Check whether the string is a unix timestamp

Question

I have a string and I need to find out whether it is a unix timestamp or not, how can I do that effectively?

I found this thread via Google, but it doesn\'t come up

Answer 1

this looks like the way to go:

function is_timestamp($timestamp) {
    if(strtotime(date('d-m-Y H:i:s',$timestamp)) === (int)$timestamp) {
        return $timestamp;
    } else return false;
}

you could also add a is_numeric() check and all sort of other checks.
but this should/could be the basics.