<?php
/****************************************************************************

	PHP Program:----: FeedBuilder [PHP] (TM)
	Version:--------: v4
	Author:---------: Rob Rayburn
	Affiliation:----: Appcitement, LTD. (C)2012, All Rights Reserved
	Website:--------: www.Appcitement.com
	Licence:--------: Appcitement (C) Closed Source Product
	
****************************************************************************/



// define and/or input RSS+XML feed document and location on server, mapped through a relative path
//
$var_rss_feed_file_document		=	''.$var_blog_rss_path.''.$var_blog_category.'.xml';

$var_rss_feed_file_location		=	''.$var_path_to_rss_file.'';


// number of days old RSS feed should be
//
$var_age_of_rss_feed_in_days	=	"900";


// define and/or input feed article variables
//

/* title node */
$var_item_title			=	''.$var_article_title.'';

/* pubDate node */ 		
$var_item_pubDate		=	''.$var_article_date.'';

/* link node */ 		
$var_item_link			=	''.$var_blog_website.'/blog-articles/'.$var_article_file.'';

/* description node */ 	
$var_item_description	=	''.$var_article_rss_description.'';

/* guid node */ 		
$var_item_guid			=	$var_item_link;


// determine if program should clean the feed
//
switch($var_feedbuilder_job) {
	
	default: die("404 ERROR");		
    	
	case "clean":


// define and/or input feed header variables
//

/* title node */ 
$var_rss_feed_channel_title			=	"Rob Rayburn's ".$var_type_title;

/* link node */ 
$var_rss_feed_channel_link			=	"http://www.RobRayburn.com/blog".$var_type_link."/";

/* description node */ 
$var_rss_feed_channel_description	=	$var_type_description." Rob Rayburn";

/* language node */ 
$var_rss_feed_channel_language		=	"en-us";

/* copyright node */ 
$var_rss_feed_channel_copyright		=	"Copyright 2012, Rayburn Media, LLC.";

/* atomlink node */ 
$var_rss_feed_channel_atomlink		=	"http://robrayburn.com/rss/".$var_rss_feed_file_document."";


// open RSS feed
//
$var_file_handler = fopen("".$var_rss_feed_file_location."","w") or die("404 ERROR");


// update RSS feed LAST BUILD DATE
//
$var_rss_feed_channel_lastBuildDate		=	date("D, d M Y H:i:s");


// set time zone
//
$var_rss_feed_channel_lastBuildDate 	= 	$var_rss_feed_channel_lastBuildDate." GMT";


// clean the feed
//
$var_rss_xml_output = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>

<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">

	<channel>
	
		<title>".htmlentities($var_rss_feed_channel_title, ENT_QUOTES)."</title>

		<link>".htmlentities($var_rss_feed_channel_link, ENT_QUOTES)."</link>

		<description>".htmlentities($var_rss_feed_channel_description, ENT_QUOTES)."</description>

		<language>".htmlentities($var_rss_feed_channel_language, ENT_QUOTES)."</language>

		<copyright>".htmlentities($var_rss_feed_channel_copyright, ENT_QUOTES)."</copyright>

		<lastBuildDate>".htmlentities($var_rss_feed_channel_lastBuildDate, ENT_QUOTES)."</lastBuildDate>
		
		<atom:link href=\"".htmlentities($var_rss_feed_channel_atomlink, ENT_QUOTES)."\" rel=\"self\" type=\"application/rss+xml\" />
		
	</channel>
	
</rss>";


// write data to RSS feed
//
fwrite($var_file_handler, $var_rss_xml_output);


// close RSS feed
//
fclose($var_file_handler);


// finish cleaning the feed
//
break;


// determine if program should update the feed
//
case "update":	
    	
	
// reformat HTML elements to standard DOM format to be processed by PHP for XML
//
/* &amp; */
$var_item_title 			=	str_replace("&amp;", "&", $var_item_title);
$var_item_pubDate 			=	str_replace("&amp;", "&", $var_item_pubDate);
$var_item_link 				=	str_replace("&amp;", "&", $var_item_link);
$var_item_description 		=	str_replace("&amp;", "&", $var_item_description);
$var_item_guid 				=	str_replace("&amp;", "&", $var_item_guid);
/* &apos; */
$var_item_title 			=	str_replace("&apos;", "'", $var_item_title);
$var_item_pubDate 			=	str_replace("&apos;", "'", $var_item_pubDate);
$var_item_link 				=	str_replace("&apos;", "'", $var_item_link);
$var_item_description 		=	str_replace("&apos;", "'", $var_item_description);
$var_item_guid 				=	str_replace("&apos;", "'", $var_item_guid);
/* &#39; */
$var_item_title 			=	str_replace("&#39;", "'", $var_item_title);
$var_item_pubDate 			=	str_replace("&#39;", "'", $var_item_pubDate);
$var_item_link 				=	str_replace("&#39;", "'", $var_item_link);
$var_item_description 		=	str_replace("&#39;", "'", $var_item_description);
$var_item_guid 				=	str_replace("&#39;", "'", $var_item_guid);
/* &#039; */
$var_item_title 			=	str_replace("&#039;", "'", $var_item_title);
$var_item_pubDate 			=	str_replace("&#039;", "'", $var_item_pubDate);
$var_item_link 				=	str_replace("&#039;", "'", $var_item_link);
$var_item_description 		=	str_replace("&#039;", "'", $var_item_description);
$var_item_guid 				=	str_replace("&#039;", "'", $var_item_guid);


// explode RSS feed PUBLISH DATE and list its individual parts
//
$var_list_date = explode(" ", $var_item_pubDate);
	
	list($var_weekday, $var_day_number, $var_month_name, $var_year, $var_time_str, $var_time_zone) = $var_list_date;


	// switch abbreviated month name to its corresponding numerical month number
	//
	switch($var_month_name) {
	
		default: die("404 ERROR");	
    	
		case "Jan":
			$var_month_number = "1";
		break;
		
		case "Feb":
			$var_month_number = "2";
		break;
		
		case "Mar":
			$var_month_number = "3";
		break;
		
		case "Apr":
			$var_month_number = "4";
		break;
		
		case "May":
			$var_month_number = "5";
		break;
		
		case "Jun":
			$var_month_number = "6";
		break;
		
		case "Jul":
			$var_month_number = "7";
		break;
		
		case "Aug":
			$var_month_number = "8";
		break;
		
		case "Sep":
			$var_month_number = "9";
		break;
		
		case "Oct":
			$var_month_number = "10";
		break;
		
		case "Nov":
			$var_month_number = "11";
		break;
		
		case "Dec":
			$var_month_number = "12";
		break;

	}


// reformat RSS feed PUBLISH DATE in YYYY-MM-DD format, seconds not accounted for, ultimately for lack of significance
//
$var_item_pubDate_ymd = $var_year."-".$var_month_number."-".$var_day_number;


// convert RSS feed PUBLISH DATE to Unix time stamp format
//
$var_CompareDate_strtotime = strtotime($var_item_pubDate_ymd); 


// RSS feed is being built every time this program runs, so output the current date in YYYY-MM-DD format
//
$var_CurrentDate = date("Y-m-d");


// convert RSS feed BUILD DATE to Unix time stamp format
//
$var_CurrentDate_strtotime = strtotime($var_CurrentDate);


// calculates the number of days elapsed multiplied by the number of seconds in one day
//
$var_age_of_rss_feed_in_seconds = $var_age_of_rss_feed_in_days * 86400;


// RSS feed BUILD DATE minus the desired age of the RSS feed calculated in seconds
//
$var_CurrentDate_strtotime_subtracted = $var_CurrentDate_strtotime - $var_age_of_rss_feed_in_seconds;


	// if the article is older than the desired age of the RSS feed it will not be added 
	//
	if ($var_CompareDate_strtotime < $var_CurrentDate_strtotime_subtracted) {

		// Warning: This article WILL NOT be added to the RSS feed! 
		// Reason: This article is to old to be added to the RSS feed.

	}


	// else the article is not older than the desired age of the RSS feed and will be added the RSS feed
	//
	else {

		// create an XML Document space in memory through the DOM
		//
		$var_xmlDOMDoc = new DOMDocument;


		// load an XML Document into the DOM memory slot
		//
		$var_xmlDOMDoc -> load($var_rss_feed_file_location);


		// open the RSS CHANNEL node
		//
		$var_openCHANNELnode = $var_xmlDOMDoc -> getElementsByTagName('channel')->item(0);


		// create a new RSS ITEM node
		//
		$var_newITEMnode = $var_xmlDOMDoc -> createElement('item');


		// create a new RSS TITLE node, fill with text
		//
		$var_newTITLEnode = $var_xmlDOMDoc -> createElement('title');
		$var_newTITLEnodeTEXT = $var_xmlDOMDoc -> createTextNode ($var_item_title);
		$var_newTITLEnode -> appendChild($var_newTITLEnodeTEXT);


		// create a new RSS DATE node, fill with text
		//
		$var_newDATEnode = $var_xmlDOMDoc -> createElement('pubDate');
		$var_newDATEnodeTEXT = $var_xmlDOMDoc -> createTextNode ($var_item_pubDate);
		$var_newDATEnode -> appendChild($var_newDATEnodeTEXT);


		// create a new RSS LINK node, fill with text
		//
		$var_newLINKnode = $var_xmlDOMDoc -> createElement('link');
		$var_newLINKnodeTEXT = $var_xmlDOMDoc -> createTextNode ($var_item_link);
		$var_newLINKnode -> appendChild($var_newLINKnodeTEXT);


		// create a new RSS DESCRIPTION node, fill with text
		//
		$var_newDESCRIPTIONnode = $var_xmlDOMDoc -> createElement('description');
		$var_newDESCRIPTIONnodeTEXT = $var_xmlDOMDoc -> createTextNode ($var_item_description);
		$var_newDESCRIPTIONnode -> appendChild($var_newDESCRIPTIONnodeTEXT);


		// create a new RSS GUID node, fill with text
		//
		$var_newGUIDnode = $var_xmlDOMDoc -> createElement('guid');
		$var_newGUIDnodeTEXT = $var_xmlDOMDoc -> createTextNode ($var_item_guid);
		$var_newGUIDnode -> appendChild($var_newGUIDnodeTEXT);


		// append ITEM node with new data
		//
		$var_newITEMnode -> appendChild($var_newTITLEnode);
		$var_newITEMnode -> appendChild($var_newDATEnode);
		$var_newITEMnode -> appendChild($var_newLINKnode);
		$var_newITEMnode -> appendChild($var_newDESCRIPTIONnode);
		$var_newITEMnode -> appendChild($var_newGUIDnode);


		// append CHANNEL node with new data
		//
		$var_openCHANNELnode -> appendChild($var_newITEMnode);


		// save XML Document, currently loaded within the DOM memory slot, to a Non Applicable variable
		//
		$var_run_NA = $var_xmlDOMDoc -> save($var_rss_feed_file_location);	

	}


// finish updating the feed
//
break;
}


?>