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How to get logged user id?

I am developing a moule which has one page asking for email frequency; when the user selects and save it, I save it in the user table, but it doesn’t work. It works only when I hard code the user ID.

global $user; $uuid = $user->uid;  function emailf_form_submit($form, &$form_state) {   $bb = $form_state['values']['emailf'];   $query = db_update('users')     ->fields(array('email_f' => $bb))     ->condition('uid', $uuid, '=')     ->execute();     drupal_set_message('Email frequency successfully changed');   }
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How to get logged user id?

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