php网站怎么写一个聊天
网页聊天室我们可以使用多种方式实现，比如websocket，或是使用第三方的聊天服务，下面介绍一种最简单的方式，不断刷新页面获取信息。
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1、数据库建立
create table chat ( chattime datetime, nick char(10), words char(150));
login.php
<html><head> <title>用户登录</title> <meta charset="utf-8"></head><body>请输入您的昵称<br><form action="main.php" method="post" target="_self"> //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 <input type="text" name="nick" cols="20"> <input type="submit" value="登录"></body></html>
main.php
<?php session_start(); $_session['nick'] = $_post['nick']; //获取login.php发送过来的数据，也就是用户昵称，并将它保存在session中用于对用户进行跟踪?><html> <frameset rows="80%, 20%"> <frame src="cdisplay.php" name="chatdisplay"/> // 聊天信息展示区 <frame src="speak.php" name="speak"/> //发言区 </frameset></html>
speak.php
<html><head> <title>发言</title> <meta charset="utf-8"></head><body><?php session_start(); //如果设置北京时间，需要加上 date_default_timezone_set('prc'); if ($_post['words']) { $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['nick']; $words = $_post['words']; $str = "insert into chat(chattime, nick, words) values('$time', '$nick', '$words');"; mysql_query($str, $conn); //将用户名，时间和发言内容进行插入 mysql_close($conn);}?> <form action="speak.php" method="post" target="_self"> <input type="text" name="words" cols="20"> <input type="submit" value="发言"></form></body></html>
cdisplay.php
<html><head> <title>显示用户发言</title> <meta http-equiv="refresh" content="5;url=cdisplay.php"> //设置每隔5秒钟刷新一次</head><body><?php $conn = mysql_connect("127.0.0.1", "root", "******"); 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>"; }?></body></html>
结果展示
2. ajax获取，不刷新页面
login.php
<html><head> <title>用户登录</title> <meta charset="utf-8"></head><body>请输入您的昵称<br><form action="main.php" method="post" target="_self"> //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 <input type="text" name="nick" cols="20"> <input type="submit" value="登录"></body></html>
main.php
<?php session_start(); $_session['nick'] = $_post['nick']; //获取login.php发送过来的数据，也就是用户昵称，并将它保存在session中用于对用户进行跟踪?><html> <frameset rows="80%, 20%"> <frame src="cdisplay.php" name="chatdisplay"/> // 聊天信息展示区 <frame src="speak.php" name="speak"/> //发言区 </frameset></html>
speak.php
<html><head> <title>发言</title> <meta charset="utf-8"></head><body><?php session_start(); //如果设置北京时间，需要加上 date_default_timezone_set('prc'); if ($_post['words']) { $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['nick']; $words = $_post['words']; $str = "insert into chat(chattime, nick, words) values('$time', '$nick', '$words');"; mysql_query($str, $conn); //将用户名，时间和发言内容进行插入 mysql_close($conn);}?> <form action="speak.php" method="post" target="_self"> <input type="text" name="words" cols="20"> <input type="submit" value="发言"></form></body></html>
cdisplay.php
<html><head> <meta charset="utf-8"> <title>显示用户发言</title> <script type="text/javascript" src="jquery.js"></script> //jquery库，jquery.js可以在网上下载 <script type="text/javascript"> setinterval('show()', 3000); // 设置自动刷新时间 3000毫秒也就是3秒钟 function show() { $.ajax({ url:'server_get.php', //请求发送到server_get.php进行处理 type:'post', datatype:'html', error:function() { alert('请求失败，请稍后再试'); }, success:function(msg) { $('p').html(msg); //设置body中p标签的内容 } }); } </script></head><body><p></p></body></html>
server_get.php
<?php $conn = mysql_connect("127.0.0.1", "root", "******"); 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, $rows-15); if ($rows < 15) $l = $rows; else $l = 15; $string = ""; for ($i = 1; $i <= $l; $i++) { list($chattime, $nick, $words) = mysql_fetch_row($result); $string.=$chattime; $string.=" "; $string.=$nick; $string.=" "; $string.=$words; $string.="<br>"; } echo $string; ?>
以上就是php网站怎么写一个聊天的详细内容。