Publish an XML feed from a CPT with ACF fields?

Question

Here’s a fairly complete example of one way to do this.

Let’s register a Job post type that will be used with our feed.

/**
 * Register Job post type
 * https://developer.wordpress.org/reference/functions/register_post_type/
 */
function wpse_register_job_post() {
    $book_args = [
        'label'              => __( 'Jobs', 'textdomain' ),
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => [ 'slug' => 'jobs' ],
        'capability_type'    => 'post',
        'has_archive'        => true,
        'hierarchical'       => false,
        'menu_position'      => null,
        'supports'           => [ 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments', 'custom-fields' ],
    ];
    register_post_type( 'jobby_job', $book_args );
}
add_action( 'init', 'wpse_register_job_post' );

Now for the good stuff. Let’s create our custom feed and renderer. The feed can be accessed by visiting http://example.com/?feed=indeed

Register Feed

/**
 * Create a custom feed.
 * https://developer.wordpress.org/reference/functions/add_feed/
 */
function wpse_add_indeed_job_feed() {
    add_feed( 'indeed', 'wpse_render_indeed_job_feed' );
}
add_action( 'init', 'wpse_add_indeed_job_feed' );

Render Feed

/**
 * Render our custom feed.
 */
function wpse_render_indeed_job_feed() {
    header( 'Content-Type: ' . feed_content_type( 'rss2' ) . '; charset=" . get_option( "blog_charset' ), true );

    echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?' . '>';
    ?>

<source>
<publisher><?php wp_title_rss(); ?></publisher>
<publisherurl><?php echo get_site_url(); ?></publisherurl>
<lastBuildDate><?php echo date( 'D, j M Y G:i:s' ) . ' GMT'; ?></lastBuildDate>
<?php
    // Get the job posts. Customize arguments as needed.
    $job_query = new WP_Query( [
        'post_type'      => 'jobby_job',
        'posts_per_page' => 42,
    ] );

if ( $job_query->have_posts() ) {
    while ( $job_query->have_posts() ) {
        $job_query->the_post();

        // Note: You'll need to get the various post meta fields and add them below.
        // Use get_post_meta() or for ACF, get_field() can be used.
        // Meta is hard coded in this example.
?>
<job>
    <title><![CDATA[<?php the_title_rss(); ?>]]></title>
    <date><![CDATA[<?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?>]]></date>
    <referencenumber><![CDATA[unique123131]]></referencenumber>
    <url><![CDATA[<?php the_permalink_rss(); ?>]]></url>
    <company><![CDATA[Big ABC Corporation]]></company>
    <city><![CDATA[Phoenix]]></city>
    <state><![CDATA[AZ]]></state>
    <country><![CDATA[US]]></country>
    <postalcode><![CDATA[85003]]></postalcode>
    <description><![CDATA[<?php echo get_the_content_feed( 'rss2' ); ?>]]></description>
    <salary><![CDATA[$50K per year]]></salary>
    <education><![CDATA[Bachelors]]></education>
    <jobtype><![CDATA[fulltime, parttime]]></jobtype>
    <category><![CDATA[Category1, Category2, CategoryN]]></category>
    <experience><![CDATA[5+ years]]></experience>
</job>
<?php } ?>
<?php } ?>
</source>
<?php
wp_reset_postdata();
}

For reference, WP’s default RSS feed template is located at wp-includes/feed-rss2.php.

Remember to clear your cache when working on customizing the feed since browsers tend to cache the output.

Some other resources:

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