updated doc.

11 years ago · c8c6882fc4
1 changed files with 4 additions and 0 deletions
--- a/framework/yii/captcha/CaptchaValidator.php
+++ b/framework/yii/captcha/CaptchaValidator.php
@ -18,6 +18,10 @@ use yii\validators\Validator;
 *
 * CaptchaValidator should be used together with [[CaptchaAction]].
 *
+ * Note that once CAPTCHA validation succeeds, a new CAPTCHA will be generated automatically. As a result,
+ * CAPTCHA validation should not be used in AJAX validation mode because it may fail the validation
+ * even if a user enters the same code as shown in the CAPTCHA image which is actually different from the latest CAPTCHA code.
+ *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */