Are there best practices for securing PHP contact forms to prevent spam and server abuse?

One common way to secure PHP contact forms is to implement CAPTCHA verification to prevent spam and server abuse. This can be done by using a CAPTCHA service like Google reCAPTCHA, which requires users to complete a challenge to prove they are not a bot. By integrating CAPTCHA into your contact form, you can significantly reduce the amount of spam submissions and protect your server from abuse. 

<?php
// Verify CAPTCHA response
$secretKey = "YOUR_SECRET_KEY";
$responseKey = $_POST['g-recaptcha-response'];
$userIP = $_SERVER['REMOTE_ADDR'];

$url = "https://www.google.com/recaptcha/api/siteverify?secret=$secretKey&response=$responseKey&remoteip=$userIP";
$response = file_get_contents($url);
$responseKeys = json_decode($response, true);

if(intval($responseKeys["success"]) !== 1) {
    // CAPTCHA verification failed
    die("CAPTCHA verification failed. Please try again.");
}

// Process the contact form submission
// Your code to handle form data goes here

?>

Keywords

PHP contact form spam prevention server abuse security

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