Convert seconds(float) into mm:ss:ms in php

Question

I have the below php function which takes a time argument in seconds from a database. The seconds are of type float(6,1) in the database. I then pass that value to the function below. The problem i have is if i have 1655.5 seconds i can get the hour, minutes and seconds. But how do i get the milliseconds that remain.

ie 1655.5 = 27m:35s.5ms

Thanks for any help in advance.

<?php
    function convertTo($init)
    {
          $hours = ($init / 3600);
          $minutes = (($init / 60) % 60);
          $seconds = $init % 60;

            if($minutes < 10)
            {
                $minutes = "0".$minutes;
            }

            if($seconds < 10)
            {
                $seconds = "0".$seconds;
            }

          $milli = /* code to ret the remaining milliseconds */   
          $stageTime = "$minutes:$seconds.$milli";
          return $stageTime;
    }

?>

Answer 1

Possibly slightly counter-intuitively, the easiest way would be to extract the milliseconds as the first step.

Simply floor() the initial value, and subtract the result from the input. This will give you just the right-hand side of the decimal point, you can then multiply this by 1000 to give you the number of milliseconds - which you should then cast to an integer to ensure the resulting string is sensible.

function convertTo($init)
{
      $secs = floor($init);
      $milli = (int) (($init - $secs) * 1000);

      $hours = ($secs / 3600);
      $minutes = (($secs / 60) % 60);
      $seconds = $secs % 60;
      // ...