问php回显函数不打印结果

EN

function getTime($o, $now, $total) {

    //One Day in seconds
    $oneDay = 86400;

    //One Business day (12 hours, 7am-7pm)
    $oneBDay = 43200;

    //Get the timestamp of 7am/7pm for time given

    $sevenAM = mktime('7', '0', '0', m($o), d($o), y($o));
    $sevenPM = mktime('19', '0', '0', m($o), d($o), y($o));

    //If Ticket Start Time is before 7am, we only count from 7am after
    if ($o < $sevenAM) {
        $o = $sevenAM;
    } else {
        $o = $o;
    }

    //Debug to get today
    $today = date('Y-m-d h:i:s a', $o);

    //See if we are within the same business day
    $diff = $now - $o;

    //Debug
    //echo $today.",".$timeSpent.",".$total."\n";

    //If we are not within 1 business day, do this again
    if ($diff > $oneBDay) {

        //Total Time spent for the day
        $timeSpent = $sevenPM - $o;

        //Add todays time to total time
        $total = $total + $timeSpent;

        //Move to tomorrow
        $o = $sevenAM + $oneDay;

        getTime($o, $now, $total);
    }

    //If we are within 1 business day, count the time for today and return our result
    if ($diff < $oneBDay) {
        $time = $diff;
        $total = $total + $time; //for example $total = 123456
                    return $total;
            }
}

echo getTime($o,$now,0); 

function y($o){

    $y = date('Y',$o);
    return $y;
}
function m($o){
    $m = date('m',$o);
    return $m;
}
function d($o){
    $d = date('d',$o);
    return $d;
}

        if ($diff < $oneBDay) {
        $time = $diff;
        $total = $total + $time; //for example $total = 123456
        echo "My Total:".$total;
                    return $total;
            }