prepare_value_for_response example

foreach ( $fields as $meta_key => $args ) {
            $name       = $args['name'];
            $all_values = get_metadata( $this->get_meta_type()$object_id$meta_key, false );

            if ( $args['single'] ) {
                if ( empty( $all_values ) ) {
                    $value = $args['schema']['default'];
                } else {
                    $value = $all_values[0];
                }

                $value = $this->prepare_value_for_response( $value$request$args );
            } else {
                $value = array();

                if ( is_array( $all_values ) ) {
                    foreach ( $all_values as $row ) {
                        $value[] = $this->prepare_value_for_response( $row$request$args );
                    }
                }
            }

            $response[ $name ] = $value;
        }
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