PHP：round() 函数中发生了什么？

Question

I get a time in seconds from my database (stored as an integer):

$time = $data["USER_TIME"];

And then i do the following:

$hours = round(($time / 3600), 0);
$minutes = round((($time - ($hours * 3600)) / 60), 0);
$seconds = $time - ($hours * 3600) - ($minutes * 60);

And i create a time string after:

$timeString = formatNumber($hours).":".formatNumber($minutes).":".formatNumber($seconds);

function formatNumber($number) {
    if($number < 10) {
        return ("0".$number);
    } else {
        return ("".$number);    
    }
}

But the results are confusing for me:

10 seconds -> 00:00:10
15 seconds -> 00:00:15
20 seconds -> 00:00:20
25 seconds -> 00:00:25
30 seconds -> 00:01:-30
35 seconds -> 00:01:-25
40 seconds -> 00:01:-20
45 seconds -> 00:01:-15
50 seconds -> 00:01:-10

Can someone explain me what is happening here?

Var_dump $data["USER_TIME"] :

10 
15
20 
25
30
35
40
45
50

Answer 1

Let's try it with floor . You are using round now, which means everything equal to or above .5 becomes the next integer.

$hours = floor($time / 3600);
$minutes = floor(($time - ($hours * 3600)) / 60);
$seconds = $time - ($hours * 3600) - ($minutes * 60);

Answer 2

您可以使用gmdate()函数代替floor()和round() 。

echo gmdate("H:i:s", 685);