How can I make a custom field type in symfony2?

Question

I want to make a custom form field in symfony2 named daterange, which will extends the default symfony date type form field and take date range(start date and e

Answer 1

Cause I don't like twig template engine this example only for PHP templating

What you need is to make:

1. New TestBundle\Form\Extension\Core\Type\DateRangeType which extends Symfony\Component\Form\AbstractType

   Here you should:
   a. write your own getParent, getName, buildForm methods
   b. getParent return 'field'
   c. getName return 'daterange'
   d. buildForm has $builder->add('start', ...)->add('end', ...)->setAttribute('widget', 'daterange')
   

2. Add it to the DI (config.yml as example)

    services:
        form.type.daterange:
            class: TestBundle\Form\Extension\Core\Type\DateRangeType
            tags:
                -  { name: form.type, alias: daterange }

3. Create new widget for it in TestBundle/Resources/views/Form/daterange_widget.html.php you can take date widget as example. Src/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/date_widget.html.php

4. Add to config (config.yml as example)

   framework:
       templating:
           form:
               resources:
                   - 'TestBundle:Form'

And for more widget customization as nefo_x said check form customization.