datetime - PHP convert integer to time -

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how can convert integer time in minutes e.g. 5 give 30mins. i've tried 

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

but returns 05mins

so like:

$time='7.5'; //, 8.3, 2.2.   $x=explode('.',$time);  $min=60*($x[1]/10);  echo $x[0] .'hours , '.$min.'mins';

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