How can PHP developers protect their websites from spam bots using AJAX requests?

Spam bots can be prevented from submitting forms on websites by implementing a CAPTCHA system. This can be done by using Google reCAPTCHA, which requires users to verify that they are not a robot before submitting a form. This can be easily integrated into a website by adding the necessary HTML and JavaScript code provided by Google. 

<?php
// Your PHP form handling code here

// Verify the reCAPTCHA response
$recaptcha_secret = 'YOUR_RECAPTCHA_SECRET_KEY';
$recaptcha_response = $_POST['g-recaptcha-response'];

$response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=$recaptcha_secret&response=$recaptcha_response");
$responseKeys = json_decode($response, true);

if(intval($responseKeys["success"]) !== 1) {
    // Handle invalid reCAPTCHA response
    exit('Invalid reCAPTCHA verification');
}

// Continue processing the form submission

Keywords

PHP AJAX requests spam bots website security protection

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