PHP: Determining if a Timestamp Has Expired

Let's say you're caching a file every 24 hours. You need to know when 24 hours has passed since the last cache.

Here's the code:

PHP Code
$LastCacheTime = file_get_contents('LastCacheTime.txt');
if (time() >= strtotime("+24 hours", $LastCacheTime)) {
   // Save the new cache time to disk.
   file_put_contents('LastCacheTime.txt', time());
   // Interval has expired.
}
else {
   // Interval has not expired.
}


In this case, the file LastCacheTime.txt contains the unix timestamp of the last time the interval expired.

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