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<?php

/**
* RESTRICT NON-ADMINISTRATORS FROM CREATING, EDITING OR DELETING ADMINISTRATORS
*
*/
function restrict_user_from_creating_admins(){
	class JPB_User_Caps {

		// Add our filters
		function JPB_User_Caps(){
			add_filter( 'editable_roles', array(&$this, 'editable_roles'));
			add_filter( 'map_meta_cap', array(&$this, 'map_meta_cap'),10,4);
		}

		// Remove 'Administrator' from the list of roles if the current user is not an admin
		function editable_roles( $roles ){
			if( isset( $roles['administrator'] ) && !current_user_can('administrator') ){
			  unset( $roles['administrator']);
			}
			return $roles;
		}

		// If someone is trying to edit or delete and admin and that user isn't an admin, don't allow it
		function map_meta_cap( $caps, $cap, $user_id, $args ){

			switch( $cap ){
				case 'edit_user':
				case 'remove_user':
				case 'promote_user':
					if( isset($args[0]) && $args[0] == $user_id )
						break;
					elseif( !isset($args[0]) )
						$caps[] = 'do_not_allow';
					$other = new WP_User( absint($args[0]) );
					if( $other->has_cap( 'administrator' ) ){
						if(!current_user_can('administrator')){
							$caps[] = 'do_not_allow';
						}
					}
					break;
				case 'delete_user':
				case 'delete_users':
					if( !isset($args[0]) )
						break;
					$other = new WP_User( absint($args[0]) );
					if( $other->has_cap( 'administrator' ) ){
						if(!current_user_can('administrator')){
							$caps[] = 'do_not_allow';
						}
					}
					break;
				default:
					break;
			}
			return $caps;
		}
	}
	$jpb_user_caps = new JPB_User_Caps();
}
add_action('admin_init', 'restrict_user_from_creating_admins');

?>