What are some common pitfalls when caching SQL queries in PHP, especially when the content varies based on URL parameters?

When caching SQL queries in PHP, a common pitfall is not considering the impact of varying URL parameters on the cached content. To solve this issue, you can include the URL parameters as part of the cache key to ensure that different versions of the content are cached separately based on the parameters. 

// Get the URL parameters
$urlParams = $_SERVER['QUERY_STRING'];

// Generate a unique cache key based on the SQL query and URL parameters
$cacheKey = md5($sqlQuery . $urlParams);

// Check if the data is already cached
if ($cachedData = $cache->get($cacheKey)) {
    // Use the cached data
} else {
    // Execute the SQL query
    $result = $pdo->query($sqlQuery);

    // Cache the result with the unique cache key
    $cache->set($cacheKey, $result);
}

Keywords

SQL queries caching PHP URL parameters dynamic content

Related Questions