Exclude posts from WordPress feed

exclude-posts-from-feed.php

<?php // phpcs:ignore

add_action( 'pre_get_posts', 'exclude_posts_from_feed', 10, 1 );

/**
 * Exclude posts from feed
 *
 * Exclude posts from feed based on a boolean metadata (maybe set by an ACF
 * field): exclude_from_feed
 *
 * @param WP_Query $query The WP_Query instance (passed by reference).
 *
 * @see https://developer.wordpress.org/reference/hooks/pre_get_posts/
 *
 * @return void
 */
function exclude_posts_from_feed( WP_Query $query ) : void {
	if ( ! $query->is_feed ) {
		return;
	}

	if ( 'post' !== $query->get( 'post_type' ) ) {
		return;
	}

	$meta_query = array(
		'relation' => 'OR',
		array(
			'key'     => 'exclude_from_feed',
			'value'   => '',
			'compare' => 'NOT EXISTS',
		),
		array(
			'key'     => 'exclude_from_feed',
			'value'   => '0',
			'compare' => '==',
		),
	);

	$query->set( 'meta_query', $meta_query );
}

This saved my day. Thanks for taking the time to post it up!

This saved my day. Thanks for taking the time to post it up!

You're welcome!