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    <h3>Editing: IntervalChecker.php</h3>
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/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2023 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy\VersionUpdater;

class IntervalChecker extends GitHubChecker
{
    private $cacheFile;
    private $interval;

    public function __construct($cacheFile, $interval)
    {
        $this-&gt;cacheFile = $cacheFile;
        $this-&gt;interval = $interval;
    }

    public function fetchLatestRelease()
    {
        // Read the cached file
        $cached = \json_decode(@\file_get_contents($this-&gt;cacheFile, false));
        if ($cached &amp;&amp; isset($cached-&gt;last_check) &amp;&amp; isset($cached-&gt;release)) {
            $now = new \DateTime();
            $lastCheck = new \DateTime($cached-&gt;last_check);
            if ($lastCheck &gt;= $now-&gt;sub($this-&gt;getDateInterval())) {
                return $cached-&gt;release;
            }
        }

        // Fall back to fetching from GitHub
        $release = parent::fetchLatestRelease();
        if ($release &amp;&amp; isset($release-&gt;tag_name)) {
            $this-&gt;updateCache($release);
        }

        return $release;
    }

    /**
     * @throws \RuntimeException if interval passed to constructor is not supported
     */
    private function getDateInterval(): \DateInterval
    {
        switch ($this-&gt;interval) {
            case Checker::DAILY:
                return new \DateInterval('P1D');
            case Checker::WEEKLY:
                return new \DateInterval('P1W');
            case Checker::MONTHLY:
                return new \DateInterval('P1M');
        }

        throw new \RuntimeException('Invalid interval configured');
    }

    private function updateCache($release)
    {
        $data = [
            'last_check' =&gt; \date(\DATE_ATOM),
            'release'    =&gt; $release,
        ];

        \file_put_contents($this-&gt;cacheFile, \json_encode($data));
    }
}
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