Redirect users on login

a-login-redirect-to-referrer.php

<?php
/**
 * Redirect user to referrer after successful login.
 *
 * @param string $redirect_to URL to redirect to.
 * @param string $request URL the user is coming from.
 * @param object $user Logged user's data.
 * @return string
 */
function a_login_redirect_to_referrer( $redirect_to, $request, $user ) {
	// is there a user to check?
	if ( isset( $user->roles ) && is_array( $user->roles ) ) {
		if ( in_array( 'administrator', $user->roles ) ) {
			// redirect admins to dashboard reports page
			$redirect_to = admin_url( 'admin.php?page=pmpro-reports' );
			// redirect to referrer
		} elseif ( wp_get_referer() ) {
			$redirect_to = wp_get_referer();
		} else {
			// redirect them to account page
			$redirect_to = home_url();
		}
	}

	return $redirect_to;
}

add_filter( 'login_redirect', 'a_login_redirect_to_referrer', 10, 3 );