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Japanese characters in Yii Captcha widgets?

Work on the Japanese forum web application made in Yii. The problem is that we are starting to receive some spam mailings in English, since captcha is in English, and anyone who can read it can mainly spam. I would like to have captcha in Japanese kanji, which has a multibyte string type. Has anyone done multibyte captcha in Yii before? Any tips or links will help.

* It would be great if I could pre-define the characters that are displayed, but this is a bonus.

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I found a solution (at least for use in Japanese). Check out Yii veteran softark awesome CCaptcha extension jcaptcha : http://www.yiiframework.com/extension/jcaptcha/

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