Key Features:

• Server-Side Validation:
  Ensures all form inputs are valid before processing (e.g., valid email format, required fields). Prevents malicious or incomplete submissions.
• Email Confirmation:
  Subscribers receive a confirmation email with a unique token to prevent spam and ensure valid email addresses.
• Welcome Email:
  Subscribers receive a Welcome email after confirmation is successful.
• Dual Storage:
  Subscriptions are saved to both your local MySQL database and Mailchimp (configurable via .env).
• Anti-Spam Measures:
  Built-in CSRF tokens and input sanitization to protect against spam and malicious attacks.
• User Feedback:
  Displays success or error messages to users after form submission.
• Security:
  Sanitizes and validates all inputs to prevent SQL injection and XSS attacks. Uses secure tokens for email confirmation links.

How It Works in the Template

• Front-End Form: HTML form with fields for email (and optionally name).
• Email Confirmation: Sends a confirmation email with a unique token to verify the subscriber's email address.
• Database Integration: Subscriptions are logged in the subscribers table.
• Mailchimp Integration: Subscriptions are synced with Mailchimp (optional).

Example Subscription Form Structure:

<?php
session_start();

require __DIR__ . '/../vendor/autoload.php';
$config = require_once 'config/config.php';

// PHPMailer classes
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;


function logDebug($message)
{
$logDir = __DIR__ . '/logs';
// Create logs directory if it doesn't exist
if (!file_exists($logDir)) {
mkdir($logDir, 0755, true); // 0755 permissions (adjust if needed)
}

$logFile = $logDir . '/sub-debug.log';
$timestamp = date('Y-m-d H:i:s');
file_put_contents($logFile, "[{$timestamp}] {$message}\n", FILE_APPEND);
}

if (!$config) {
logDebug("Configuration file error");
echo json_encode(['status' => 'error', 'message' => 'Configuration file not found or invalid.']);
exit();
}