<?php

function redisClient(): ?Redis
{
    static $redis = null;
    static $initialized = false;

    if ($initialized) {
        return $redis;
    }

    $initialized = true;

    if (!class_exists('Redis')) {
        return null;
    }

    if ($redis === null) {
        $config = require __DIR__ . '/../config/config.php';
        $redis  = new Redis();
        try {
            if (!@$redis->connect($config['redis']['host'], $config['redis']['port'])) {
                $redis = null;
            }
        } catch (Throwable $e) {
            $redis = null;
        }
    }

    return $redis;
}