Date Difference in PHP

There is a easy method for find date difference in php.

But this method didn't work after i hosted my files.

So i came up with following. it is generating difference in days. but you can use other calculations for generate Months, years. This is a simple method.

$from = date("Y-m-d",strtotime('2011-04-01'));

$to= date("Y-m-d",strtotime('2011-04-06'));

$diff = strtotime($from )-strtotime($to);

echo floor($diff / (60*60*24));

60*60*24 = Generate Days (86400)

"year" = 29030400,

// seconds in a year (12 months)
"month" = 2419200, // seconds in a month (4 weeks)
"week" = 604800, // seconds in a week (7 days)
"day" = 86400, // seconds in a day (24 hours)
"hour" = 3600, // seconds in an hour (60 minutes)
"minute" = 60, // seconds in a minute (60 seconds)
"second" = 1 // 1 second