如何用PHP和mysql创建一个ShoutBox

日期:2008-06-26  作者:喜腾小二  来源:PHPChina


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 - a shoutbox example
# 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 - a shoutbox example
# 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 DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1'
;
echo
'Creating table: 'shouts'....';
// 关闭连接
$result = @mysql_query($sql,$connection) or die(mysql_error()); ?>


Simply Shouting - 安装



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 php">这里开始.

 这是主文件:

--- 文件 #3: index.php ---

# Simply Shouting - a shoutbox example
# 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 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 ." - " . $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 - a shoutbox example
# File name: newshout.php
# Description: Process the HTML form on index.php and 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);
  }
}
?>



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