Problem
You need to know the last time a file was modified.
Solution
Use the File::lastModified() method.
$timestamp = File::lastModified($filename);
if ($timestamp === false)
{
die("Failure getting the time");
}
The value returned is a Unix timestamp.
Discussion
If there's an error, a warning message is emitted.
It's a good idea to make sure the file exists before getting the modification time. See Determining If a File Exists.
