BotDetect PHP CAPTCHA Validation: Basic PHP CAPTCHA Code Example

CAPTCHA Code Example Description

This BotDetect Captcha PHP code example shows the most basic source code required to protect an PHP form with BotDetect CAPTCHA and validate the user input.

It can be used as a starting point when you are first learning how to use BotDetect.

Free Version Limitations

The free version of BotDetect only includes a limited subset of the available CAPTCHA image styles and CAPTCHA sound styles.
The free version of BotDetect includes a randomized BotDetect™ trademark in the background of 50% of all Captcha images generated.
It also has limited sound functionality, replacing the CAPTCHA sound with "SOUND DEMO" for randomly selected 50% of all CAPTCHA codes.
Lastly, the bottom 10 px of the CAPTCHA image are reserved for a link to the BotDetect website.

These limitations are removed if you upgrade your BotDetect license.