImage();$code = $VerifyImage->createCode();$_SESSION['$VerifyCode'] = $code;$VerifyImage->createImage();