How does caching work in PHP when storing XML data in a database compared to storing it as a file on disk?

When storing XML data in a database, caching can help improve performance by reducing the number of database queries needed to retrieve the data. One way to implement caching in PHP is to store the XML data as a file on disk and check if the file exists before querying the database. If the file exists, the script can read the XML data from the file instead of querying the database, saving time and resources. 

// Check if cached XML file exists
$cacheFile = 'cached_data.xml';
if (file_exists($cacheFile)) {
    $xmlData = file_get_contents($cacheFile);
} else {
    // Query the database to retrieve XML data
    $xmlData = fetchDataFromDatabase();

    // Save XML data to cache file
    file_put_contents($cacheFile, $xmlData);
}

// Process XML data
$xml = simplexml_load_string($xmlData);
// Continue processing XML data...

Keywords

caching PHP XML data database file on disk

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