"gregwar/captcha":"1.1.2"
use Gregwar\Captcha\CaptchaBuilder; $builder = new CaptchaBuilder; $builder->build(); $_SESSION['phrase'] = $builder->getPhrase(); header('Content-type: image/jpeg'); $builder->output();
如果想要定制图片宽高,字符个数及哪些字符
$phraseBuilder = new \Gregwar\Captcha\PhraseBuilder(); $builder = new \Gregwar\Captcha\CaptchaBuilder(); $builder->setPhrase($phraseBuilder->build(4,'abcdefghijkmnpqrstuvwxyz123456789'));//4个字符,后面是备选字符 $builder->build(100,30);// 100是宽,30是高 $_SESSION['test_phrase'] = $builder->getPhrase(); //保存在会话中,方便校验 header('Content-type: image/jpeg'); $builder->output(); //实际输出,以图片格式
然后,当用户输入好用户名和密码后,提交后的那个php,先验证用户填写的图形验证码是否是
$_SESSION['phrase'],如不是,则说明用户输入错误或者是机器人。