How to send spam information to the anti-posting machine?

I recently made a local portal website for sending spam information on the anti-Post machine, but there are always spam posts that I can't do in several ways, for example, if the fields of the submitted table are modified and the submitted path and file name are all analyzed by the poster, is there any better way? Thank you !, However, you have recently published a machine that can read the verification code. It can be easily downloaded. Finally, I used the arithmetic questions and how to use rand () to send spam information on the anti-posting machine.
Recently I made a local portal website, but there is always a posting machine that keeps posting junk information. I have used several methods, such as modifying the fields in the submission table, the submitted path and file name have been analyzed by the poster. Is there any better way? Thank you!

------ Solution --------------------
However, you have recently published a machine that can read the verification code. It can be easily downloaded. Finally, I used arithmetic questions,
Use rand () to generate two numbers, perform arithmetic operations (addition, simple subtraction), and pass them to the verification page through session.

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