What are common issues related to data freshness in PHP applications?

One common issue related to data freshness in PHP applications is caching outdated data, which can lead to displaying incorrect or stale information to users. To solve this issue, you can implement a cache expiration mechanism that periodically refreshes the cached data. 

// Check if cached data is expired and refresh if necessary
function getFreshData($cacheKey, $expirationTime) {
    $cachedData = getFromCache($cacheKey);
    
    if (!$cachedData || time() - $cachedData['timestamp'] > $expirationTime) {
        $freshData = fetchDataFromSource();
        saveToCache($cacheKey, $freshData);
        return $freshData;
    } else {
        return $cachedData['data'];
    }
}

Keywords

caching database queries cron jobs timestamp cache expiration

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