airtime_nginx_php7/airtime_mvc/application/models/formatters/LengthFormatter.php

<?php

class LengthFormatter
{
    /**
     * @string length
     */
    private $_length;

    /*
     * @param string $length formatted H:i:s.u (can be > 24 hours)
     */
    public function __construct($length)
    {
        $this->_length = $length;
    }

    public function format()
    {
        if (!preg_match("/^[0-9]{2}:[0-9]{2}:[0-9]{2}/", $this->_length)) {
            return $this->_length;
        }

        $pieces = explode(":", $this->_length);

        $seconds = round($pieces[2], 1);
        $seconds = number_format($seconds, 1);
        list($seconds, $milliStr) = explode(".", $seconds);

        if (intval($pieces[0]) !== 0) {
            $hours = ltrim($pieces[0], "0");
        }

        $minutes = $pieces[1];
        //length is less than 1 hour
        if (!isset($hours)) {

            if (intval($minutes) !== 0) {
                $minutes = ltrim($minutes, "0");
            }
            //length is less than 1 minute
            else {
                unset($minutes);
            }
        }

        if (isset($hours) && isset($minutes) && isset($seconds)) {
            $time = sprintf("%d:%02d:%02d.%s", $hours, $minutes, $seconds, $milliStr);
        } elseif (isset($minutes) && isset($seconds)) {
            $time = sprintf("%d:%02d.%s", $minutes, $seconds, $milliStr);
        } else {
            $time = sprintf("%d.%s", $seconds, $milliStr);
        }

        return $time;
    }

}