Check interval between datetimes in PHP

Question

I have a field in database that has type of datetime in which I add time when user visit a page. When user again comes I want to check the interval between his first visit and c

Answer 1

What you can so is, retrieve the the datetime, store it in a variable. Create a var with time().

You can then convert the db datetime to a timestring using strtotime()

Subtract the datetime timestring from the new time. That should give you a difference in seconds. You can then manipulate your values and do the relevant checks.

$db = datetime_from_database;

$now = time();

$last = strtotime($db);

$diff = $now - $last; //this is in seconds

You can do something like

$minutes = $diff / 60;

If ($minutes > 60) echo 'more than 1 hour; 60 minutes';

Just work in it.

You can then use the date functions to format the new datetime using the $now and update the database.

Answer 2

You could try

SELECT COUNT(@UserID) FROM table WHERE LastVisit > (DateADD(now(),interval -1 Hour))

you can then check the count

Edit: added FROM clause

Answer 3

If you have PHP >= 5.3 you can use DateTime objects and functions:

$visit = DateTime::createFromFormat('Y-m-d H:i:s', '2011-03-04 00:25:01');
$now = new DateTime("now");

$diff = $now->diff($visit);