What are the benefits of storing captcha values in sessions rather than regenerating them on form submission in PHP?

Storing captcha values in sessions rather than regenerating them on form submission in PHP can improve user experience by preventing users from having to re-enter the captcha value if there are form validation errors. It also helps prevent users from submitting the form multiple times with different captcha values, which can help reduce spam submissions. 

// Start the session
session_start();

// Generate and store captcha value in session
$_SESSION['captcha'] = generateCaptcha();

// Validate captcha value on form submission
if(isset($_POST['captcha']) && $_POST['captcha'] === $_SESSION['captcha']) {
    // Captcha validation passed
} else {
    // Captcha validation failed
}

Keywords

captcha sessions form submission regeneration PHP

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