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最佳PHP解析RSS类lastRSS

最佳PHP解析RSS类 lastRSS 0.9.1

lastRSS0.9.1.php
<?php
/*
 ======================================================================
 lastRSS 0.9.1
 
 Simple yet powerfull PHP class to parse RSS files.
 
 by Vojtech Semecky, webmaster @ webdot . cz
 
 Latest version, features, manual and examples:
    
http://lastrss.webdot.cz/
 
 ----------------------------------------------------------------------
 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
 ======================================================================
*/

 
/**
* lastRSS
* Simple yet powerfull PHP class to parse RSS files.
*/

class lastRSS {
    
// -------------------------------------------------------------------
    
// Public properties
    
// -------------------------------------------------------------------
    
var $default_cp = 'UTF-8';
    
var $CDATA = 'nochange';
    
var $cp = '';
    
var $items_limit = 0;
    
var $stripHTML = False;
    
var $date_format = '';
 
    
// -------------------------------------------------------------------
    
// Private variables
    
// -------------------------------------------------------------------
    
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');
 
    
// -------------------------------------------------------------------
    
// Parse RSS file and returns associative array.
    
// -------------------------------------------------------------------
    
function Get ($rss_url) {
        
// If CACHE ENABLED
        
if ($this->cache_dir != '') {
            
$cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
            
$timedif = @(time() - filemtime($cache_file));
            
if ($timedif < $this->cache_time) {
                
// cached file is fresh enough, return cached array
                
$result = unserialize(join('', file($cache_file)));
                
// set 'cached' to 1 only if cached file is correct
                
if ($result) $result['cached'] = 1;
            
} else {
                
// cached file is too old, create new
                
$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;
            
}
        
}
        
// If CACHE DISABLED >> load and parse the file directly
        
else {
            
$result = $this->Parse($rss_url);
            
if ($result) $result['cached'] = 0;
        
}
        
// return result
        
return $result;
    
}
    
    
// -------------------------------------------------------------------
    
// Modification of preg_match(); return trimed field with index 1
    
// from 'classic' preg_match() array output
    
// -------------------------------------------------------------------
    
function my_preg_match ($pattern, $subject) {
        
// start regullar expression
        
preg_match($pattern, $subject, $out);
 
        
// if there is some result... process it and return it
        
if(isset($out[1])) {
            
// Process CDATA (if present)
            
if ($this->CDATA == 'content') { // Get CDATA content (without CDATA tag)
                
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
            
} elseif ($this->CDATA == 'strip') { // Strip CDATA
                
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
            
}
 
            
// If code page is set convert character encoding to required
            
if ($this->cp != '')
                
//$out[1] = $this->MyConvertEncoding($this->rsscp, $this->cp, $out[1]);
                
$out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
            
// Return result
            
return trim($out[1]);
        
} else {
        
// if there is NO result, return empty string
            
return '';
        
}
    
}
 
    
// -------------------------------------------------------------------
    
// Replace HTML entities &something; by real characters
    
// -------------------------------------------------------------------
    
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 &apos; entity (missing in HTML_ENTITIES)
        
$trans_tbl += array('&apos;' => "'");
        
// Replace entities by values
        
return strtr ($string, $trans_tbl);
    
}
 
    
// -------------------------------------------------------------------
    
// Parse() is private method used by Get() to load and parse RSS file.
    
// Don't use Parse() in your scripts - use Get($rss_file) instead.
    
// -------------------------------------------------------------------
    
function Parse ($rss_url) {
        
// Open and load RSS file
        
if ($f = @fopen($rss_url, 'r')) {
            
$rss_content = '';
            
while (!feof($f)) {
                
$rss_content .= fgets($f, 4096);
            
}
            
fclose($f);
 
            
// Parse document encoding
            
$result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
            
// if document codepage is specified, use it
            
if ($result['encoding'] != '')
                
{ $this->rsscp = $result['encoding']; } // This is used in my_preg_match()
            
// otherwise use the default codepage
            
else
                
{ $this->rsscp = $this->default_cp; } // This is used in my_preg_match()
 
            
// Parse CHANNEL info
            
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) {
                        
// convert lastBuildDate to specified date format
                        
$result['lastBuildDate'] = date($this->date_format, $timestamp);
            
}
 
            
// Parse TEXTINPUT info
            
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
                
}
            
}
            
// Parse IMAGE info
            
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
                
}
            
}
            
// Parse 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 counter
                    
$i++;
                
}
            
}
 
            
$result['items_count'] = $i;
            
return $result;
        
}
        
else // Error in opening return False
        
{
            
return False;
        
}
    
}
}
 
?>

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