Hide admin bar for WP

functions.php

<?php 

/**
 * Hide admin bar
 */

// show admin bar only for admins
if ( ! current_user_can( 'manage_options' ) ) {
    add_filter( 'show_admin_bar', '__return_false' );
}

// show admin bar only for admins and editors
if ( ! current_user_can( 'edit_posts' ) ) {
    add_filter( 'show_admin_bar', '__return_false' );
}