php 生成rss文件

第一种传统的是直接用php输出语句，按照rss结构规范，新建一个rss文件

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<?php

connect_sql();

$arr = getall();

$files_url = "mytest/test.xml";

/*$xml_head = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";*/

$xml_head = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";

$xml_head .= "<rss version=\"2.0\">\n";

$xml_head .= "<channel>\n";

$xml_head .= "<title>测试rss</title>\n";

$xml_head .= "<link>http://www.baidu.com</link>\n";

$xml_head .= "<description>这是一个测试rss</description>\n";

writes($xml_head,$files_url);

$xml_body = "";

foreach ($arr as $key => $val) {

$xml_body .= "<item>\n";

$xml_body .= "<user>\n";

$xml_body .= "<user_id>".$val['user_id']."</user_id>\n";

$xml_body .= "<user_name>".$val['username']."</user_name>\n";

$xml_body .= "<user_pass>".$val['pass']."</user_pass>\n";

$xml_body .= "<real_name>".$val['real_name']."</real_name>\n";

$xml_body .= "</user>\n";

$xml_body .= "<title>".$val['username']."</title>\n";

$xml_body .= "<link>http://www.baidu.com</link>\n";

$xml_body .= "<description>id:".$val['user_id'].",username:".$val['username'].",pass:".$val['pass'].",real_name:".$val['real_name']."</description>\n";

$xml_body .= "</item>\n";

}

writes($xml_body,$files_url);

$xml_foot = "</channel>\n";

$xml_foot .= "</rss>\n";

writes($xml_foot,$files_url);

function writes($contents,$url){

$fopen = fopen($url, 'a+');

if(!fwrite($fopen, $contents)){

echo "写入失败！";

}

fclose($fopen);

}

function connect_sql(){

$con = mysql_connect('localhost','root','123456') or die('mysql error :'.mysql_error());

mysql_select_db('test');

mysql_query('set names utf8');

}

function getall(){

$sql = "SELECT * FROM user";

$query = mysql_query($sql);

$content = array();

while($row = mysql_fetch_array($query)){

$content[] = $row;

}

return $content;

}

?>

第二种是利用php DOMdocument组件

$doc = new DOMDocument('1.0','utf-8');

$doc->formatOutput = true;

//创建标签

//创建rss标签

$rss = $doc->createElement('rss');

//创建channel下面的标签

$channel = $doc->createElement('channel');

$ctitle = $doc->createElement('title');

$clink = $doc->createElement('link');

$cdescription = $doc->createElement('description');

foreach ($arr as $key => $val) {

//创建item标签

$item = $doc->createElement('item');

//创建item下的子标签标签

$user = $doc->createElement('user');

$ititle = $doc->createElement('title');

$ilink = $doc->createElement('link');

$idescription
= $doc->createElement('description');

//创建user标签

$user_id = $doc->createElement('user_id');

$user_name = $doc->createElement('user_name');

$user_pass = $doc->createElement('user_pass');

$real_name = $doc->createElement('real_name');

/*这里是需要数据库循环调用的地方*/

//创建内容

//创建item下面的标签的内容

$c_ititle = $doc->createTextNode($val['user_id']);

$c_ilink = $doc->createTextNode('http://www.xxx.com');

$c_idescription = $doc->createTextNode('id:'.$val['user_id'].',user_name:'.$val['user_name'].',pass:'.$val['pass'].',real_name:'.$val['real_name']);

//创建user下面的标签的内容

$c_user_id
= $doc->createTextNode($val['user_id']);

$c_user_name = $doc->createTextNode($val['user_name']);

$c_user_pass = $doc->createTextNode($val['pass']);

$c_real_name = $doc->createTextNode($val['real_name']);

//创建item属性值

$a_id = $doc->createTextNode($val['user_id']);

//创建属性

$attributes = $doc->createAttribute('id');

/*这里是需要数据库循环调用的地方*/

//item一级标签的元素内容继承

$ititle->appendChild($c_ititle);

$ilink->appendChild($c_ilink);

$idescription->appendChild($c_idescription);

//user一级标签的元素内容继承

$user_id->appendChild($c_user_id);

$user_name->appendChild($c_user_name);

$user_pass->appendChild($c_user_pass);

$real_name->appendChild($c_real_name);

/*这里是需要数据库循环调用的地方*/

//继承

$channel->appendChild($item);

//item一级标签的标签继承

$item->appendChild($user);

$item->appendChild($ititle);

$item->appendChild($ilink);

$item->appendChild($idescription);

//id=1

$attributes->appendChild($a_id);

//<item id="1">

$item->appendChild($attributes);

//item一级标签的标签继承

$user->appendChild($user_id);

$user->appendChild($user_name);

$user->appendChild($user_pass);

$user->appendChild($real_name);

}

//创建内容

//创建channel下面的标签的内容

$c_ctitle = $doc->createTextNode('测试rss');

$c_clink = $doc->createTextNode('http://www.xxx.com');

$c_cdescription = $doc->createTextNode('这是一个测试rss');

//创建rss版本属性值

$rss_attribute_c = $doc->createTextNode('2.0');

//创建rss版本属性

$rss_attribute = $doc->createAttribute('version');

//继承

//channel一级标签的元素内容继承

$ctitle->appendChild($c_ctitle);

$clink->appendChild($c_clink);

$cdescription->appendChild($c_cdescription);

//version="2.0"

$rss_attribute->appendChild($rss_attribute_c);

//channel一级标签的标签继承

$channel->appendChild($ctitle);

$channel->appendChild($clink);

$channel->appendChild($cdescription);

//创建根节点

$rss->appendChild($channel);

$rss->appendChild($rss_attribute);

$doc->appendChild($rss);

//保存xml文件

$doc->save('hello.xml');

function writes($contents,$url){

$fopen = fopen($url, 'a+');

if(!fwrite($fopen, $contents)){

echo "写入失败！";

}

fclose($fopen);

}

function connect_sql(){

$con = mysql_connect('localhost','root','123456') or die('mysql error :'.mysql_error());

mysql_select_db('test');

mysql_query('set names utf8');

}

function getall(){

$sql = "SELECT * FROM test";

$query = mysql_query($sql);

$content = array();

while($row = mysql_fetch_array($query)){

$content[] = $row;

}

return $content;

}

看见这么多代码，我写完的时候也晕了，但是要是一层一层的写还是很简单的

无非就是 创建标签，创建内容，将内容放入标签中，将子标签放入父标签中

$rss = $doc->createElement('rss');

$doc->appendChild($rss);

我是先一层一层的写，首先写成静态的，然后改成调用数据库，这样就变成动态的了

这样代码过于冗余，于是我写了一个function

//$node是要创建的元素 key是元素名称 value是内容 parent_node是父节点标签名称

function createnode($nodes,$parent_node,$doc){

foreach ($nodes as $key => $value) {

//不论内容存不存在都要创建标签

$label = $doc->createElement($key);

//如果有内容就创建内容节点并添加到标签下

if($value){

$content = $doc->createTextNode($value);

$label->appendChild($content);

}

//将创建好的标签和内容添加到父标签下

$$parent_node->appendChild($label);

}

}

但是貌似不行

文件有了，接着就是显示给订阅了新闻的会员，这里就要读取rss了，类似于下面

$doc = new DOMDocument();

$doc->load("../test.xml");

$data = $doc->getElementsByTagName("real_name");

$arr = array();

foreach ($data as $val) {

$arr[] = $val->nodeValue;

}

print_r($arr);