How do I create a simple human verification field in PHP?

John

New member
The field is like this: What's 22-5? If the person doesn't enter 17 in this case the form doesn't go through and the text writes below the field.
I want the field to be a variable such as 7 or the form won't go through and it'll write the message below the field.
Please include the code. I'm not an expert. I am just working off other people's code I don't know how to write it from scratch. Thanks!
This one is not going to work as it's dynamic I am assuming. I need just a simple function which I can set because I am hosting the php at a different location than the aspx (as that hosting isn't php ready and the source of endless frustration) so when the data posts from the aspx page to the php the captcha is reloaded and therefore incorrect.
 
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