php date function calculation not working

Hello i am learning php i tried to use the date function to display the cur开发者_如何学Pythonrent time. I have an if statement to check the current time whether it is greater than the next hour. Here is the code

<?
$current_time= date('G:i:s');
$next_time= date('G:i:s',strtotime('+1hour'));
if($current_time > $next_time )
{

    echo $current_time." is greater than ".$next_time;


}
?>

At the time of writing this code it was 9:23:39 and the next hour should have been 10:23:39

Surprisingly i got :

9:23:39 is greater than 10:23:39

Am i missing something here. Please help

Keep in mind you are comparing strings, not numbers. 9 is greater than 1 and therefore returns true.

Either use the DateTime class to do this, or compare the unix timestamps (time() and strtotime('+1hour'))

you could use a integer to work the if statement

$var = date("U",timestamp)

to get the number of Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT) thus giving you a number which you can determine which one is greater.