解析RSS类
jerry thinkphp 2015年11月18日
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简单但功能强大的PHP解析RSS文件类。
by Vojtech Semecky, webmaster @ webdot . cz最新版本,更新类容,手册,示例参见: http://lastrss.webdot.cz/ http://sssui.com
我只是摘抄过来,由于英文不好,所以稍加汉化了注释
by Vojtech Semecky, webmaster @ webdot . cz最新版本,更新类容,手册,示例参见: http://lastrss.webdot.cz/ http://sssui.com
我只是摘抄过来,由于英文不好,所以稍加汉化了注释
/*
======================================================================
lastRSS 0.9.1
简单但功能强大的PHP解析RSS文件类。
by Vojtech Semecky, webmaster @ webdot . cz
最新版本,更新类容,手册,示例参见:
http://lastrss.webdot.cz/
http://sssui.com
----------------------------------------------------------------------
LICENSE
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License (GPL)
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
To read the license please visit http://www.gnu.org/copyleft/gpl.html
======================================================================
*/
/*
$rss=new lastRSS(); //实例化
$rss->cache_dir = 'cache'; //设置缓存目录，要手动建立
$rss->cache_time = 3600; //设置缓存时间。默认为0，即随访问更新缓存；建议设置为3600，一个小时
$rss->default_cp = 'UTF-8'; //设置RSS字符编码，默认为UTF-8
$rss->cp = 'GBK'; //设置输出字符编码，默认为GBK
$rss->items_limit = 10; //设置输出数量，默认为10
$rss->date_format = 'U'; //设置时间格式。默认为字符串；U为时间戳，可以用date设置格式
$rss->stripHTML = true; //设置过滤html脚本。默认为false，即不过滤
$rss->CDATA = 'content'; //设置处理CDATA信息。默认为nochange。另有strip和content两个选项
$url = 'http://hi.baidu.com/gincn/rss ';
$data = $rss->Get($url); //处理RSS并获取内容
print_r($data);
*/
/**
* lastRSS
* 简单但功能强大的PHP解析RSS文件类。
*/
class lastRSS {
// -------------------------------------------------------------------
// 共有属性
// -------------------------------------------------------------------
var $default_cp = 'UTF-8';
var $CDATA = 'nochange';
var $cp = '';
var $items_limit = 0;
var $stripHTML = False;
var $date_format = '';
// -------------------------------------------------------------------
// 私有属性
// -------------------------------------------------------------------
var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
var $itemtags = array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
var $imagetags = array('title', 'url', 'link', 'width', 'height');
var $textinputtags = array('title', 'description', 'name', 'link');
// -------------------------------------------------------------------
// 解析RSS文件，并返回关联数组。
// -------------------------------------------------------------------
function Get ($rss_url) {
//如果启用缓存
if ($this->cache_dir != '') {
$cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
$timedif = @(time() - filemtime($cache_file));
if ($timedif < $this->cache_time) {
// 缓存文件是最新,则返回缓存数组
$result = unserialize(join('', file($cache_file)));
// 如果缓存不为空,则设置$cached=1
if ($result) $result['cached'] = 1;
} else {
// 缓存文件已过期,则创建新的缓存文件
$result = $this->Parse($rss_url);
$serialized = serialize($result);
if ($f = @fopen($cache_file, 'w')) {
fwrite ($f, $serialized, strlen($serialized));
fclose($f);
}
if ($result) $result['cached'] = 0;
}
}
// 如果未启用缓存,则直接加载文件
else {
$result = $this->Parse($rss_url);
if ($result) $result['cached'] = 0;
}
return $result;
}
// -------------------------------------------------------------------
// 重定义preg_match(); 返回修正过后的第一个匹配
// from 'classic' preg_match() array output
// -------------------------------------------------------------------
function my_preg_match ($pattern, $subject) {
// 开始正在匹配
preg_match($pattern, $subject, $out);
// 如果结果不为空,则继续
if(isset($out[1])) {
// 处理 CDATA (如果存在)
if ($this->CDATA == 'content') { // 获取 CDATA内容 (不存在 CDATA 标签)
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
} elseif ($this->CDATA == 'strip') { // 去除 CDATA
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
}
//转换成设置的编码
if ($this->cp != '')
$out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
return trim($out[1]);
} else {
return '';
}
}
// -------------------------------------------------------------------
// 替换html实体为真实字符
// -------------------------------------------------------------------
function unhtmlentities ($string) {
// Get HTML entities table
$trans_tbl = get_html_translation_table (HTML_ENTITIES, ENT_QUOTES);
// Flip keys<==>values
$trans_tbl = array_flip ($trans_tbl);
// Add support for ' entity (missing in HTML_ENTITIES)
$trans_tbl += array(''' => "'");
// Replace entities by values
return strtr ($string, $trans_tbl);
}
// -------------------------------------------------------------------
// Parse() 是由GET()调用的私有方法,用来解析RSS文件.
// 所以不要在你的代码中使用Parse(),而是用 Get($rss_file)方法来替代.
// -------------------------------------------------------------------
function Parse ($rss_url) {
//打开RSS文件
if ($f = @fopen($rss_url, 'r')) {
$rss_content = '';
while (!feof($f)) {
$rss_content .= fgets($f, 4096);
}
fclose($f);
// 解析文件编码
$result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
//如果文件编码一致则直接使用
if ($result['encoding'] != '')
{ $this->rsscp = $result['encoding']; } // This is used in my_preg_match()
//否则使用默认的编码
else
{ $this->rsscp = $this->default_cp; } // This is used in my_preg_match()
// 解析 CHANNEL信息
preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
foreach($this->channeltags as $channeltag)
{
$temp = $this->my_preg_match("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
if ($temp != '') $result[$channeltag] = $temp; // Set only if not empty
}
// If date_format is specified and lastBuildDate is valid
if ($this->date_format != '' && ($timestamp = strtotime($result['lastBuildDate'])) !==-1) {
// 解析 lastBuildDate 到指定的时间格式
$result['lastBuildDate'] = date($this->date_format, $timestamp);
}
// 解析 TEXTINPUT
preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
// This a little strange regexp means:
// Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
if (isset($out_textinfo[2])) {
foreach($this->textinputtags as $textinputtag) {
$temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
if ($temp != '') $result['textinput_'.$textinputtag] = $temp; // Set only if not empty
}
}
// 解析 IMAGE
preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
if (isset($out_imageinfo[1])) {
foreach($this->imagetags as $imagetag) {
$temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
if ($temp != '') $result['image_'.$imagetag] = $temp; // Set only if not empty
}
}
// 解析 ITEMS
preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
$rss_items = $items[2];
$i = 0;
$result['items'] = array(); // create array even if there are no items
foreach($rss_items as $rss_item) {
// If number of items is lower then limit: Parse one item
if ($i < $this->items_limit || $this->items_limit == 0) {
foreach($this->itemtags as $itemtag) {
$temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
if ($temp != '') $result['items'][$i][$itemtag] = $temp; // Set only if not empty
}
// Strip HTML tags and other bullshit from DESCRIPTION
if ($this->stripHTML && $result['items'][$i]['description'])
$result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
// Strip HTML tags and other bullshit from TITLE
if ($this->stripHTML && $result['items'][$i]['title'])
$result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
// If date_format is specified and pubDate is valid
if ($this->date_format != '' && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !==-1) {
// convert pubDate to specified date format
$result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
}
// Item 计数
$i++;
}
}
$result['items_count'] = $i;
return $result;
}
else // 文件打开错误返回False
{
return False;
}
}
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