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  • Hi,

    In your case, you are only updating 1 field, it’d be better to just target that field in the loop. It’s just safer to not messed up other saved value.

    try something like this:

    function temp_update_value() {
        // 1. get all the posts first
        $allPosts = new WP_Query([
            'post_type' => 'post', // assuming your field is added on 'post' post type
            'posts_per_page' => -1
        // 2. loop through each posts, and update the acf value
        while ($allPosts->have_posts()): $allPosts->the_post();
            // 3. check if the value is already set, if it does, go to next post
            if (get_field('key_1234567890') !== null) {
            // 3. update the acf value by the field key
            update_field('key_1234567890', 'your value');
        endwhile; wp_reset_query();
    // 4. just in case, use acf/init to make sure acf is finish initilizing
    add_action('acf/init', 'temp_update_value');

    put this inside your functions.php file, and refresh any page once to kick it off. After than remember to remove or comment out from you functions.php so it doesn’t get run every time.