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Attach the Chinese character verification code and formula Verification Code

Source: Internet
Author: User
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Provides various official and user-released code examples. For code reference, you are welcome to exchange and learn that the verification code provided by thinkphp is not very good. The following is the source code of the computing verification code and the Chinese character verification code.
Simple numbers or letter verification codes can be easily cracked, but computation verification codes or Chinese Character verification codes are not so easy to crack. Therefore, when using verification codes, try to use the formula verification code or Chinese Character verification code. Click to view the formula verification code and Chinese Character verification code source code:
Verification Code (White Moon Network)

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