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Edit File: process_form.php

<?php
session_start();

error_reporting(E_ALL);
ini_set('display_errors', 0);

header('Content-Type: application/json; charset=utf-8');

require_once "db.php";

function respond($status, $message) {
    echo json_encode([
        "status" => $status,
        "message" => $message
    ]);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    respond("error", "Invalid request.");
}

function clean($data) {
    return htmlspecialchars(trim($data), ENT_QUOTES, 'UTF-8');
}

$name    = clean($_POST['name'] ?? '');
$email   = trim($_POST['email'] ?? '');
$phone   = trim($_POST['phone_number'] ?? '');
$subject = clean($_POST['subject'] ?? '');
$message = clean($_POST['message'] ?? '');

$enteredCaptcha = strtolower(trim($_POST['txtverifycaptcha'] ?? ''));
$sessionCaptcha = strtolower($_SESSION['captcha'] ?? '');

if ($enteredCaptcha === '') {
    respond("error", "Captcha required.");
}

if ($sessionCaptcha === '' || $enteredCaptcha !== $sessionCaptcha) {
    respond("error", "Captcha verification failed.");
}

if (strlen($name) < 3) {
 respond("error", "Please enter a valid name.");
}

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    respond("error", "Please enter a valid email.");
}

if (preg_match("/[\r\n]/", $email)) {
    respond("error", "Invalid email format.");
}

if (!preg_match('/^[6-9]\d{9}$/', $phone)) {
    respond("error", "Please enter a valid mobile number.");
}

$allowedSubjects = [
    "Food Court Management",
    "Catering Services",
    "Events",
    "Brand Tie Ups",
    "Concerts"
];

if (!in_array($subject, $allowedSubjects, true)) {
    respond("error", "Please select a valid subject.");
}

if (strlen($message) < 10) {
 respond("error", "Message must be at least 10 characters.");
}

/* SAVE TO DATABASE */
$stmt = $conn->prepare("
    INSERT INTO contact_enquiries 
    (name, email, phone, subject, message)
    VALUES (?, ?, ?, ?, ?)
");

if (!$stmt) {
    respond("error", "Database error.");
}

$stmt->bind_param("sssss", $name, $email, $phone, $subject, $message);

if (!$stmt->execute()) {
    $stmt->close();
    respond("error", "Failed to save enquiry.");
}

$stmt->close();

use PHPMailer\PHPMailer\PHPMailer;

require 'PHPMailer/src/Exception.php';
require 'PHPMailer/src/PHPMailer.php';
require 'PHPMailer/src/SMTP.php';

$mail = new PHPMailer(true);

try {

$mail->isSMTP();
    $mail->SMTPDebug = 0;

$mail->Host       = "smtp.gmail.com";
    $mail->SMTPAuth   = true;
    $mail->Username   = "info@pinnacle-s.com";
    $mail->Password   = "ffqauvolsyzrwyby";
    $mail->SMTPSecure = "tls";
    $mail->Port       = 587;

$mail->CharSet = "UTF-8";
    $mail->isHTML(true);

$mail->setFrom("info@pinnacle-s.com", "Pinnacle Services");
    $mail->addAddress("info@pinnacle-s.com");
    $mail->addAddress("developers@vervemedia.co.in");

$mail->addReplyTo($email, $name);

$mail->Subject = "New Website Inquiry | Pinnacle Services | " . date("d M Y");

$mail->Body = "
 Hello Team,

You have received a new inquiry from the Pinnacle Services website.

<table cellpadding='8' cellspacing='0' border='1' style='border-collapse:collapse;width:100%;font-family:Arial,sans-serif;font-size:14px;'>
 <tr>
 <td>Name</td>
 <td>{$name}</td>
 </tr>
 <tr>
 <td>Email</td>
 <td>{$email}</td>
 </tr>
 <tr>
 <td>Phone</td>
 <td>{$phone}</td>
 </tr>
 <tr>
 <td>Subject</td>
 <td>{$subject}</td>
 </tr>
 <tr>
 <td>Message</td>
 <td>" . nl2br($message) . "</td>
 </tr>
 </table>

Best regards, Pinnacle Services Website
 ";

$mail->AltBody = "
New Website Inquiry

Name: {$name}
Email: {$email}
Phone: {$phone}
Subject: {$subject}
Message: {$message}
";

$mail->send();

unset($_SESSION['captcha']);

respond("success", "Thank you! Your message has been sent.");

} catch (Exception $e) {
    respond("error", "Mail failed: " . $mail->ErrorInfo);
}