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如何用PHP和mysql创建一个ShoutBox

2009-07-31/22:44

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作为一个PHP开发人员，我有时被要求作个shoutbox 。如果同样的事情也发生在你身上，这里有一个快速指南。显然，您要为它添加您自己的CSS在上面，但这里是基本思路。
我们需要一个MySQL数据库表和三个PHP文件。
首先，我们需要一个文件保存数据库信息

--- 文件 #1:mysql.inc.php---

<?php
# Simply Shouting - ashoutboxexample
# File name:mysql.inc.php
# Description: A file to hold database info.
$host   ='localhost';
$user   ='database_user_name';
$password='database_user_password';
$name   ='database_name';
?>

创建一个有四个字段的数据表. 我们命名为shouts. 此前可能你没有这个SQL文件, 创建一个PHP文件"install.php". 这个文件用过一次之后，记得要删除它！

-- 文件 #2: install.php--

<?php
# Simply Shouting - ashoutboxexample
# File name: install.php
# Description: Creates the database table.

// include the database info file
include("mysql.inc.php");

//连接数据库

$connection= @mysql_connect($host,$user,$password) or die(mysql_error());
$db= @mysql_select_db($name,$connection) or die(mysql_error());

//如果我们已经有一个表名字叫做"shouts", 需要先删除它
$sql='DROP TABLE IF EXISTS `shouts`';
$result= @mysql_query($sql,$connection) or die(mysql_error());

// 现在确定没有相同名字的表, 创建它
$sql='CREATE TABLE `shouts` (
`id` int(11) NOT NULL auto_increment,
`timestamp` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
`shoutby` varchar(50) default NULL,
`shout` varchar(50) default NULL,
PRIMARY KEY `id` (`id`)
) TYPE=MyISAM AUTO_INCREMENT=1';
echo'Creating table: \'shouts\'....';
// 关闭连接
$result= @mysql_query($sql,$connection) or die(mysql_error());?>
<html>
<head>
<title>Simply Shouting - 安装</title>
</head>
<body>
<br />
你的安装过程已经完成. 请立即从你的服务器上删除所有安装文件. 本程序包含以下安装文件:<br />
<br />
1) install.php<br />
<br />
<br />

点击 <a href="index.php">这里</a>开始.</html>

这是主文件:

--- 文件 #3: index.php---

<?
# Simply Shouting - ashoutboxexample
# File name: index.php
# Description: Main page to display our shouts.

//包含数据库信息
include_once("mysql.inc.php");
//连接数据库
$connection= @mysql_connect($host,$user,$password) or die(mysql_error());
$db= @mysql_select_db($name,$connection) or die(mysql_error());
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><style type="text/css">

</style><body>
<div style="width:500px;height 400px; border:thin groove #519554;">
<?
// 显示最新10条留言. 首先，初始化一个计数器
$counting=0;

// we need a counter because I want to show our shouts in ASC order
// (like a chat room)

$sql=mysql_query("SELECT * FROM `shouts`");
while($data=mysql_fetch_array($sql)){
//counts every row
$counting=$counting+1;
} //end while

// if the count comes back greater than 10, then we select the last
// 10 shouts for display.

if($counting>10){
$countlessten=$counting-9;
$sql=mysql_query("SELECT * FROM `shouts` ORDER BY `shouts`.`id` ASC LIMIT $countlessten,10");
}else{
//else it doesn't matter, there's less than 10!
$sql=mysql_query("SELECT * FROM `shouts` ORDER BY `shouts`.`id` ASC LIMIT 10");
}
while($data=mysql_fetch_array($sql)){
//my timestamp field in the database is basically useless to me unless
//I parse it. The following code parses the timestamp into things I
//can use.
$timestamp=$data['timestamp'];
$postedyear=substr($timestamp,0,4);
$postedmonth=substr($timestamp,5,2);
$postedday=substr($timestamp,8,2);
$postedtime=substr($timestamp,11,5);
$newpostedtime="";
$nomilitary=substr($postedtime,0,2);

// the hour is greater than 12, so we need to switch back to 1-12 and
// add a "pm"

if($nomilitary>=13){
   $nomilitary=$nomilitary-12;
   $newpostedtime=$nomilitary;
   $newpostedtime.=":";
   $newpostedtime.=substr($postedtime,3,2) ;
   $newpostedtime.=" pm";
}
if($newpostedtime!=""){
   $postedtime=$newpostedtime;
}else{
   $postedtime.=" am";
}
//now that we have the time, let's get the shout and the shouter

$shoutby=$data['shoutby'];
$shout=$data['shout'];

echo$postedmonth."/".$postedday."/".$postedyear." at ".$postedtime." - <strong>".$shoutby." said: </strong>".$shout."<br><br>";
// looks like: 12/1/2008 at 5:02pm - Josh said: Yo Yo Yo!
}
//below is the HTML form for creating the shouts
?>
<form id="newshout" name="newshout" action="newshout.php" method="post"><input name="shoutby" type="text" id="shoutby" onClick="javascript:this.value=''" value="Enter your name here" size="24" maxlength="50" />
<br><br><input name="shout" type="text" id="shout" onClick="javascript:this.value=''" value="Click & Shout!" size="24" maxlength="50" />
<br><br><input id="submit" name="submit" type="submit" value="Shout!" /></form>
</div>
</body>
</html>

最后, 我们需要一个 PHP 文件处理表单.

-- 文件#4: newshout.php--

<?
# Simply Shouting - ashoutboxexample
# File name: newshout.php
# Description: Process the HTML form on index.phpand redirect.

//得到留言者姓名
$shoutby=$_POST['shoutby'];
if($shoutby=="Enter your name here"||$shoutby==""){
//如果没有输入名字
$shoutby="Visitor";
}
if($_POST['shout']){
// 留言信息
if($_POST['shout'] !="Click & Shout!"){
   //they didn't shout the default, so continue processing
   $shout=$_POST['shout'];
   //替换掉"<"和">"以阻止黑客
   $shout=str_replace("<"," ",$shout);
   $shout=str_replace(">"," ",$shout);
   // 包含数据信息
   include_once("dbaccess.php");

   // 连接数据库
   $connection= @mysql_connect($host,$user,$password) or die(mysql_error());
   $db= @mysql_select_db($name,$connection) or die(mysql_error());

   // 插入留言信息到数据库
   $sql="INSERT INTO `shouts`(`shoutby`,`shout`) VALUES('$shoutby','$shout')";
//关闭连接
$result= @mysql_query($sql,$connection);
}
}
?>
<html>
<head>
</head>
<body onLoad="window.open('index.php','_self')">
</body>
</html>