Snippet #008 Using transients to cache data. https://since1979.dev/snippet-008-using-transients-to-cache-data/

use-maybe-cache.php

<?php
$posts = maybeCache('remote_posts_data', 7200, function () {
    return do_remote_get('https://jsonplaceholder.typicode.com/posts/');
});

foreach ($posts as $post) {
    echo "<h2>{$post->title}</h2>";
}