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My knowledge of php is not good and I need help.
I have this php form but I don't know how to add a CAPTCHA mechanism.
How do I achieve this?
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To add a CAPTCHA field to your form, open the sidebar inside Google Sheet and expand the Advanced Settings section. Turn on the option that says "Include CAPTCHA" and save your changes.
Create PHP Captcha with GD LibrarySet captcha code in the PHP session. Generate a random number with 6 characters. This will be out security code. Create a basic captcha using the GD library built-in functions.
I really like Securimage is seems to work really well and does not require a third-party external service or javascript (unless you enable the new image feature). Also it can be configured to provide audio captcha for accessibility.
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Check this detailed guide about captcha implementation in PHP: http://www.the-art-of-web.com/php/captcha/
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