Keep Subscribers Out of the WP Admin Area

no-subscriber-admin.php

<?php
add_action( 'admin_init', 'hide_backend_from_user' );
/**
 * Hide the backend from specific user levels
 * @uses VFH_User_Controls::$options['login_redirect_to'] to determine where the user should be redirected
 * @uses VFH_User_Controls::$user_levels to see if the user needs to be redirected
 */
function hide_backend_from_user( $level='edit_posts' ) {
	/**
	 * Attempt not to short-circuit AJAX requests
	 */
	if ( function_exists( 'doing_ajax' ) && doing_ajax() ) {
		return;
	}
	if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
		return;
	}
	
	if ( ! is_user_logged_in() )
		return;
	
	if ( ! current_user_can( $level ) ) {
		wp_safe_redirect( home_url() );
		exit();
	}
}