How to call hook in template.php after login from any user in drupal 7? [closed]

Question

I am using below code to get the user login gender information & store in SESSION, I want to call below code after login, I already try this hook function bartik_user_login(&$edit, $account) {}but its not working. Please help. Thanks

if (user_is_logged_in())
{    
global $user;
    $uid = user_load($user->uid);
    $profile_main = profile2_load_by_user($uid, 'main');
    $field_iam = field_get_items('profile2',$profile_main,'field_i_am_field');
    $_SESSION['i_am']=$field_iam[0][value];
    echo $_SESSION['i_am'];
}

Answer 1

You should use preprocess function. For example -

function yourtheme_preprocess_user_login(&$vars) {
  $vars['intro_text'] = t('This is my awesome login form');
}

The general flow is:

theme($hook, $var) >> preprocess functions >> process functions >> finally either goto template.php or call theme function >> return output as string

therefore, template.php or theme function call is the final destination, no hook runs after template.php

Answer 2

You should use this hook in a custom module. You should also not tamper with core code as the Bartik theme directly. Also take a look at this:

How do I save session data for the anonymous users?