[php征文]PHP 实现RSS 完整实例

 

PHP 实现RSS 完整实例这是我曾经写的一篇学习记录。

该实例包括3个页面:

rss.php

mysql.class.php

rss.class.php

 

 

第一个页面:rss.php

 

<?php
/*
* Created on 2010-11-5
*
* ETweb
*
*/

include_once('libs/rss.class.php');
include_once('libs/mysql.class.php');

#[数据库配置信息]

$db_config = array(
'dbtype'=>'mysql',
'dbhost'=>'localhost',
'dbuser'=>'root',
'dbpass'=>'',
'dbname'=>'etweb',
'def'=>'hzm_',//表前缀

'charset'=>'GBK',
'timezone'=>'PRC',
'coding'=>'deb1ba4390d2cfb1e973fe61ceef94a3', //生成cookie加密

'version'=>'1.1',//版本号

);
$db = new mysql($db_config['dbhost'], $db_config['dbuser'], $db_config['dbpass'], $db_config['dbname'], ALL_PS, $db_config['charset']);


$Rss_newnum=20;
$Rss_listnum=20;
$Rss_updatetime=10;

$title ="实现RSS订阅";
$link = "";
$db_bbsname ="天空从何开始";
$db_bbsurl = "rss.php";

$channel = array(
'title' => $title,
'link' => $link,
'description' => "Latest $Rss_newnum replies of $title",
'copyright' => "Copyright(C) $db_bbsname",
'generator' => "ETweb by 天空从何开始",
'lastBuildDate' => date('r'),
);

$image = array(
'url' => "templates/default/images/rss.png",
'title' => 'ET website',
'link' => $db_bbsurl,
'description' => $db_bbsname,
);

$oRSS = new Rss(array('xml'=>"1.0",'rss'=>"2.0",'encoding'=>"gb2312"));
$oRSS->channel($channel);

$oRSS->image($image);

$sql = "select b.id,b.classid,b.title,b.author,b.date_time,b.description,class.id,class.name from hzm_news_base b left join hzm_news_class class on b.classid=class.id order by b.id desc limit $Rss_listnum ";
//联合查询 item中呈现的数据，这里是查询的一个新闻基表（hzm_news_base）及其分类（hzm_news_class）


$result = $db->query($sql);
while($row = $db->fetch_array($result)){
$item = array(

"title"=>$row[title],
"description"=>$row[description],
"link"=>"article.php?id=$row[id]",
"author"=>$row[author],
"category"=>$row[name],
"pubdate"=>date("Y-m-d",$row[date_time])

);
$oRSS->item($item);
}



$all = $oRSS->rssHeader;
$all .= $oRSS->rssChannel;
$all .= $oRSS->rssImage;
$all .= $oRSS->rssItem;
$all .= "";

header("Content-type: application/xml");
echo $all;exit;
?>

 

 

第2个页面：rss.class.php

//-----------------------以下为rss.class.php 取自phpwind--------------------------------//
<?php


/**
* Rss
*
* @package Rss
*/
class Rss {

public $rssHeader;
public $rssChannel;
public $rssImage;
public $rssItem;

function Rss($Rss = array('xml'=>"1.0",'rss'=>"2.0",'encoding'=>"gb2312")) {

$this->rssHeader = "\n";
$this->rssHeader .= "\n";
}

function channel($channel) {

$this->rssChannel = "\n";
foreach ($channel as $key => $value) {
$this->rssChannel .= " <$key> . $value . "]]>\n";
}
}

function image($image) {

$this->rssImage = " \n";
foreach ($image as $key => $value) {
$this->rssImage .= " <$key> . $value . "]]>\n";
}
$this->rssImage .= " \n";
}

function item($item) {

$this->rssItem .= "\n";
foreach ($item as $key => $value) {
$this->rssItem .= " <$key> . $value . "]]>\n";
}
$this->rssItem .= "\n";
}
/**
* 写文件
*
* @param string $fileName 文件绝对路径
* @param string $data 数据
* @param string $method 读写模式
* @param bool $ifLock 是否锁文件
* @param bool $ifCheckPath 是否检查文件名中的“..”
* @param bool $ifChmod 是否将文件属性改为可读写
*/
function writeover($fileName, $data, $method = 'rb+', $ifLock = true, $ifCheckPath = true, $ifChmod = true) {
//$fileName = Pcv($fileName, $ifCheckPath);
touch($fileName);
$handle = fopen($fileName, $method);
$ifLock && flock($handle, LOCK_EX);
fwrite($handle, $data);
$method == 'rb+' && ftruncate($handle, strlen($data));
fclose($handle);
$ifChmod && @chmod($fileName, 0777);
}

function generate($rss_path) {

$all = $this->rssHeader;
$all .= $this->rssChannel;
$all .= $this->rssImage;
$all .= $this->rssItem;
$all .= "";
writeover($rss_path, $all);
}
}
?>

 

第3个页面mysql.class.php:

//-------------------------以下为mysql.class.php 出自phpyun-------------------------------//

<?php
/*
* Created on 2010
* Link for [e-mail]
* This PHPYun.Rencai System Powered by PHPYun.com
*/

class mysql {
private $db_host; //数据库主机

private $db_user; //数据库用户名

private $db_pwd; //数据库用户名密码

private $db_database; //数据库名

private $conn; //数据库连接标识;

private $result; //执行query命令的结果资源标识

private $sql; //sql执行语句

private $row; //返回的条目数

private $coding; //数据库编码，GBK,UTF8,gb2312

private $bulletin = true; //是否开启错误记录

private $show_error = true; //测试阶段，显示所有错误,具有安全隐患,默认关闭

private $is_error = false; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的


/*构造函数*/
public function __construct($db_host, $db_user, $db_pwd, $db_database, $conn, $coding) {
$this->db_host = $db_host;
$this->db_user = $db_user;
$this->db_pwd = $db_pwd;
$this->db_database = $db_database;
$this->conn = $conn;
$this->coding = $coding;
$this->connect();
}

/*数据库连接*/
public function connect() {
if ($this->conn == "pconn") {
//永久链接

$this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);
} else {
//即使链接

$this->conn = mysql_connect($this->db_host, $this->db_user, $this->db_pwd);
}

if (!mysql_select_db($this->db_database, $this->conn)) {
if ($this->show_error) {
$this->show_error("数据库不可用：", $this->db_database);
}
}
mysql_query("SET NAMES $this->coding");
}

/*数据库执行语句，可执行查询添加修改删除等任何sql语句*/
public function query($sql) {
if ($sql == "") {
$this->show_error("SQL语句错误：", "SQL查询语句为空");
}
$this->sql = $sql;

$result = mysql_query($this->sql, $this->conn);

if (!$result) {
//调试中使用，sql语句出错时会自动打印出来

if ($this->show_error) {
$this->show_error("错误SQL语句：", $this->sql);
}
} else {
$this->result = $result;
}
return $this->result;
}

/*创建添加新的数据库*/
public function create_database($database_name) {
$database = $database_name;
$sqlDatabase = 'create database ' . $database;
$this->query($sqlDatabase);
}

/*查询服务器所有数据库*/
//将系统数据库与用户数据库分开，更直观的显示？

public function show_databases() {
$this->query("show databases");
echo "现有数据库：" . $amount = $this->db_num_rows($rs);
echo "";
$i = 1;
while ($row = $this->fetch_array($rs)) {
echo "$i $row[Database]";
echo "";
$i++;
}
}

//以数组形式返回主机中所有数据库名

public function databases() {
$rsPtr = mysql_list_dbs($this->conn);
$i = 0;
$cnt = mysql_num_rows($rsPtr);
while ($i < $cnt) {
$rs[] = mysql_db_name($rsPtr, $i);
$i++;
}
return $rs;
}

/*查询数据库下所有的表*/
public function show_tables($database_name) {
$this->query("show tables");
echo "现有数据库：" . $amount = $this->db_num_rows($rs);
echo "";
$i = 1;
while ($row = $this->fetch_array($rs)) {
$columnName = "Tables_in_" . $database_name;
echo "$i $row[$columnName]";
echo "";
$i++;
}
}

/*
mysql_fetch_row() array $row[0],$row[1],$row[2]
mysql_fetch_array() array $row[0] 或 $row[id]
mysql_fetch_assoc() array 用$row->content 字段大小写敏感
mysql_fetch_object() object 用$row[id],$row[content] 字段大小写敏感
*/

/*取得结果数据*/
public function mysql_result_li() {
return mysql_result($str);
}

/*取得记录集,获取数组-索引和关联,使用$row['content'] */
public function fetch_array() {
return mysql_fetch_array($this->result);
}

//获取关联数组,使用$row['字段名']

public function fetch_assoc() {
return mysql_fetch_assoc($this->result);
}

//获取数字索引数组,使用$row[0],$row[1],$row[2]

public function fetch_row() {
return mysql_fetch_row($this->result);
}

//获取对象数组,使用$row->content

public function fetch_Object() {
return mysql_fetch_object($this->result);
}

/*取得上一步 INSERT 操作产生的 ID*/
public function insert_id() {
return mysql_insert_id();
}

//指向确定的一条数据记录

public function db_data_seek($id) {
if ($id > 0) {
$id = $id -1;
}
if (!@ mysql_data_seek($this->result, $id)) {
$this->show_error("SQL语句有误：", "指定的数据为空");
}
return $this->result;
}

// 根据select查询结果计算结果集条数

public function db_num_rows() {
if ($this->result == null) {
if ($this->show_error) {
$this->show_error("SQL语句错误", "暂时为空，没有任何内容！");
}
} else {
return mysql_num_rows($this->result);
}
}

// 根据insert,update,delete执行结果取得影响行数

public function db_affected_rows() {
return mysql_affected_rows();
}

//输出显示sql语句

public function show_error($message = "", $sql = "") {
if (!$sql) {
echo "" . $message . "";
echo "";
} else {
echo "";
echo "错误信息提示:";
echo "";
echo "";
echo "错误号：12142";
echo "

";

echo "错误原因：" . mysql_error() . "

";

echo "

";

echo "" . $message . "";

echo "

";

echo "

" . $sql . "

";

$ip = $this->getip();

if ($this->bulletin) {

$time = date("Y-m-d H:i:s");

$message = $message . "\r\n$this->sql" . "\r\n客户IP:$ip" . "\r\n时间 :$time" . "\r\n\r\n";

$server_date = date("Y-m-d");

$filename = $server_date . ".txt";

$file_path = "error/" . $filename;

$error_content = $message;

//$error_content="错误的数据库，不可以链接";

$file = "error"; //设置文件保存目录

//建立文件夹

if (!file_exists($file)) {

if (!mkdir($file, 0777)) {

//默认的 mode 是 0777，意味着最大可能的访问权

die("upload files directory does not exist and creation failed");

}

}

//建立txt日期文件

if (!file_exists($file_path)) {

//echo "建立日期文件";

fopen($file_path, "w+");

//首先要确定文件存在并且可写

if (is_writable($file_path)) {

//使用添加模式打开$filename，文件指针将会在文件的开头

if (!$handle = fopen($file_path, 'a')) {

echo "不能打开文件 $filename";

exit;

}

//将$somecontent写入到我们打开的文件中。

if (!fwrite($handle, $error_content)) {

echo "不能写入到文件 $filename";

exit;

}

//echo "文件 $filename 写入成功";

echo "——错误记录被保存!";

//关闭文件

fclose($handle);

} else {

echo "文件 $filename 不可写";

}

} else {

//首先要确定文件存在并且可写

if (is_writable($file_path)) {

//使用添加模式打开$filename，文件指针将会在文件的开头

if (!$handle = fopen($file_path, 'a')) {

echo "不能打开文件 $filename";

exit;

}

//将$somecontent写入到我们打开的文件中。

if (!fwrite($handle, $error_content)) {

echo "不能写入到文件 $filename";

exit;

}

//echo "文件 $filename 写入成功";

echo "——错误记录被保存!";

//关闭文件

fclose($handle);

} else {

echo "文件 $filename 不可写";

}

}

}

echo "
";

if ($this->is_error) {

exit;

}

}

echo "