Plugin for removing admin bar from Webpress site

remove_admin_bar.php

<?php
/*
Plugin Name: Remove admin bar
Author: Denis Gukov
Version: 1.0
*/

add_action('after_setup_theme', 'remove_admin_bar');

function remove_admin_bar() {
    if (!current_user_can('administrator') && !is_admin()) {
      show_admin_bar(false);
    }
}

function hide_admin_bar_backbox() {
    $screen = get_current_screen();
    
    if ($screen->id != 'profile' && $screen->id != 'user-edit') {
        return;
    }
    
    if ($screen->id == 'profile' && current_user_can('administrator')) {
        return;
    }
    
    if ($screen->id == 'user-edit') {
        $user_id = filter_input(INPUT_GET, 'user_id', FILTER_VALIDATE_INT);
        $user_query = new WP_User_Query([ 'search' => $user_id, 'search_columns' => ['ID'] ]);
        foreach ($user_query->results as $user) { // only one, no need break
            if (in_array('administrator', $user->roles)) {
                return;
            }
        }
    }
    
    
    echo "<style>
            .show-admin-bar {
                display: none;
            }
        </style>";
}

add_action('admin_head', 'hide_admin_bar_backbox');