Restrict Dashboard Access

function disable_dashboard_access() {

    $file = basename( $_SERVER['PHP_SELF'] );

    if ( is_user_logged_in() && is_admin() && ! current_user_can( 'edit_posts' ) && $file != 'admin-ajax.php' ) {

        wp_redirect( home_url() );

        exit;

    }

}

add_action( 'init', 'disable_dashboard_access' );