php+html implements chat room

1. The easiest way - keep refreshing the page

Database creation

create table chat (
  chattime datetime,
  nick char(10),
  words char(150)
);

login.php

  <title>用户登录</title>
  <meta charset="utf-8">

请输入您的昵称<br>

//点击登录后跳转到main.php，并将输入的数据用post的方式发送过去

main.php

<?php session_start();
  $_SESSION[&#39;nick&#39;] = $_POST[&#39;nick&#39;]; //获取login.php发送过来的数据，也就是用户昵称，并将它保存在session中用于对用户进行跟踪
?>

  <frameset rows="80%, 20%">
  <frame src="cdisplay.php" name="chatdisplay">   // 聊天信息展示区
  <frame src="speak.php" name="speak">    //发言区
  </frameset>

speak.php

  <title>发言</title>
  <meta charset="utf-8">


<?php session_start();
   if ($_POST[&#39;words&#39;]) {
   $conn = mysql_connect("127.0.0.1","root","******");  //连接数据库
   mysql_select_db("yuema", $conn);
   $time = date(y).date(m).date(d).date(h).date(i).date(s);  //当前时间
   $nick = $_SESSION[&#39;nick&#39;];
   $words = $_POST[&#39;words&#39;];
   $str = "insert into chat(chattime, nick, words) values(&#39;$time&#39;, &#39;$nick&#39;, &#39;$words&#39;);"; 
   mysql_query($str, $conn);  //将用户名，时间和发言内容进行插入
   mysql_close($conn);
}
?>

cdisplay.php

  <title>显示用户发言</title>
  <meta http-equiv="refresh" c>

<?php $conn = mysql_connect("127.0.0.1", "root", "7940175");
  mysql_select_db("yuema", $conn);
  $str = "select * from chat order by chattime;";
  $result = mysql_query($str, $conn);
  $rows = mysql_num_rows($result);
  mysql_data_seek($result, $rows-15); //取最近插入的15条数据
  if ($rows<15)
    $l = $rows;
  else  
    $l = 15;
  for ($i = 1; $i <= $l; $i++) {    //输出这15条数据
    list($chattime, $nick, $words) = mysql_fetch_row($result);
    echo $chattime;
    echo " ".$nick." ";
    echo $words;
    echo "<br>";
  }
?>

result display

2. Ajax acquisition, without refreshing the page

The above introduces the implementation of chat room with php+html, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.