chat Privé entre deux personnes

pour les tests j'appelle les messages comme ça

http://www.monsite.com/chat.php?user_from=1&user_to=3

mais comme c'est une messagerie instantanée si l'utilisateur 3 ne voit pas les messages sauf si c'est lui qui les envoi et idem pour l'utilisateur 2

un exemple ici https://www.deuxtoiamoi.com/test/cha...id=3&user_to=1

la page d'appelle des fonctions :

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<?php
 
 
 
/**
 * Description of FbChatMock
 *
 * @author Tamil
 */
 
 $cUserId = $_SESSION["user_id"];
 $cUserIdto =  $_SESSION["user_to"];
 
class FbChatMock {
 
  // Holds the database connection
  private $dbConnection;
 
  //----- Database connection details --/
  //-- Change these to your database values
 
  private $_dbHost = 'madaimmola01.mysql.db';
 
  private $_dbUsername = 'madaimmola01';
 
  private $_dbPassword = 'Didilulu31';
 
  public $_databaseName = 'madaimmola01';
 
  //----- ----/
 
  /**
   * Create's the connection to the database and stores it in the dbConnection
   */
  public function __construct() {
    $this->dbConnection = new mysqli($this->_dbHost, $this->_dbUsername, 
        $this->_dbPassword, $this->_databaseName);
 
    if ($this->dbConnection->connect_error) {
      die('Connection error.');
    }
  }
 
  /**
   * Get the list of messages from the chat
   * 
   * @return array
   */
 
 
  public function getMessages() {
 $cUserId = $_SESSION["user_id"];
 $cUserIdto =  $_SESSION["user_to"];
 
    $messages = array();
    $query = <<<QUERY
        SELECT 
          `chats`.`message`, 
          `chats`.`sent_on`,
          `membre`.`id`, 
          `membre`.`pseudo`
        FROM `membre`
        JOIN `chats`
          ON `chats`.`user_id` = `membre`.`id`
        WHERE `chats`.`user_id` = '$cUserId' AND `chats`.`user_to` = '$cUserIdto' OR `chats`.`user_to` = '$cUserIdto' AND `chats`.`user_id` = '$cUserId' ORDER BY `sent_on`
QUERY;
 
 
    // Execute the query
    $resultObj = $this->dbConnection->query($query);
    // Fetch all the rows at once.
    while ($row = $resultObj->fetch_assoc()) {
      $messages[] = $row;
    }
 
    return $messages;
  }
 
  /**
   * Add a new message to the chat table
   * 
   * @param Integer $userId The user who sent the message
   * @param String $message The Actual message
   * @return bool|Integer The last inserted id of success and false on faileur
   */
  public function addMessage($userId, $message) {
    $addResult = false;
 
    $cUserId = $_SESSION["user_id"];
 $cUserIdto =  $_SESSION["user_to"];
    // Escape the message with mysqli real escape
    $cMessage = $this->dbConnection->real_escape_string($message);
 
    $query = <<<QUERY
      INSERT INTO `chats`(`id`, `user_id`, `message`, `sent_on`, `user_to`)
      VALUES ('', {$cUserId}, '{$cMessage}', UNIX_TIMESTAMP(), {$cUserIdto})
QUERY;
 
    $result = $this->dbConnection->query($query);
 
    if ($result !== false) {
      // Get the last inserted row id.
      $addResult = $this->dbConnection->insert_user_id;
    } else {
      echo $this->dbConnection->error;
    }
 
    return $addResult;
  }
 
}

et Get_message.php qui est appelle aussi les message

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<?php
session_start();
 
require_once __DIR__ . '/../../core/FbChatMock.php';
 
$chat = new FbChatMock();
$messages = $chat->getMessages();
$chat_converstaion = array();
 
 
 
 
$pdo = new PDO('mysql:host=madaimmola01.mysql.db;dbname=madaimmola01','madaimmola01','Didilulu31');
 
    $sql = "SELECT COUNT(*) AS nb FROM chats where user_id='$cUserId' and user_to='$cUserIdto' or user_to='$cUserIdto' and user_id='$cUserId' ";
    $result = $pdo->query($sql);
    $columns = $result->fetch();
    $nb = $columns['nb'];
 
 
 
if ($nb >= "1") {
  $chat_converstaion[] = '<table>';
  foreach ($messages as $message) {
    $msg = htmlentities($message['message'], ENT_NOQUOTES);
    $user_name = ucfirst($message['pseudo']);
    $sent = date('F j, Y, g:i a', $message['sent_on']);
    $chat_converstaion[] = <<<MSG
      <tr class="msg-row-container">
        <td>
          <div class="msg-row">
            <div class="avatar"></div>
            <div class="message">
              <span class="user-label"><a href="#" style="color: #6D84B4;">{$user_name}</a> <span class="msg-time">{$sent}</span></span><br/>{$msg}
            </div>
          </div>
        </td>
      </tr>
MSG;
  }
  $chat_converstaion[] = '</table>';
} else {
  echo '<span style="margin-left: 25px;">Pas de messages ici :D</span>';
}
 
echo implode('', $chat_converstaion);
?>

la page index

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<?php
    session_start();
 
?>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title></title>
    <!--    <link href="style/bootstrap.min.css" rel="stylesheet" type="text/css" />
        <link href="style/bootstrap-theme.min.css" rel="stylesheet" type="text/css" />-->
    <link href="style/jquery-ui-1.10.4.custom.min.css" rel="stylesheet" type="text/css" />
    <!--    <link href="style/non-responsive.css" rel="stylesheet" type="text/css" />-->
    <link href="style/core.css" rel="stylesheet" type="text/css" />
  </head>
  <body>
 
    <?php
 
 
    $_SESSION["user_id"] = $_GET["user_id"];
    $_SESSION["user_to"] = $_GET["user_to"];
 
    // Load the messages initially
    require_once __DIR__ . '/../core/FbChatMock.php';
    $chat = new FbChatMock();
    $messages = $chat->getMessages();
    ?>
 
    <div class="container" style="border: 1px solid lightgray;">
      <div class="msg-wgt-header">
 
      </div>
      <div class="msg-wgt-body">
        <table align="left">
          <?php
$pdo = new PDO('mysql:host=madaimmola01.mysql.db;dbname=madaimmola01','madaimmola01','Didilulu31');
 
    $sql = "SELECT COUNT(*) AS nb FROM chats where user_id='$cUserId' and user_to='$cUserIdto' or user_to='$cUserIdto' and user_id='$cUserId' ";
    $result = $pdo->query($sql);
    $columns = $result->fetch();
    $nb = $columns['nb'];
 
 
 
if ($nb >= "1") {
            foreach ($messages as $message) {
              $msg = htmlentities($message['message'], ENT_NOQUOTES);
              $user_name = ucfirst($message['pseudo']);
              $sent = date('F j, Y, g:i a', $message['sent_on']);
              echo <<<MSG
              <tr class="msg-row-container">
                <td>
                  <div class="msg-row">
                    <div class="avatar"></div>
                    <div class="message">
                      <span class="user-label"><a href="#" style="color: #6D84B4;">{$user_name}</a> <span class="msg-time">{$sent}</span></span><br/>{$msg}
                    </div>
                  </div>
                </td>
              </tr>
MSG;
            }
          } else {
            echo '<span style="margin-left: 25px;">Pas de Messages </span>';
          }
          ?>
        </table>
      </div>
      <div class="msg-wgt-footer">
        <textarea id="chatMsg" placeholder="Type your message. Press shift + Enter to send"></textarea>
      </div>
    </div>
 
    <script type="text/javascript" src="scripts/jquery-1.11.0.min.js"></script>
    <script type="text/javascript" src="scripts/chat.js"></script>
  </body>
</html>

et aussi au cas ou la page chat.js

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// OOP Way
fbChat = {
  bootChat: function() {
    var chatArea = $('#chatMsg'),
            that = this;
 
    // Load the messages every 5 seconds
    setInterval(this.getMessages, 1000);
 
    // Bind the keyboard event
    chatArea.bind('keydown', function(event) {
      if (event.keyCode == 13 && event.shiftKey == false) {
        var message = chatArea.val();
 
        if (message.length !== 0) {
          that.sendMessage(message);
          event.preventDefault();
        } else {
          alert('Provide a message to send!');
        }
      }
    });
  },
  sendMessage: function(message) {
    var that = this;
    $.ajax({
      url: 'ajax/add_msg.php',
      method: 'post',
      data: {msg: message},
      success: function(data) {
        $('#chatMsg').val('');
        that.getMessages();
      }
    });
  },
  getMessages: function() {
    $.ajax({
      url: 'ajax/get_messages.php',
      method: 'GET',
      success: function(data) {
        $('.msg-wgt-body').html(data);
      }
    });
  }
};
 
// Initialize the chat
//fbChat.bootChat();
 
// Procedural way
/**
 * Add a new chat message
 * 
 * @param {string} message
 */
function send_message(message) {
  $.ajax({
    url: 'ajax/add_msg.php',
    method: 'post',
    data: {msg: message},
    success: function(data) {
      $('#chatMsg').val('');
      get_messages();
    }
  });
}
 
/**
 * Get's the chat messages.
 */
function get_messages() {
  $.ajax({
    url: 'ajax/get_messages.php',
    method: 'GET',
    success: function(data) {
      $('.msg-wgt-body').html(data);
    }
  });
}
 
/**
 * Initializes the chat application
 */
function boot_chat() {
  var chatArea = $('#chatMsg');
 
  // Load the messages every 5 seconds
  setInterval(get_messages, 1000);
 
  // Bind the keyboard event
  chatArea.bind('keydown', function(event) {
    // Check if enter is pressed without pressing the shiftKey
    if (event.keyCode == 13 && event.shiftKey == false) {
      var message = chatArea.val();
      // Check if the message is not empty
      if (message.length !== 0) {
        send_message(message);
        event.preventDefault();
      } else {
        alert('Provide a message to send!');
        chatArea.val('');
      }
    }
  });
}
 
// Initialize the chat
boot_chat();