Query only displays one page_id

by

The p parameter accepts a single integer value, not a string or array of integers.

You would want to use the post__in parameter which allows for an array of post id’s. Just a few notes here:

  • You will need to check if you actually have a valid array of post ID’s before passing it to post__in. If an empty array is passed, WP_Query fails epically in that it returns all posts regardless. So be very carefull with this

  • post__in will return sticky posts as well, so you would want to consider adding 'ignore_sticky_posts' => 1 to your query args

  • You will need to convert the string of post ID’s to an array using wp_parse_id_list() before passing the ID’s to post__in

You can probably try something like this:

$value = get_field( 'event_hotels', false );
// Check if we have a valid string
if ( $value ) {
    $post_id_array = wp_parse_id_list( $value );
    // Make sure we have a valid array of ID's
    if ( $post_id_array ) {
        $args = [
            'post__in'            => $post_id_array,
            'ignore_sticky_posts' => 1,
            // REST OF YOUR ARGS
        ];
        $loop = new WP_Query( $args );

        // Your loop

        wp_reset_postdata(); // After your loop, VERY IMPORTANT

    }
}