In this lecture we will discuss how to integrate chatgpt API to the chatbot

At first we will initialize a session

session_start();

if (!isset($_SESSION['conversation'])) {
    $_SESSION['conversation'] = array(
        array("role" => "system", "content" => "AI prompt here")
    );
}

• session_start(): Starts a new session or resumes an existing session. Sessions allow data to be stored across multiple page requests.
• $_SESSION[‘conversation’]: This array stores the conversation history. It is initialized with a system message (AI prompt) if it doesn’t already exist. The system message typically includes instructions for the AI on how to respond.

Handling POST Requests

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $userMessage = $_POST['userMessage'];
    $_SESSION['conversation'][] = array("role" => "user", "content" => $userMessage);

    $curl = curl_init();
    $payload = json_encode(array(
        "model" => "gpt-4",
        "messages" => $_SESSION['conversation']
    ));

    curl_setopt_array($curl, array(
        CURLOPT_URL => 'https://api.openai.com/v1/chat/completions',
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 0,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => 'POST',
        CURLOPT_POSTFIELDS => $payload,
        CURLOPT_HTTPHEADER => array(
            'Content-Type: application/json',
            'Authorization: Bearer sk-xxxxxxxxxxxxxxxxxxxx'
        ),
    ));

    $response = curl_exec($curl);
    curl_close($curl);

    $responseArray = json_decode($response, true);
    $assistantMessage = $responseArray['choices'][0]['message']['content'];
    $_SESSION['conversation'][] = array("role" => "assistant", "content" => $assistantMessage);

    header('Content-Type: application/json');
    echo json_encode(array('message' => $assistantMessage));
    exit;
}

• if ($_SERVER[‘REQUEST_METHOD’] === ‘POST’): This block executes if the request method is POST.
• $userMessage = $_POST[‘userMessage’]: Retrieves the user’s message from the POST request.
• $_SESSION[‘conversation’][] = array(“role” => “user”, “content” => $userMessage): Adds the user’s message to the session’s conversation array.
• cURL Initialization and Configuration:
  • curl_init(): Initializes a new cURL session.$payload: Creates a JSON-encoded payload containing the model (“gpt-4”) and the conversation history.curl_setopt_array($curl, array(…)): Sets various options for the cURL session:
  • CURLOPT_URL: The URL to send the request to (OpenAI’s chat completion endpoint).
  • CURLOPT_RETURNTRANSFER: Indicates that the response should be returned as a string.
  • CURLOPT_POSTFIELDS: The JSON payload to send in the POST request.
  • CURLOPT_HTTPHEADER: Sets the request headers, including the authorization header with the API key.
• $response = curl_exec($curl): Executes the cURL session and stores the response.
• curl_close($curl): Closes the cURL session.
• $responseArray = json_decode($response, true): Decodes the JSON response from the API into an associative array.
• $assistantMessage = $responseArray[‘choices’][0][‘message’][‘content’]: Extracts the assistant’s message from the response.
• $_SESSION[‘conversation’][] = array(“role” => “assistant”, “content” => $assistantMessage): Adds the assistant’s message to the conversation array.
• header(‘Content-Type: application/json’): Sets the response content type to JSON.
• echo json_encode(array(‘message’ => $assistantMessage)): Sends the assistant’s message as a JSON response.
• exit: Terminates the script execution.

Displaying the Conversation

$conversation = $_SESSION['conversation'] ?? array();

Retrieves the conversation history from the session. If the session variable does not exist, it initializes an empty array.

Complete PHP Code

<?php
session_start();



if (!isset($_SESSION['conversation'])) {
    $_SESSION['conversation'] = array(
        array("role" => "system", "content" => "AI prompt here")
    );
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $userMessage = $_POST['userMessage'];
    $_SESSION['conversation'][] = array("role" => "user", "content" => $userMessage);

    $curl = curl_init();
    $payload = json_encode(array(
        "model" => "gpt-4",
        "messages" => $_SESSION['conversation']
    ));

    curl_setopt_array($curl, array(
        CURLOPT_URL => 'https://api.openai.com/v1/chat/completions',
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 0,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => 'POST',
        CURLOPT_POSTFIELDS => $payload,
        CURLOPT_HTTPHEADER => array(
            'Content-Type: application/json',
            'Authorization: Bearer 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'
        ),
    ));

    $response = curl_exec($curl);
    curl_close($curl);

    $responseArray = json_decode($response, true);
    $assistantMessage = $responseArray['choices'][0]['message']['content'];
    $_SESSION['conversation'][] = array("role" => "assistant", "content" => $assistantMessage);

    header('Content-Type: application/json');
    echo json_encode(array('message' => $assistantMessage));
    exit;
}

$conversation = $_SESSION['conversation'] ?? array();
?>

Add the Javascript event listener to the chat form that triggers when the form is submitted

document.getElementById('chat-form').addEventListener('submit', function(e) {
            e.preventDefault(); // Prevent the default form submission
            handleSubmit();
        });

Complete Code of the Chatbot

 

<?php
session_start();



if (!isset($_SESSION['conversation'])) {
    $_SESSION['conversation'] = array(
        array("role" => "system", "content" => "AI prompt here")
    );
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $userMessage = $_POST['userMessage'];
    $_SESSION['conversation'][] = array("role" => "user", "content" => $userMessage);

    $curl = curl_init();
    $payload = json_encode(array(
        "model" => "gpt-4",
        "messages" => $_SESSION['conversation']
    ));

    curl_setopt_array($curl, array(
        CURLOPT_URL => 'https://api.openai.com/v1/chat/completions',
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 0,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => 'POST',
        CURLOPT_POSTFIELDS => $payload,
        CURLOPT_HTTPHEADER => array(
            'Content-Type: application/json',
            'Authorization: Bearer sk-xxxxxxxxxxxxxxxxxx'
        ),
    ));

    $response = curl_exec($curl);
    curl_close($curl);

    $responseArray = json_decode($response, true);
    $assistantMessage = $responseArray['choices'][0]['message']['content'];
    $_SESSION['conversation'][] = array("role" => "assistant", "content" => $assistantMessage);

    header('Content-Type: application/json');
    echo json_encode(array('message' => $assistantMessage));
    exit;
}

$conversation = $_SESSION['conversation'] ?? array();
?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Chat with Panda AI</title>

    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css" integrity="sha512-z3gLpd7yknf1YoNbCzqRKc4qyor8gaKU1qmn+CShxbuBusANI9QpRohGBreCFkKxLhei6S9CQXFEbbKuqLg0DA==" crossorigin="anonymous" referrerpolicy="no-referrer" />

    <script src="https://code.responsivevoice.org/responsivevoice.js"></script>



    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            margin: 0;
            padding: 0;
        }
        .chat-container {
            max-width: 400px;
            margin: 20px auto;
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        .chat-header {
            background-color: #9c27b0; /* Purple color */
            color: #fff;
            padding: 10px;
            text-align: center;
            font-weight: bold;
            border-top-left-radius: 10px;
            border-top-right-radius: 10px;
        }
        .chat-messages {
            padding: 10px;
            max-height: 400px;
            overflow-y: auto;
        }
        .message {
            margin: 10px 0;
            padding: 10px;
            border-radius: 10px;
        }
        .message.user {
            background-color: #f3e5f5; /* Light purple color */
            text-align: right;
        }
        .message.assistant {
            background-color: #ececec;
        }
        .chat-input {
        display: flex;
        padding: 10px;
        background-color: #f3e5f5; /* Light purple color */
        border-top: 1px solid #e1bee7; /* Border color */
    }
    .chat-input input {
        flex-grow: 1;
        padding: 10px;
        border: 1px solid #e1bee7; /* Border color */
        border-radius: 20px; /* Rounded corners */
        margin-right: 10px;
        outline: none; /* Remove default outline */
        font-size: 16px; /* Font size */
    }
    .chat-input input:focus {
        border-color: #9c27b0; /* Purple color when focused */
    }
    .chat-input button {
        padding: 10px 20px;
        background-color: #9c27b0; /* Purple color */
        color: #fff;
        border: none;
        border-radius: 20px; /* Rounded corners */
        cursor: pointer;
        font-size: 16px; /* Font size */
        outline: none; /* Remove default outline */
        transition: background-color 0.3s; /* Transition effect */
    }
    .chat-input button:hover {
        background-color: #7b1fa2; /* Darker purple color when hovered */
    }
    </style>
</head>
<body>
    <div class="chat-container">
        <div class="chat-header">Chat with Panda AI</div>
        <div class="chat-messages" id="chat-messages">
            <?php foreach ($conversation as $message): ?>
                <?php if ($message['role'] !== 'system'): ?>
                    <div class="message <?php echo $message['role']; ?>">
                        <?php echo $message['content']; ?>
                    </div>
                <?php endif; ?>
            <?php endforeach; ?>
        </div>
        <form id="chat-form" class="chat-input" method="POST">
            <select id="language" class="chat-input input">
                <option value="en-US">English</option>
                <option value="hi-IN">Hindi</option>
                 
                <!-- Add more options as needed -->
            </select>
             

            <button type="button" id="voice-button" onmousedown="startRecording()" onmouseup="stopRecording()"><i class="fa-solid fa-microphone"></i></button>


            <input type="text" class="chat-input" name="userMessage" id="userMessage" placeholder="Type your message or speak..." required>
            <button type="submit"><i class="fa-regular fa-paper-plane"></i></button>
        </form>
    </div>
    <script>
        var recognition = new (window.SpeechRecognition || window.webkitSpeechRecognition || window.mozSpeechRecognition || window.msSpeechRecognition)();
        recognition.lang = 'en-US'; // Default language
        recognition.interimResults = false;
        recognition.maxAlternatives = 1;

        document.getElementById('language').addEventListener('change', function() {
            recognition.lang = this.value;
        });

        function startRecording() {
            console.log('Start recording');
            recognition.start();
        }

        function stopRecording() {
            console.log('Stop recording');
            recognition.stop();
        }

        recognition.onresult = function(event) {
            var speechResult = event.results[0][0].transcript;
            console.log('Recognition result:', speechResult);
            document.getElementById('userMessage').value = speechResult;

            // Call the function that handles the form submission
            handleSubmit();
        };

        function handleSubmit() {
            var userMessage = document.getElementById('userMessage').value;
            if (!userMessage) return; // Prevent empty submissions
            var chatMessages = document.getElementById('chat-messages');

            var userDiv = document.createElement('div');
            userDiv.className = 'message user';
            userDiv.textContent = userMessage;
            chatMessages.appendChild(userDiv);

            // Use fetch to send the POST request
            fetch('', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded',
                },
                body: 'userMessage=' + encodeURIComponent(userMessage)
            })
            .then(response => response.json())
            .then(data => {
                var assistantDiv = document.createElement('div');
                assistantDiv.className = 'message assistant';
                assistantDiv.innerHTML = data.message.replace(/\n/g, '<br>'); // Replace line breaks with <br> tags
                chatMessages.appendChild(assistantDiv);

                // Speak the assistant's response using ResponsiveVoice
                
                responsiveVoice.speak(data.message, "Hindi Male"); // You can change the voice as needed


                // Scroll to the bottom of the chat messages container
                chatMessages.scrollTop = chatMessages.scrollHeight;
            });
            document.getElementById('userMessage').value = '';
        }

        document.getElementById('chat-form').addEventListener('submit', function(e) {
            e.preventDefault(); // Prevent the default form submission
            handleSubmit();
        });

    </script>
</body>
</html>