Usage : Your Captcha image src should point to captcha.php
Check : compare your user input with $_SESSION['secret']
Example check if(!empty($_POST['input']) && $_POST['input'] == $_SESSION['secret']){ echo 'good'; }else{ echo 'wrong'; }
#Note : You can edit this class and use it as you want , This class will generate an image with numbers and random lines over these numbers to insure human usage <3