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本篇文章给大家分享的是有关使用php+ajax怎么实现一个实时聊天室功能，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
php是一个嵌套的缩写名称，是英文超级文本预处理语言，它的语法混合了C、Java、Perl以及php自创新的语法，主要用来做网站开发，许多小型网站都用php开发，因为php是开源的，从而使得php经久不衰。
关键代码：
<?php
header('content-type:text/html;charset=utf-8');
//显示在线用户
$disonline = 1;
//新登陆时显示最近内容的条数(默认为30条)
$leastnum = 30;
//默认的房间名(默认是每天换一个文件)，如果去掉d，则是每月换一个文件
$room = date("Y-m-d");
//房间保存路径,必须仿quot;/"结尾,可以丿quot;../"，等
$roomdir = "rooms/";
//编码方式
$charset = "UTF-8";
//客户端最大显示内容条数(建议不要太大)
$maxdisplay = 300;
//语言包
$lang = array(
//聊天室描述
"description"=>"聊天室.",
//聊天室标题
"title"=>"Welcome...!",
//第一个到聊天室的欢迎
"firstone"=>"<span style='font-size:16px;color:blue;'>Welcome...!</span>",
//当信息有禁止内容时显示
"ban" => array('法轮功', '共产党', '李洪志', 'fuck', '叼', '你妈的', '他妈的'),
//关键字
"keywords"=>"Welcome...!",
//发言提示
"hereyourwords" => "在这里发言!"
);
$touchs = 10;
$title = $lang["title"];
$earlier = 10;
$description = $lang["description"];
$origroom = $room;
$least = ($_GET["dis"])?intval($_GET["dis"]):$leastnum;
if ($_GET["room"]) $room = $_GET["room"];
$room = checkfilename($room);
if (!$room) $room = $origroom;
$filename = $roomdir.$room.".dat.php";
$datafile = $roomdir.$room.".php";
if (!is_dir($roomdir)) {
@mkdir($roomdir, 0777) or exit('no this dir.');
}
if(file_exists($filename)){
if ((int)filemtime($filename) + 1800 < time()) {
unlink($filename);
}
}
if (!file_exists($filename)) @file_put_contents($filename,'<?php die();?>'."\n".time()."|".$lang["firstone"]."\n");
if (!file_exists($datafile)) @file_put_contents($datafile,'<?php die();?>'."\n");
$action = $_GET["action"];
if (!function_exists("file_get_contents"))
{
function file_get_contents($path)
{
if (!file_exists($path)) return false;
$fp=@fopen($path,"r");
$all=fread($fp,filesize($path));
fclose($fp);
return $all;
}
}
if (!function_exists("file_put_contents"))
{
function file_put_contents($path,$val)
{
$fp=@fopen($path,"w");
fputs($fp,$val);
fclose($fp);
return true;
}
}
function checkfilename($file)
{
if (!$file) return "";
$file = trim($file);
$a = substr($file,-1);
$file = eregi_replace("^[.\\\/]*","",$file);
$file = eregi_replace("[.\\\/]*$","",$file);
$arr = array("../","./","/","\\","..\\",".\\");
$file = str_replace($arr,"",$file);
return $file;
}
function get_ip()
{
global $_SERVER;
if ($_SERVER)
{
if ( $_SERVER[HTTP_X_FORWARDED_FOR] )
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if ( $_SERVER["HTTP_CLIENT_ip"] )
$realip = $_SERVER["HTTP_CLIENT_ip"];
else
$realip = $_SERVER["REMOTE_ADDR"];
}
else
{
if ( getenv( 'HTTP_X_FORWARDED_FOR' ) )
$realip = getenv( 'HTTP_X_FORWARDED_FOR' );
else if ( getenv( 'HTTP_CLIENT_ip' ) )
$realip = getenv( 'HTTP_CLIENT_ip' );
else
$realip = getenv( 'REMOTE_ADDR' );
}
return $realip;
}
function array2json($arr)
{
if (function_exists('json_encode')) return json_encode($arr);
$keys = array_keys($arr);
$isarr = true;
$json = "";
for($i=0;$i<count($keys);$i++)
{
if ($keys[$i] !== $i)
{
$isarr = false;
break;
}
}
$json = $space;
$json.= ($isarr)?"[":"{";
for($i=0;$i<count($keys);$i++)
{
if ($i!=0) $json.= ",";
$item = $arr[$keys[$i]];
$json.=($isarr)?"":$keys[$i].':';
if (is_array($item))
$json.=array2json($item);
else if (is_string($item))
$json.='"'.str_replace(array("\r","\n"),"",$item).'"';
else $json.=$item;
}
$json.= ($isarr)?"]":"}";
return $json;
}
if ($action == "write")
{
$color = $_GET['color'];
if (!eregi("[0-9a-fA-F]{6}",$color) || $color == "#000000") $color = "";
$color = "#".$color;
$size = intval($_GET["size"]);
$arr = @file("php://input");
$name = str_replace(array("\n","\r"),"",$arr[0]);
$ip = get_ip();
if ($disonline)
{
$onlines = @file_get_contents($datafile);
$s1 = "|{$name}|{$ip}|";
if (strpos($onlines,$s1) === false)
{
if (strpos($onlines,"|".$name."|") === false)
{
$fp = @fopen($datafile,"a+");
if ($fp)
{
if (@flock($fp, LOCK_EX))
{
@fputs($fp,time()."|".time().$s1."\n");
@flock($fp, LOCK_UN);
}
@fclose($fp);
}
}
else
{
echo "NAME";
die();
}
}
}
$s = "";
$style = "";
$font = $_GET["font"];
if ($font == "songti") $font = "宋体";
else if ($font == "heiti") $font = "黑体";
else if ($font == "kaiti") $font = "楷体_GB2312";
else $font = "";
$style .= (!$font)?"":"font-family:".$font.";";
$style .= (!$_GET["bold"])?"":"font-weight:bold;";
$style .= (!$color || $color == "#")?"":"color:{$color};";
$style .= (!$size || $size == "16")?"":"font-size:{$size}px;";
$t = time();
for($i = 1;$i<count($arr);$i++)
{
$content = $arr[$i];
$content = str_replace(array("\n","\r"),"",$content);
if ($content == "") continue;
$content = preg_replace("!<img\s+(.*?)/>!i", "[img $1/]", $content);
$content = str_replace(array('<', '>'), array('<', '>'), $content);
$content = preg_replace("!\[img (.*?)/\]!i", "<img $1/>", $content);
$content = str_replace($lang['ban'], '', $content);
$content = ($style)?"<span style='{$style}'>{$content}</span>":$content;
$ubbarray = array('[:ani_wink:]',
'[:big_eyes:]',
'[:cool:]',
'[:cry:]',
'[:eye_roll:]',
'[:grin:]',
'[:happy:]',
'[:not_impressed:]',
'[:smile:]',
'[:smile_eyes:]',
'[:stickout:]',
'[:straight:]',
'[:surprised:]',
'[:unhappy:]',
'[:wink:]');
$content = str_replace($ubbarray,
array('<img src="smilies/ani_wink.gif" />',
'<img src="smilies/big_eyes.gif" />',
'<img src="smilies/cool.gif" />',
'<img src="smilies/cry.gif" />',
'<img src="smilies/eye_roll.gif" />',
'<img src="smilies/grin.gif" />',
'<img src="smilies/happy.gif" />',
'<img src="smilies/not_impressed.gif" />',
'<img src="smilies/smile.gif" />',
'<img src="smilies/smile_eyes.gif" />',
'<img src="smilies/stickout.gif" />',
'<img src="smilies/straight.gif" />',
'<img src="smilies/surprised.gif" />',
'<img src="smilies/unhappy.gif" />',
'<img src="smilies/wink.gif" />'),
$content);
$s.= $t."|".$name.":".$content."\n";
}
if (!$name) die("No Name!!");
if (!$s) die("No Content!!");
$fp = @fopen($filename,"a+");
if (!$fp) die("repeat");
if (@flock($fp, LOCK_EX))
{
@fputs($fp,$s);
@flock($fp, LOCK_UN);
}
else die("repeat");
@fclose($fp);
echo "OK";
}
else if (trim($action) == "read")
{
if (get_magic_quotes_runtime()) {
set_magic_quotes_runtime(0);
}
$first = $_GET["first"];
$lastmod = intval($_GET["lastmod"]);
$alastmod = @filemtime($filename);
$name = file_get_contents("php://input");
$name = str_replace("\n","",$name);
$ip = get_ip();
$json = array();
$json["lastmod"] = $alastmod;
$item = array();
$newonline = array();
$offline = array();
$lines = @file($filename);
if ($alastmod > $lastmod && !$first)
{
foreach($lines as $l)
{
$item2 = array();
$l = str_replace(array("\n","\r"),"",$l);
if (strpos($l,"|") === false) continue;
$arr = explode("|",$l);
$t = intval($arr[0]);
if ($t > $lastmod)
{
$item2["time"] = date("H:i:s",$t);
$item2["word"] = stripslashes($arr[1]);
$item[] = $item2;
}
}
}
else if ($first)
{
$item = array();
$total = count($lines);
for($i=$total-1;$i>=$total-$least;$i--)
{
if ($i<=0) break;
$item2 = array();
$l = str_replace(array("\n","\r"),"",$lines[$i]);
if (strpos($l,"|") === false) continue;
$arr = explode("|",$l);
$t = intval($arr[0]);
$item2["time"] = (date("m-d",time()) == date("m-d",$t))?date("H:i:s",$t):date("m-d H:i",$t);
$item2["word"] = stripslashes($arr[1]);
$item[] = $item2;
}
$item = array_reverse($item);
}
$s = "";
$nt = time();
$onlines = array();
if($disonline)
{
$users = @file($datafile);
foreach($users as $l)
{
$l = str_replace(array("\r","\n"),"",$l);
if (strpos($l,"|") === false)
{
$s.=$l."\n";
continue;
}
$arr = explode("|",$l);
if ($nt - intval($arr[1]) < $touchs*2+1)
{
if (trim($name) == trim($arr[2]))
{
$s.= $arr[0]."|".time()."|".$name."|".get_ip()."|\n";
}
else $s.=$l."\n";
$onlines [] = $arr[2];
}
}
@file_put_contents($datafile,$s);
$json["onlines"] = $onlines;
}
$json["lines"] = $item;
echo array2json($json);
if (!get_magic_quotes_runtime()) {
set_magic_quotes_runtime(1);
}
}
else
{
?>以上就是使用php+ajax怎么实现一个实时聊天室功能，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。
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