htdoc/htdocs/button/saveChat.php

<?php
session_start();
include "connect.php";

$id = $_SESSION['id'];
$name = $_SESSION['name'];
$createtime = date("Y-m-d H:i:s");
$msg = $_POST["msg"];

$sql = "INSERT INTO chat_record (user_id, user_name, msg, create_time) VALUES ('$id','$name','$msg','$createtime')";
$result = mysql_query($sql);