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ACF Field in RSS feed (outside of content)

  • Hi there,

    I am trying to create a custom RSS feed. So far, I have a template in my theme folder that is responsible for outputting the RSS: https://tozsdeforum.hu/feed/

    Now here’s the code for it:

    <?php
    /**
     * RSS2 Feed Template for displaying RSS2 Posts feed.
     *
     * @package WordPress
     */
    
    header( 'Content-Type: ' . feed_content_type( 'rss2' ) . '; charset=' . get_option( 'blog_charset' ), true );
    $more = 1;
    
    echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?' . '>';
    
    /**
     * Fires between the xml and rss tags in a feed.
     *
     * @since 4.0.0
     *
     * @param string $context Type of feed. Possible values include 'rss2', 'rss2-comments',
     *                        'rdf', 'atom', and 'atom-comments'.
     */
    do_action( 'rss_tag_pre', 'rss2' );
    ?>
    <rss version="2.0"
    	xmlns:hst="http://hirstart.hu/rss-mod"
    	<?php
    	/**
    	 * Fires at the end of the RSS root to add namespaces.
    	 *
    	 * @since 2.0.0
    	 */
    	do_action( 'rss2_ns' );
    	?>
    >
    
    <channel>
    	<title><?php 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 get_feed_build_date( 'r' ); ?></lastBuildDate>
    	<language><?php bloginfo_rss( 'language' ); ?></language>
    	<sy:updatePeriod>
    	<?php
    		$duration = 'hourly';
    
    		/**
    		 * Filters how often to update the RSS feed.
    		 *
    		 * @since 2.1.0
    		 *
    		 * @param string $duration The update period. Accepts 'hourly', 'daily', 'weekly', 'monthly',
    		 *                         'yearly'. Default 'hourly'.
    		 */
    		echo apply_filters( 'rss_update_period', $duration );
    	?>
    	</sy:updatePeriod>
    	<sy:updateFrequency>
    	<?php
    		$frequency = '1';
    
    		/**
    		 * Filters the RSS update frequency.
    		 *
    		 * @since 2.1.0
    		 *
    		 * @param string $frequency An integer passed as a string representing the frequency
    		 *                          of RSS updates within the update period. Default '1'.
    		 */
    		echo apply_filters( 'rss_update_frequency', $frequency );
    	?>
    	</sy:updateFrequency>
    	<?php
    	/**
    	 * Fires at the end of the RSS2 Feed Header.
    	 *
    	 * @since 2.0.0
    	 */
    	do_action( 'rss2_head' );
    
    	while ( have_posts() ) :
    		the_post();
    		?>
    	<item>
    		<title><?php the_title_rss(); ?></title>
    <?php 
    $post_id = get_the_ID(); 
    $kiemelt = get_field( 'kiemelt_cikk' );
    
    if ( $kiemelt == TRUE ) :
    
    $output = '<hst:titlepage>1</hst:titlepage>';
    endif;
    
    echo $output;
    
    ?>
    
    		<link><?php the_permalink_rss(); ?></link>
    		<?php if ( get_comments_number() || comments_open() ) : ?>
    			<comments><?php comments_link_feed(); ?></comments>
    		<?php endif; ?>
    
    		<dc:creator><![CDATA[<?php the_author(); ?>]]></dc:creator>
    		<pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate>
    		<?php the_category_rss( 'rss2' ); ?>
    		<guid isPermaLink="false"><?php the_guid(); ?></guid>
    
    		<?php if ( get_option( 'rss_use_excerpt' ) ) : ?>
    			<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>
    		<?php else : ?>
    			<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>
    			<?php $content = get_the_content_feed( 'rss2' ); ?>
    			<?php if ( strlen( $content ) > 0 ) : ?>
    				<content:encoded><![CDATA[<?php echo $content; ?>]]></content:encoded>
    			<?php else : ?>
    				<content:encoded><![CDATA[<?php the_excerpt_rss(); ?>]]></content:encoded>
    			<?php endif; ?>
    		<?php endif; ?>
    
    		<?php if ( get_comments_number() || comments_open() ) : ?>
    			<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 endif; ?>
    
    		<?php rss_enclosure(); ?>
    
    		<?php
    		/**
    		 * Fires at the end of each RSS2 feed item.
    		 *
    		 * @since 2.0.0
    		 */
    		do_action( 'rss2_item' );
    		?>
    	</item>
    	<?php endwhile; ?>
    </channel>
    </rss>
    

    Now this is the important part:

    $post_id = get_the_ID(); 
    $kiemelt = get_field( 'kiemelt_cikk' );
    
    if ( $kiemelt == TRUE ) :
    
    $output = '<hst:titlepage>1</hst:titlepage>';
    endif;
    
    echo $output;
    

    For some CPT’s I have a ‘kiemelt_cikk’ checkbox ticked. If this box is ticked, I would like to add a namespace to the RSS. The issue is, that regardless of it being ticked or not, the namespace gets added currently. What might I be doing wrong?

    Thanks!

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