Custom RSS feed for WordPress with the latest updated posts.

recently-updated-feed.php

<?php
	/**
	 * Template Name: RSS - Recently Updated
	 */

	$args = array(
	        'post_type'      		=> 'post',
	        'post_status'   		=> 'publish',
	        'orderby'        		=> 'modified',
	        'order'          		=> 'DESC',
	        'ignore_sticky_posts' 		=> '1',
	        'caller_get_posts'		=> 1
	);

	$updated = new WP_Query($args);

	header('Content-Type: '.feed_content_type('rss-http').'; charset='.get_option('blog_charset'), true);
	echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
?>

<rss version="2.0"
        xmlns:content="http://purl.org/rss/1.0/modules/content/"
        xmlns:wfw="http://wellformedweb.org/CommentAPI/"
        xmlns:dc="http://purl.org/dc/elements/1.1/"
        xmlns:atom="http://www.w3.org/2005/Atom"
        xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
        xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
        <?php do_action('rss2_ns'); ?>>
<channel>
        <title><?php bloginfo_rss('name'); ?> - Recently Updated Feed</title>
        <atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
        <link><?php bloginfo_rss('url') ?></link>
        <description><?php bloginfo_rss('description') ?></description>
        <lastBuildDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('blog'), false); ?></lastBuildDate>
        <language>en-US</language>
        <sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
        <sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
        <?php do_action('rss2_head'); ?>
        <?php 
                while($updated->have_posts()) : $updated->the_post(); 

		$product_img = wp_get_attachment_image_src( get_post_thumbnail_id( $post_id ), $isize );
                $getImg = $product_img[0];

		$today = current_time('Y-m-d');
		$pub = get_the_time('Y-m-d', $updated->ID);
		$mod = get_the_modified_time('Y-m-d', $updated->ID);

		$modIFTTT = get_the_modified_time('D, d M Y H:i:s +0000', $updated->ID);

	       if ( $pub !== $today && $mod === $today ) :
        ?>
                <item>
                        <title><?php the_title_rss(); ?></title>
                        <link><?php the_permalink_rss(); ?></link>
                        <pubDate><?php echo $modIFTTT; ?></pubDate>
                        <dc:creator><?php the_author(); ?></dc:creator>
                        <guid isPermaLink="false"><?php the_guid(); ?></guid>
                        <description><![CDATA[<img src="<?php echo $getImg; ?>" width="250"><br> <?php the_excerpt_rss() ?>]]></description>
                        <content:encoded><![CDATA[<?php the_excerpt_rss() ?>]]></content:encoded>
                        <?php rss_enclosure(); ?>
                        <?php do_action('rss2_item'); ?>
                </item>
        <?php endif; endwhile; ?>
</channel>
</rss>