#drupal checked if logged in / role

multiple_user_roles.php

<?php
  global $user;

  $has_role = array_intersect(array('administrator', 'Other admin', 'Client admin'), array_values($user->roles));
  if (empty($has_role) ? FALSE : TRUE) {
    // This user has any one of the three roles
  }
?>

user_loggedin.php

<?php if ($logged_in): ?>
  <strong>Do something...</strong>
<?php endif; ?>

<?php if (!$logged_in): ?>
  <strong>Do something else...</strong>
<?php endif; ?>

<?php
  global $user;

  // Check to see if $user has the administrator role.
  if (in_array('administrator', array_values($user->roles))) {
    // Do something.
  }
  
  // Check for multpile $users
  if (in_array('administrator', array_values($user->roles)) && in_array('OtherAdmin', array_values($user->roles))) {
    // Do something.
  }
?>