Only show admin bar to administrators

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<?php

// Snippet code goes here!
if (!current_user_can('administrator')) :
  show_admin_bar(false);
endif;

?>

Instructions:

Paste this code in your theme’s functions.php file to hide the admin bar to all logged in users except admins. Useful for sites that have public registration turned on.

Related links:

http://www.wpbeginner.com/wp-tutorials/how-to-disable-wordpress-admin-bar-for-all-users-except-administrators/