<?php
$grid = new ArtiGrid();
$grid->table('payments')
    ->select2('customerNumber', ['placeholder' => 'Selected category'])
     ->combobox('customerNumber', [
        "Obstetric Nurse (Delivery)" => "Obstetric Nurse (Delivery)",
        "Neonatal Nurse (RN)" => "Neonatal Nurse (RN)",
        "Physician" => "Physician",
        "Pediatrician" => "Pediatrician",
        "Anesthesiologist" => "Anesthesiologist"
     ]);
echo $grid->render('insert');
?>