When you generate CAPTCHA Really Simple CAPTCHA creates two files for it one is image file of CAPTCHA and the other is text file.
K5GF. and tests it against the hash includes in the. a7hk3ux8p.txt. issue.
If the two match the answer is confirmed as correct..
You can shift the example parameters as you wish..
Change the type of CAPTCHA image to black $captcha instance->bg = variety 0 0 0.
See really-simple-captcha. php if you are interested in other variables..
Generate image file and text file in the not permanent directory.. $prefix = mt rand $captcha instance->generate image $prefix $word.
Check the risk of the answer.. $correct = $captcha instance->check $prefix $the answer from respondent.
Otherwise block the respondent as it would appear not to be human..
And last remove the image and text issues as they are longer in use.. $captcha instance->remove $prefix.
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