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How to use an Image Field within Flexible Content to set the post's featured img

  • Within my Flexible Content, I’ve created a new layout with an Image field. I am trying to use it to update the post’s featured image. After multiple search attempts, the only thing I was able to find was this:

    function acf_set_featured_image( $value, $post_id, $field  ){
        if($value != ''){
    	    //Add the value which is the image ID to the _thumbnail_id meta data for the current post
    	    update_post_meta($post_id, '_thumbnail_id', $value);
        return $value;
    // acf/update_value/name={$field_name} - filter for a specific field based on it's name
    add_filter('acf/update_value/name=featimage', 'acf_set_featured_image', 10, 3);

    Now this code works perfectly with a stand-alone Image Field, but I can’t get it to work through an Image Field within Flexible Content. Can someone help me with this?

  • Hi @byoo

    Please keep in mind that the value of flexible content has a different structure. So it should be something like this:

    function my_acf_save_post( $post_id ) {
        // get the flexible content raw values
        $flexible_content = get_field('flexible_content_field_name', $post_id, false);
        // check if the post has flexible content or not
        if( $flexible_content ){
            // loop through the values
            foreach($flexible_content as $row){
                // check if the image is set in certain layout
                // please change 'layout_name' with your layout name and
                // 'field_1234567890abc' with the image field key
                if( $row['acf_fc_layout'] == 'layout_name' && isset($row['field_1234567890abc']) ){
                    // update the featured image
                    update_post_meta($post_id, '_thumbnail_id', $row['field_1234567890abc']);
    // run after ACF saves the $_POST['acf'] data
    add_action('acf/save_post', 'my_acf_save_post', 20);

    Where “flexible_content_field_name” is the flexible content field name, “layout_name” is the layout name where the image field is located, and “field_1234567890abc” is the image field key.

    I hope this helps 🙂

  • Thank you so much!!

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