Come creare feed RSS aggiuntivi con testo completo

Ecco come creare un feed personalizzato:

Per prima cosa crea un nuovo file nella directory del tuo tema, chiamalo your-custom-feed.php e inserisci questo codice all'interno

<?php

     /**
      * Feed RSS personalizzato.
      *
      * @package WordPress
      */

     header('Content-Type: ' . feed_content_type('rss-http') . '; charset=' . get_option('blog_charset'), true);
     $more = 1;

    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'); wp_title_rss(); ?></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('GMT'), false); ?></lastBuildDate>
            <language><?php echo get_option('rss_language'); ?></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( have_posts()) : the_post(); ?>
            <item>
                <title><?php the_title_rss() ?></title>
                <link><?php the_permalink_rss() ?></link>
                <comments><?php comments_link_feed(); ?></comments>
                <pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
                <dc:creator><?php the_author() ?></dc:creator>
                <?php the_category_rss('rss2') ?>

                <guid isPermaLink="false"><?php the_guid(); ?></guid>
                <description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
            <?php if ( strlen( $post->post_content ) > 0 ) : ?>
                <content:encoded><![CDATA[<?php the_content_feed('rss2') ?>]]></content:encoded>
            <?php else : ?>
                <content:encoded><![CDATA[<?php the_excerpt_rss() ?>]]></content:encoded>
            <?php endif; ?>

                <wfw:commentRss><?php echo esc_url( get_post_comments_feed_link(null, 'rss2') ); ?></wfw:commentRss>
                <slash:comments><?php echo get_comments_number(); ?></slash:comments>
        <?php rss_enclosure(); ?>
            <?php do_action('rss2_item'); ?>
            </item>
            <?php endwhile; ?>
        </channel>
    </rss>

poi aggiungi una semplice funzione per richiamare quel file template usando do_feed_$hook

//carica il template del feed
function create_my_customfeed() {
    load_template( TEMPLATEPATH . 'your-custom-feed.php'); 
}
add_action('do_feed_mycustomfeed', 'create_my_customfeed', 10, 1);

Ora quando accedi a http://yoursite.com/?feed=mycustomfeed otterrai un feed completo, indipendentemente da ciò che hai definito nell'admin di WordPress.

Bonus

se vuoi creare una regola di riscrittura per il tuo feed personalizzato in modo che l'URL possa essere:

http://yoursite.com/mycustomfeed.xml oppure http://yoursite.com/feed/mycustomfeed/

aggiungi questo codice al tuo file functions.php:

//crea regola di riscrittura per il feed

function custom_feed_rewrite($wp_rewrite) {
    $feed_rules = array('feed/(.+)' => 'index.php?feed=' . $wp_rewrite->preg_index(1),'(.+).xml' => 'index.php?feed='. $wp_rewrite->preg_index(1));
    $wp_rewrite->rules = $feed_rules + $wp_rewrite->rules;
}