Lazy Sessions

Introduction

PHP 7.0 introduced a new interface called SessionUpdateTimestampHandlerInterface. As of Symfony 4.0 this has been added to the PHP7 Polyfill component

Syntax

interface SessionUpdateTimestampHandlerInterface
{
    // Checks if a session identifier already exists or not.
    public function validateId(string $key) : bool;
 
    // Updates the timestamp of a session when its data didn't change.
    public function updateTimestamp(string $key, string $val) : bool;
}