How to Create form in PHP based Drupal as a module?



<?php
function appointment_menu($may_cache) {
    $items = array();
    $items[] = array(
    'path' => 'app',
    'title' => t('App'),
    'callback' => 'drupal_get_form',  // tell drupal to display a form
    'callback arguments' => array('appointment_form'), // arguments for the callback have to be in an array. The form name is now 'appointment_form'
    'access' => user_access('access content'),
     'type' => MENU_CALLBACK);
    return $items;
}

// Builder function needs the same name as form
function appointment_form() {
    $form['name'] = array(
    '#type' => 'textfield',
    '#title' => t('Name'),
    '#size' => 30,
    '#maxlength' => 64);
  ...
  $form['submit'] = array('#type' => 'submit', '#value' => t('Save'));
  $output = drupal_get_form('appointment_form', $form);
  return $output;
}

// Validate function is form name with 'validate' suffix
function appointment_form_validate($form_id, $form_values) {
   form_set_error('', t('Error messages show here.'));
}

// Submit function is form name with 'submit' suffix
function appointment_form_submit($form_id, $form_values) {
    drupal_set_message(t('Your form has been saved.'));
}
?>


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