php - Can't access user details with get_user_by or wp_get_current_user function in WordPress on wp_login hook -

i'm building plugin needs user's name , email when log in wordpress site. i've tried using both get_user_by() , wp_get_current_user() functions in wordpress no avail. i'm using wp_login action hook.

example of code:

function send_login_notification() {     $user_info  = get_user_by('id', get_current_user_id());     $user_name  = ucfirst($user_info->user_login);     $user_email = $user_info->user_email;      [...]  }  add_action('wp_login', 'send_login_notification'); 

however, presented following error sometimes, not always:

notice: trying property of non-object in [file path] on line 48  notice: trying property of non-object in [file path] on line 49 

if refresh, chances work, strange. hit-and-miss.

i don't have experience of particular hook, sounds uses session / cookie hold user details. in case first call happening before session created/available. however, on refresh session available , code works.

have tried setting priority on action ensure occurs late possible? events have priority of 10 setting action somewhere after job.

add_action('wp_login', 'send_login_notification', 15, 2); 

if doesn't work, should take @ codex or here indicates authenticate user yourself, can build user data manipulate own code.

$user = wp_authenticate($username, $password); 

hopefully, adding line make difference.

it seems neither of above methods sufficient ensure login session available script, small change function required make use of data available function via wp_login.

function send_login_notification($username, $password) {     $user_info = get_user_by('login', $username);