PHP将整数转换为时间[关闭]

How can I convert integer to time in minutes e.g. 5 would give 30mins. I've tried

<?php
     $toMin = 5; 
     echo date('i', ($toMin*60)).'mins';
?>

But it only returns 05mins

so something like:

$time='7.5'; //, 8.3, 2.2. 

$x=explode('.',$time);

$min=60*($x[1]/10);

echo $x[0] .'hours and '.$min.'mins';