📄 online.php

📁 这是使用ＰＨＰ编程的虚拟社区ＭySQL的简易版

💻 PHP

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<?
  include "config.inc.php";

function ReadOnline() {
  global $ONLINE_TABLE,$CHECK_TIME;
  global $id,$total;

  $new_time=time();

  $SQL="DELETE FROM $ONLINE_TABLE WHERE (($new_time-old_time)>$CHECK_TIME)";

  mysql_query($SQL) or die(mysql_error());

  $SQL="UPDATE $ONLINE_TABLE SET old_time='$new_time' WHERE id='$id'";
  mysql_query($SQL) or die(mysql_error());

  $SQL="SELECT Count(*) AS total FROM $ONLINE_TABLE";

  $result=mysql_query($SQL) or die(mysql_error());
  $row=mysql_fetch_Array($result);

  $total=$row[total];
}


  ReadOnline();

?>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta http-equiv="Refresh" content="<? echo $REFRESH_TIME."; url=$PHP_SELF?id=$id"; ?>">
<STYLE type="text/css">
<!--
.wdGray{ font-size:9pt; line-height:11pt; font-family:宋体; color: #666666 }
//-->
</STYLE>
</head>
<BODY leftmargin=0 topmargin=0>
<CENTER>
  <IMG name="logo" SRC="images/lotus.gif" border="0">
<DIV id="Layer1" class=wdGray style="position:absolute; width:140px; height:30px; z-index:1; left: 10px; top: 70px">在线: <FONT color=red><? echo $total; ?></FONT> 人</div>
</CENTER>
</BODY>
</HTML>

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