Using Captcha in Cakephp to implement more secure verification codes

First, you can use the following program to get the verification code image. Note that the session variable is adjusted when the program generates the image.

getImage.php

include('kcaptcha.php');

session_start();

$captcha = new KCAPTCHA();

$_SESSION['captcha_keystring'] = $captcha->getKeyString();

?>

Next, call the verification code image through the following form, and verify whether the user input matches the verification code image value.

index.php

session_start();

$true_key_string = $_SESSION['captcha_keystring'];

echo $true_key_string;

?>

if(isset($_SESSION['captcha_keystring']) && $true_key_string == $_POST['keystring'])

{

echo "Correct";

}else

{

echo "Wrong";

}

?>