formatting length of time

[mattsoftnet]

I need to write a formatting function for the number of seconds a member has been on a site. the system already counts the seconds and handles sessions and everything. here is the code I have now.

function format_seconds($sc){$mn=0; $hr=0; $dy=0; $wk=0; $mo=0; $yr=0;
while($sc>=60){$mn++; $sc-=60;}
while($mn>=60){$hr++; $mn-=60;}
while($hr>=24){$dy++; $hr-=24;} while($dy>=7){$wk++; $day-=7;}
while($wk>=4){$mo++; $wk-=4;} while($mo>=12){$yr++; $mo-=12;}
return(array('sc'=>$sc,'mn'=>$mn,'hr'=>$hr,'dy'=>$dy,'wk'=>$wk,'mo'=>$mo,'yr'=>$yr));}

I need it to format the seconds like this:
0yr 0mn 0wk 0dy 0:0:0

my function works, but the problem is it's very inefficient when it comes to larger numbers. when it gets up to over a few years, php acts like it's locked up, trying to convert the seconds to minutes. the date function wont work because of all the other formatting things in it. leap years and daylight savings and all that. I need just a simple seconds to minutes hours weeks converter. anyone else know of a way?

[mattsoftnet]

I tried this, but I'm not sure how accurate it is

$mn=floor($sc/60); $sc=$sc-($mn60);
$hr=floor($mn/60); $mn=$mn-($hr60);
$dy=floor($hr/24); $hr=$hr-($dy24);
$wk=floor($dy/7); $dy=$dy-($wk7);
$mo=floor($wk/4); $wk=$wk-($mo4);
$yr=floor($mo/4); $mo=$mo-($yr4);

[Weedpacket]

Try using the modulus $x % $y; (one of the arithmetic [man]operators[/man]) instead of repeated subtraction. In fact, there's code in the user notes on the arithmetic operators page that may interest you.

Of course, either code will be less than perfect, since months aren't always four weeks long (in fact there's only one month that is four weeks long and even that sometimes isn't) and days aren't always 24 hours long. (For that matter, some minutes are not sixty seconds long, but you only get six months' warning about that).