Question

I’m having a problem. I’ve got a file that I only want to update on a daily basis. So I’m using filemtime and an expiry timestamp and checking them against each other…problem is I’m getting the echo statement every time I’m refreshing the page. Any ideas?

$time_expire = time() + 24*60*60; // Expire Time (1 Day)
// Check file change time
if(filemtime($cache_filename) <= $time_expire) {
    echo 'file is too old - refresh it'; 
}

Answer 1

Just think through the logic slowly:

• expiry timestamp is one day in the future from now
• check if the modification timestamp is lower than or equal to the expiry timestamp

Yes, I think that will always be true. Unless your file is From The Future™.
Your expiry timestamp has to be a day in the past.