概述
今天刚好周六，昨天有人在群里问如何实习php的即时通讯。我也搜了搜资料，打算自己实现一遍php消息推送中的-ajax长轮询的。我觉得对php即时通讯的介绍写得比较好的是：
可以参考一下，其他我就不多说了，参考链接，优于用于演示，就没有操作数据库中的东西了。
我的代码
入口代码 index.html
<!DOCTYPE HTML><html><head> <title>反ajax推送</title> <style> .send{color:#555;text-align: left;} .require{color:blue;text-align: right;} .content_box{text-align: center;margin: 20px; border: 1px solid #ddd;padding: 20px;} </style> <script src="http://code.jquery.com/jquery-1.11.2.min.js"></script></head><body> <div class="content_box" id="content_box_title" style="border: none;">消息框</div> <div class="content_box" id="content_box"> </div> <div style="width: 450px;margin: 0 auto;"> <select id="username" style="font-size: 20px;"> <option value="1" selected="selected">1</option> <option value="2">2</option> </select> <input type="text" style="font-size: 20px;" value="" id="send_text"> <button id="btn_send" style="font-size: 20px;">发送</button> <button id="btn_link" style="font-size: 20px">连接</button> </div> <div class="error_tip" id="error_tip" style="color: red;"> </div> <script> $(function(){ //发送消息 $('#btn_send').click(function(){ var send_text = $('#send_text').val(); if(send_text.length <= 0){ $('#error_tip').html('不能输入空值'); }else{ send(send_text); } }); //按回车键发送消息 $('#send_text').on('keyup',function(e){ if(e.keyCode == 13){ $('#btn_send').trigger('click'); } }); //建立通讯链接 $('#btn_link').click(function(){ connect(); var _this = $(this); _this.attr('disabled',true); _this.html('已连接'); }); }); //建立通讯连接函数 function connect(){ $('#content_box_title').html($('#username').val()+'的消息窗口'); $.ajax({ data:{'user':$('#username').val()}, url:'ajaxPush.php', type:'get', timeout:0, dataType:'json', success:function(data){ $('#content_box').append('<div class="require">'+data.msg+'</div>'); connect(); } }); } //发送消息函数 function send(massege){ var user =$('#username').val(); $.getJSON('write.php',{'msg':massege,'user':user},function(data){ if(data.sf){ $('#content_box').append('<div class="send">'+massege+'</div>'); $('#send_text').val(''); }else{ $('#error_tip').html('输入保存错误！'); } }); } </script></body></html> ajax处理输入 write.php
<?php/** * Created by TXM. * Time: 2015/4/18 13:13 * function: */$filename = dirname(__FILE__).'/data.txt';$isread_file = dirname(__FILE__).'/isread.txt';$user = dirname(__FILE__).'/user.txt';//写入消息，消息未读，谁发送的消息file_put_contents($filename,$_GET['msg']);file_put_contents($isread_file,'0');file_put_contents($user,$_GET['user']);echo json_encode(array('sf'=>true)); 长轮询推送 ajaxPush.php
<?php/** * Created by TXM. * Time: 2015/4/18 13:12 * function: */$filename = dirname(__FILE__).'/data.txt';$isread_file = dirname(__FILE__).'/isread.txt';$userfile = dirname(__FILE__).'/user.txt';$get_user = $_GET['user'] == '1'?'2':'1';$msg='';while(1){ $msg = file_get_contents($filename); $isread = file_get_contents($isread_file); $user = file_get_contents($userfile); //是对方发送的消息，设置消息已读，退出循环。 if($isread == '0' && $get_user == $user){ file_put_contents($isread_file,'1'); break; } sleep(1);}echo json_encode(array('msg'=>$msg)); 效果
源码下载地址
http://pan.baidu.com/s/1pJ5elpp
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