Chinese character verification code and formula verification code, Chinese character verification code formula _ PHP Tutorial

Chinese character verification code and formula verification code. The Chinese character verification code and the formula verification code. the Chinese character verification code formula everyone knows that a simple number or letter verification code is easy to crack. However, the formula verification code or Chinese character verification code is not easy to be used by the Chinese character verification code and the formula verification code.

We all know that simple numbers or letter verification codes are easily cracked, but computation verification codes or Chinese character verification codes are not easy to crack,

Therefore, we recommend that you use the formula verification code or Chinese character verification code whenever possible when using the verification code.

The following are two types of verification code I have written. For more information, see:

Reproduced from: http://www.phpskill.com/html/show-1-4410-1.html

1. formula verification code:

2. Chinese character verification code:

 
Attached font file: simhei.rar
Note:
The Chinese character verification code is executed separately. if you obtain the session, the verification code is inconsistent with the session content. However, when the Chinese character verification code file is referenced in the src attribute of the img label, the session is obtained. in this case, the content of the two is consistent.
The reason is ominous. if any of you know, please leave a message below!
Reproduced from: http://www.phpskill.com/html/show-1-4410-1.html
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Everyone knows that simple numbers or letter verification codes can be easily cracked, but the formula verification code or Chinese character verification code cannot be easily cracked...