Drupal - Alter Node Form

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/**
 * Implements hook_form_alter().
 */
// Replace HOOK with your module name, lower case and underscores instead of spaces.
function HOOK_form_alter(&$form, &$form_state, $form_id) {
  // Replace node_machine_name with node machine name.
  if ($form_id == 'node_machine_name_node_form') {
    // Complete array structure of your content type form.
    print_r($form);
    // or use devel module pretty print.
    dpm($form);
  }
}
Programming Language: PHP