ChatGPT 3.5 Turbo PHP Script with Memory

<?php
/* 
OpenAI chat with a short-term memory uses the gpt-3.5-turbo language model
By Steve Attewell https://twitter.com/steveattewell
Additional funtions and html added by @ https://terryjett.com

Call this file like this: 
chatgpt-turbo.php?text=what is html5
chatgpt-turbo.php?forget=true&text=what is html5
chatgpt-turbo.php?testmode=true&text=what is html5

Calling ?forget=true to make the AI forget your previous responses before answering

WARNING: HIGHLY ADVISE ADDING PROTEXTION TO PREVENT OTHERS FROM FINDING/USING THIS PHP PAGE. People could use this to drain your OpenAI account!

*/

//Start a session and make sure the user has come from this website

session_start();
$testmode = isset($_GET['testmode']) ? $_GET['testmode'] : null;
$forget = isset($_GET['forget']) ? $_GET['forget'] : null;
if($forget){
  // forget the previous interactions
    $_SESSION['conversations'] = null;
    echo "<br>";
	echo '<div style="text-align:center;"><div style="display:inline-block;max-width:95%;width: 100%;">';
	echo "<h4>Previous Requests Forgotten</h4>";
	echo "</div></div>";
}

// SETUP VARIABLES:
// ===================================

$openai_api_key = 'sk-REPLACE-WITH-YOUR-OPENAI-API-kEY';
// Get your OpenAI API key. Get one from https://platform.openai.com/

$number_of_interactions_to_remember = 5; 
// Gan be 0. Basically a "short term memory". Remembers the last n interactions. Allow you to ask follow-up questions like "tell me more about that" or "give me another example". Not positive on the maximum imposed by OpenAI

// ===================================

if (isset($_POST['text'])) {
    $text = $_POST['text'];
} else 
	if (isset($_POST['forget'])) {
    $text = $_POST['forget'];
} else {
$text = isset($_GET['text']) ? $_GET['text'] : null;
}
if($text){

	//Detect if there is some mention of date or time in the text:
    // Define the keywords to search for
    $keywords = array('time', 'date', 'day is it');

    // Check if the text contains any of the keywords
    $containsKeyword = false;
    $regex = '/\b(' . implode('|', $keywords) . ')\b/i';
    $containsKeyword = preg_match($regex, $text);
    
    // Define getDateTime() to prevent errors
	function getDateTime() {
    return date('Y-m-d H:i:s');
	}
	
	// If the text contains a keyword, call the getWeather() function
    if ($containsKeyword) {
        $datetime = getDateTime(); 
        $text = "It is " . $datetime . ". If appropriate, respond to 
        the following in a short sentence: " . $text;
    }

  // Set up a session variable to store (on remote server) the last n questions and responses
  if (!isset($_SESSION['conversations'])) {
    $_SESSION['conversations'] = array();
  }

  // Remove oldest conversation if the number oif interactions >= $number_of_interactions_to_remember 
  if (count($_SESSION['conversations']) > $number_of_interactions_to_remember + 1) {
    $_SESSION['conversations'] = array_slice($_SESSION['conversations'], -$number_of_interactions_to_remember, $number_of_interactions_to_remember, true);
  }

  // This is the main call we'll send to OpenAI
  $data = array(
    'model' => 'gpt-3.5-turbo',
    'messages' => array(
      array(
        'role' => 'system',
        'content' => 'You are called Chatty McChatface. 
        You give short, friendly reponses. '
      )
    )
  );

  // Adding to the call above, poke in the last 10 message history into the prompt we'll send to openAI
  foreach ($_SESSION['conversations'] as $conversation) {
    foreach ($conversation as $message) {
      array_push($data['messages'], array(
        'role' => $message['role'],
        'content' => $message['content']
      ));
    }
  }

  // Finally add the latest text from the user to the prompt we'll send to openAI chat gpt-3.5-turbo
  array_push($data['messages'], array(
    'role' => 'user',
    'content' => $text
  ));

// make the call to the OpenAI API
  $curl = curl_init();

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

  $response = curl_exec($curl);
	
 //test mode ?testmode=true&text=
 
  if($testmode){
    //write out the previous conversation
    echo "<br><br>";
	echo '<div style="text-align:center;"><div style="display:inline-block;max-width:95%;width: 100%;">';
	echo "<h3>Last  $number_of_interactions_to_remember Raw Responses</h3>";
	echo '<textarea style="width:100%;height:200px;">';
	echo json_encode($data);
	echo '</textarea>';
    //write out the latest response
	echo "<br><br>";
	echo '<h3>Current Raw Prompt Response</h3>';
    echo '<textarea style="width:100%;height:200px;">';
	echo $response;
	echo '</textarea>';
	echo '</div></div><br>';
  }
  $response = json_decode($response, true);
  
  curl_close($curl);

  if (isset($response['choices'][0]['message']['content'])) {
    // The key exists, do something here
    $content = $response['choices'][0]['message']['content'];
  } else {
      // The key doesn't exist
      $content = "Something went wrong! ```" . json_encode($response) . "```";
  }

  // Add new conversation to end of the conversation array (we'll use this in the next prompt so that the AI has a short term memory of our last 10 interactions)
  
  //Make a note of the questions we were just asked, and the response we got back from OpenAI
  $new_conversation = array(
    array(
      'role' => 'user',
      'content' => $text
    ),
    array(
      'role' => 'assistant',
      'content' => $content
    )
  );

  //And push that into our "memory" of the last few interactions (dictated by $number_of_interactions_to_remember ).
  array_push($_SESSION['conversations'], $new_conversation);

  //echo $content;
}
 //the below html can be completely removed and the above echo $content used
?><!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>OpenAI to CKEditor with Memory</title>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootswatch/5.2.3/flatly/bootstrap.min.css" integrity="sha512-q+Sm01IL0q3keoeZkh7cHh6CcUGU0LVwFIf9Il4utcw0oC2MH9mpATEyvuh6dbzDiV8Pw4CXlsT7O1zXFc0LwQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
    <script src="//cdn.ckeditor.com/4.16.1/standard/ckeditor.js"></script>
</head>
<body>
<nav class="navbar bg-light" style="margin-bottom:25px;">
  <div class="container-fluid">
    <a class="navbar-brand" href="https://terryjett.com" target="_blank">ChatGPT gpt-3.5-turbo Example</a>
  </div>
</nav>
<div class="container">
    <h2>Displayed in a CKeditor textarea:</h2>
	<form method="post">
        <textarea id="grabdata" name="editor1">
		<?php
		echo '<pre>';
		echo $content;
		echo '</pre>';
		?>
		</textarea>
        <script>
            CKEDITOR.replace('editor1');
        </script>
    </form>
	<br>
	<h2>Displayed in a plain textarea:</h2>
	<?php
		echo '<textarea id="output" spellcheck="false" style="width:100%;height:300px;" id="copy_text" class="autoExpand alert alert-primary">';
		echo htmlspecialchars($content. "\n");
		echo '</textarea>';
	  ?>
</div>
<br><br>

<!--
Form is experimental and only for proof of concept
I encourage you to make it better!
-->

<div class="container">
	<form>
	  <div class="mb-3">
		<label for="text" class="form-label">Question</label>
		<input type="text" class="form-control" id="text" name="text">
	  </div>
	  <button type="submit" class="btn btn-primary">Submit</button>
	</form>
	<br>
</div>

<div class="container">
	<form>
	  <div class="mb-3">
		<label for="forget" class="form-label">Forget</label>
		<input type="text" class="form-control" id="forget" name="forget" aria-describedby="fogetLast" placeholder"">
		<div id="forgotHelp" class="form-text">Only use to forget last question/response</div>
		<button type="submit" class="btn btn-primary">Submit</button>
	</form>
	<br>
</body>
</html>