如何用PHP和mysql创建一个ShoutBox

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---

 
# 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--

 
# 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;
echoCreating table: shouts....;
// 关闭连接
$result= @mysql_query($sql,$connection) or die(mysql_error());?>

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:



1) install.php






点击 这里开始.
 

 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());
?>

// 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 doesnt matter, theres 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, lets get the shout and the shouter

 $shoutby=$data[shoutby];
 $shout=$data[shout];
 
  echo$postedmonth."/".$postedday."/".$postedyear." at ".$postedtime." - ".$shoutby." said: ".$shout."

";
 // looks like: 12/1/2008 at 5:02pm - Josh said: Yo Yo Yo!
}
//below is the HTML form for creating the shouts
?>

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 didnt shout the default, so continue processing
   $shout=$_POST[shout];
   //替换掉""以阻止黑客
   $shout=str_replace("   $shout=str_replace(">"," ",$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);
  }
}
?>