WPRM Move last custom field up at the top of the booking form

gistfile1.php

class WPRM_Move_last_custom_field_up extends WPRM_Custom_Fields {

    /**
     * Add new fields to the metaboxes in the admin panel
     * 
     * @since 1.0.0
     * @return void
     */
    public function add_new_fields_to_booking_form( $booking_fields ) {

        $prefix = '_wprm_';
        $get_field_options = null;
        $is_required = null;
        $new_fields = array_reverse(WPRM_Custom_Fields::get_custom_fields());

        if(!empty($new_fields)):

            foreach ($new_fields as $new_field) {

                // Check if the field is a select type
                // if so - retrieve the options.
                if($new_field['type'] == 'select') {
                    $get_field_options = explode(',', $new_field['options']);
                }

                // Check if the field is required or not
                if($new_field['required'] == 'on') {
                    $is_required = true;
                } else {
                    $is_required = false;
                }

                // Add the new field to the booking form
                $booking_fields[] = array(
                    'type'      => $new_field['type'],
                    'label'     => $new_field['title'],
                    'name'      => $prefix . $new_field['slug'],
                    'desc'      => $new_field['description'],
                    'options' => $get_field_options,
                    'placeholder' => $new_field['placeholder'],
                    'value' => isset($_POST[$prefix.$new_field['slug']]) ? sanitize_text_field($_POST[$prefix.$new_field['slug']]) : '',
                    'selected' => isset($_POST[$prefix.$new_field['slug']]) ? sanitize_text_field($_POST[$prefix.$new_field['slug']]) : '',
                    'required' => $is_required
                );

            }

        endif;

        return array_merge(array_splice($booking_fields, -1), $booking_fields);

    }

}

new WPRM_Move_last_custom_field_up;