What are some alternatives to using Captchas for spam prevention in PHP forms?

One alternative to using Captchas for spam prevention in PHP forms is implementing a honeypot technique. This involves adding a hidden field to the form that only bots would fill out, allowing you to reject submissions with data in that field. Another option is to use time-based techniques, such as setting a minimum time limit for form submissions to prevent automated submissions. 

// Honeypot technique
<form action="submit.php" method="post">
    <input type="text" name="name">
    <input type="email" name="email">
    <input type="hidden" name="honeypot" style="display:none">
    <button type="submit">Submit</button>
</form>

<?php
// Form submission handling
if($_POST['honeypot'] !== '') {
    // This submission is likely from a bot, reject it
    die('Spam detected');
} else {
    // Process the form submission
}
?>

Keywords

Google reCAPTCHA Honeypot technique Akismet API SpamAssassin Form validation

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