ajax+php 实现即时聊天

//**************** 参数 设置****************
//显示 在线 用户
$disonline = true;
//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,必须以/结尾
$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
$lang = array(
//聊天室描述
"description"=>" 欢迎 来到迷你AJAX聊天室。Email: dom [email protected]", 
//聊天室标题
"title"=>"欢迎进入迷你聊天 系统 ", 
//第一个到聊天室的欢迎
"firstone"=>"系统广播：", 
//当信息有禁止内容时显示
"ban"=>"请使用文明用语！禁止发布非法信息！",
//关键字
"keywords"=>"聊天室",
//发言 提示
"hereyourwords" => "在这里发言!"
);

header("content-type:text/ html ; charset=utf-8");

$get_past_sec = 3; //如果发现丢话，可以适当调大这个值
$touchs = 10; //检查在线人数的时间间隔
$title = $lang["title"];
$earlier = 10;
$description = $lang["description"];
$origroom = $room;
$least = ($_ GET ["dis"])?intval($_GET["dis"]):$leastnum;
$touchme = $_POST['touchme'];
if (!is_dir($roomdir)) @mkdir($roomdir) or die("error when creating folder $roomdir");
$room = $_GET['room'];
if (!$room) $room = $_POST["room"];
$room = checkfilename($room);
if (!$room) $room = $origroom;
$filename = $roomdir.$room.".dat.php";
$datafile = $roomdir.$room.".php";
if (!file_exists($filename)) @file_put_contents($filename,''."\n".time()."|".$lang["firstone"]."\n");
if (!file_exists($datafile)) @file_put_contents($datafile,''."\n");
$action = $_POST["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)
{
$keys = array_keys($arr);
$isarr = true;
$json = "";
for($i=0;$i
{
if ($keys[$i] !== $i)
{
$isarr = false;
break;
}
}
$json = $space;
$json.= ($isarr)?"[":"{";
for($i=0;$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;
}

function keeponline()
{
global $disonline,$datafile;
if (!$disonline) return;
$name = $_POST['name'];
$ip = get_ip();
$onlines = @file_get_contents($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();
}
}
}

if ($action == "write")
{
$color = $_POST["color"];
if (!eregi("[0-9a-fA-F]{6}",$color) || $color == "#000000") $color = "";
$color = "#".$color;
$size = intval($_POST["size"]);
$name = str_replace(array("\n","\r"),"",$_POST['name']);
if (!$name) die("No Name!!");
$ip = get_ip();
keeponline();

$s = "";
$style = "";
$font = $_POST["font"];
if ($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.";";
$style .= (!$_POST["bold"])?"":"font-weight:bold;";
$style .= (!$color || $color == "#")?"":"color:{$color};";
$style .= (!$size || $size == "16")?"":"font-size:{$size}px;";
$t = time();
$arr = explode("\n",$_POST['content']);
for($i = 0;$i
{
$content = $arr[$i];
$content = trim($content);
$content = str_replace(array("\n","\r"),"",$content);
if (!$content) continue;
$content = htmlspecialchars($content);
$content = preg_replace("~\[img\](http:\/\/[a-zA-Z0-9\.-_\+%\?]*)\[\/img\]~i", "", $content);
$content = ($style)?"{$content}":$content;
$s.= $t."|".$name.":".$content."\n";
}

if (!$s) die("No Content!!");
$fp = @fopen($filename,"a+");
if (!$fp) die("repeat");
$re_time = 0;
while(!@flock($fp, LOCK_EX))
{
sleep(1);
$re_time++;
if ($re_time >=4) break;
}
if ($re_time <4)
{
@fputs($fp,$s);
@flock($fp, LOCK_UN);
}
else die("repeat");
@fclose($fp);
echo "OK";
}
else if ($action == "read")
{
$first = $_POST["first"];
$lastmod = intval($_POST["lastmod"]) - $get_past_sec; //得到两秒以内的所有发言，
$alastmod = @filemtime($filename);
$name = $_POST['name'];
$name = str_replace("\n","",$name);
$ip = get_ip();
$json = array();
$json["lastmod"] = time();
$item = array();
$newonline = array();
$offline = array();

$fp = @fopen($filename,'r');
flock($fp,LOCK_EX);
$s = fread($fp,filesize($filename));
flock($fp,LOCK_UN);
fclose($fp);
$lines = explode("\n",$s);

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);
$item2["word"] = addslashes($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);
$item2["word"] = addslashes($arr[1]);
$item[] = $item2;
}
$item = array_reverse($item);
}

$s = "";
$nt = time();
$onlines = array();
if($disonline && $touchme)
{
$users = @file($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]) < $touchs*3)
{
if (trim($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);
}
else if ($action == "keep" )
{
keeponline();
echo "keep ok";
}
else if ($action == "quit")
{
$name = $_POST['name'];
if($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 (trim($name) == trim($arr[2])) continue;
else $s.=$l."\n";
}
@file_put_contents($datafile,$s);
echo "OK";
}
die();
}
else
{
?>






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') this.value='';" </span> <br style="margin:0px; padding:0px; font-family:Verdana,Arial,Helvetica,sans-serif; font-size:14px; color:rgb(101,101,101); line-height:17px; text-indent:28px"> <span style="color:rgb(34,34,34); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:14px; line-height:25px; text-indent:28px">οnkeydοwn="return check_send(event);" ><?php echo $lang["hereyourwords"];?>

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}
?>