How to set custom permission for buttons or fields in Drupal?

Question

I wrote a module for Drupal and I have some fields (buttons, image, text).

I want that some fields could be hidden for normal users and open for users when admin let.

This feature is implemented using "Field Permission" module. I don't know how to write PHP code in my module, so can I change permissions using "Field Permission" module?

Answer 1

In your module you can set the #access of those fields depending on roles like:

$roleId = The role id;
// If user doesn't have the role he can't access the field .
if (isset($user->roles[$roleId])) {
  // Deny access to the field.
  $form['FIELD_NAME']['#access'] = FALSE;
}