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  • Wonderful! You saved me a good headache!

    Here is my/your final code, hope someone finds it useful!

    /* When a ACF "Featured article" (in 71% articles) is set to true, all the rest are updated to false */
    /* First you would have to add acf/save_post action to you function.php so the action runs every time a post is saved or udpated run before ACF saves the $_POST['fields'] data */
    add_action('acf/save_post', 'my_acf_save_post', 1);
    function my_acf_save_post( $post_id ){
    	$fields = false;
    	$catId = 27;
    	/* Here I added a if statement so the code runs only for a defined category */
    	if ( in_category( $catId, $post_id ) ) {
    		// Check if Fields have been posted
    		if ( isset( $_POST['fields'] ) ) {
    			$fieldId = 'field_5343d06c3e9dc';
    			$fields = $_POST['fields'];
    			// Store the true/false field on a variable (change the "Field_xxx" id by yours)
    			$featuredArticle = $fields[$fieldId];
    			// Check if the true/false field is true
    			if ( $featuredArticle ) {
    				/* If it's set to true do a WP_query so you can get the other post that have $featuredArticle set to true here you may want to change the 'cat' to whatever your is (or to all) in the meta query you should use your true/false field name as a key */
    				$args = array(
    					'cat' => $catId,
    					'meta_query' => array(
    							'key' => 'featured_article',
    							'value' => '1',
    							'compare' => '=='
    				$post_query = new WP_Query( $args );
    				/* Here we check if the query returns post (if it does it will return featured posts) */
    				if ( $post_query->have_posts() ) {
    					while ( $post_query->have_posts() ) {
    						/* For each posts we update the true/false field and set it to false */
    						update_field( $fieldId, false, get_the_ID() );
    } // end my_acf_save_post