Caching Inside a CraftCMS Plugin

code.php

<?php

// To cache a variable
// function add($key, $value, $secondsToCache)
\Craft::$app->getCache()->add(
    $nameOfCacheKey,
    $valueToCache,
    $numberOfSecondsToCache
);

// To retrieve the cache
// function get($key)
// Will return false if the cache is not available, or the cache has expired
$myCachedObject = \Craft::$app->getCache()->get($nameOfCacheKey);