SessionHandlerInterface
SessionHandlerInterface defines the contract for custom PHP session save handlers. Implementing it allows storing sessions in any backend, may it be a Redis server, a database, an encrypted file, etc.
The six methods to implement are open(), close(), read(), write(), destroy(), and gc(). Register the handler with session_set_save_handler().
<?php
class RedisSessionHandler implements SessionHandlerInterface {
private Redis $redis;
public function open(string $path, string $name): bool { return true; }
public function close(): bool { return true; }
public function read(string $id): string|false {
return $this->redis->get('sess:' . $id) ?: '';
}
public function write(string $id, string $data): bool {
return (bool) $this->redis->setex('sess:' . $id, 1440, $data);
}
public function destroy(string $id): bool {
$this->redis->del('sess:' . $id);
return true;
}
public function gc(int $max_lifetime): int|false { return 0; }
}
session_set_save_handler(new RedisSessionHandler());
?>