Disable WP Admin Bar

disable-admin-bar.php

<?php
/* Disable the Admin Bar. */
// From: http://yoast.com/disable-wp-admin-bar/
add_filter( 'show_admin_bar', '__return_false' );

function sp_hide_admin_bar_settings()
    {
        ?><style type="text/css">.show-admin-bar {display: none;}</style><?php
    }

function sp_disable_admin_bar() {
    add_filter( 'show_admin_bar', '__return_false' );
    add_action( 'admin_print_scripts-profile.php', 
         'sp_hide_admin_bar_settings' );
}
add_action( 'init', 'sp_disable_admin_bar' , 9 );
/* ------------------------------------------------------------------ */
?>