WP: Disable Admin Bar

functions.php

// DISABLE ADMIN BAR
if (!function_exists('disableAdminBar')) {  
    function disableAdminBar(){  
    remove_action( 'admin_footer', 'wp_admin_bar_render', 1000 ); // for the admin page  
    remove_action( 'wp_footer', 'wp_admin_bar_render', 1000 ); // for the front end  
    function remove_admin_bar_style_backend() {  // css override for the admin page  
      echo '<style>body.admin-bar #wpcontent, body.admin-bar #adminmenu { padding-top: 0px !important; }</style>';  
    }  
    add_filter('admin_head','remove_admin_bar_style_backend');  
    function remove_admin_bar_style_frontend() { // css override for the frontend  
      echo '<style type="text/css" media="screen"> 
      html { margin-top: 0px !important; } 
      * html body { margin-top: 0px !important; } 
      </style>';  
    }  
    add_filter('wp_head','remove_admin_bar_style_frontend', 99);  
  }  
}    
// add_filter('admin_head','remove_admin_bar_style_backend'); // Original version  
add_action('init','disableAdminBar'); // New version