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How to replace custom post type slug by an ACF value?

  • I have a drop down select type field. The values are Video and Image.

    I want to replace the Custom post type slug. Currently, it is video.

    I want to change to or

    I mean when the drop down value Video is selected, it will show

    I can replace the post type slug.

    function update_video_slug( $args, $post_type) {

    $cptslug = “newslug”;

    if ( ‘video’ === $post_type ) {
    $args[‘rewrite’][‘slug’] = $cptslug;

    return $args;


    add_filter( ‘register_post_type_args’, ‘update_video_slug’, 10, 2 );

    Can be the $cptslug value dynamic according to ACF value?

  • It would depend on the order that things happen. Usually you add custom post types on the init hook. ACF also initializes on the init hook. To use get_field() ACF needs to be initialized before you try to get the value. You may also run into an issue if you try to get a field before ACF fires the acf/include_fields hook.

    In this case, assuming that this is on an options page, I would use the built in WP function get_option() to get the ACF field value. Usually on an options page the option name will be “options_YOUR-FIELD-NAME”. Doing this you don’t need to worry about ACF when you register your post type.

  • I want to get values directly from the ACF fields.

    How to initialize the ACF in init hook? Any example?

  • Basically, you need to make sure that you’re creating your post types after acf has initialized. You can do this by adding your action that creates the post types with a sufficiently high priority.

    add_action('init', 'my_register_post_types', 20); // priority 20 is after acf/init
    function my_register_post_types() {
      // register your post types
      // get_field() should work
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