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

• James

• November 23, 2016 at 4:05 pm

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 🙂