displaying time format

[etrader]

I used the following code to convert the length in seconds to min:second format

$sec=$duration % 60;
if ($sec=="0"){
$min=$duration/60;
$duration=''.$min.':00';
}else{
$min=(($duration-$sec)/60);
$duration=''.$min.':'.$sec.'';
}

everything is OK, but it shows 35:5 instead of 35:05. I mean it disregards the first 0 when the second is 1-digit.  :-\

 

[dragon_sa]

$sec=$duration % 60;
if ($sec=="0"){
$min=$duration/60;
$duration=''.$min.':00';
}else{
$min=(($duration-$sec)/60);
if (strlen($sec)=='1') $sec="0".$sec;
$duration=''.$min.':'.$sec.'';
}