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Editor to share with you how to achieve PHP CAPTCHA, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

Verification code example

2. Php authentication code class, secoder.class.php

2. Check whether the verification code is correct

3. CAPTCHA input box call page

Click the picture to get the CAPTCHA again

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