process_chat.php

<?php 
// Backend chat processing

// process_chat.php

// 1. Library and Module Inclusions
include 'libs/gpt4_integration.php';
include 'libs/web_crawler.php';
include 'libs/context_manager.php';
include 'libs/prompt_engineering.php';
include 'libs/security.php';

// 2. Initialization
$responseArray = [];  // To store and send the chatbot response

// 3. Request Handling
if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['message'])) {

    // Sanitize user input
    $userMessage = sanitizeInput($_POST['message']);
    
    // 3.1 Context Processing
    // Here, you could use context management to provide more contextual replies.
    $userMessageWithContext = getChatHistory($userMessage);
    
    // 3.2 Prompt Engineering (if needed)
    // This could be used to modify or enhance the user's prompt for better responses.
    $enhancedPrompt = enhancePrompt($userMessageWithContext);
    
    // 3.3 GPT-4 API Interaction
    $botResponse = getGPT4Response($enhancedPrompt);
    
    // 3.4 Response Handling
    $responseArray['response'] = $botResponse;

    // Here, you could save chat history, manage sessions, etc.
    saveChatHistory($userMessage, $botResponse);
}

// 4. Send the Response
header('Content-Type: application/json');
echo json_encode($responseArray);
<?php // Backend chat processing ?>