trolley/sender.php

<?php
$file = file("db.txt");
$sum_of_lat = 0;
$sum_of_long = 0;
$array_sum_of_time = array(0,0,0);
$array_inTime = 0;
$average = new stdClass();
$average->latitude = 0;
$average->longitude = 0;
$average->inTime = 0;
$encoded_average = '';
$count_loc = count($file);

for ($i = 0; $i < $count_loc; $i++)
{
        $decoded_location = json_decode($file[$i]);
        $array_inTime = array_map('intval',explode(':',$decoded_location->inTime));
        $array_sum_of_time[0] = $array_sum_of_time[0] + $array_inTime[0];
        $array_sum_of_time[1] = $array_sum_of_time[1] + $array_inTime[1];
        $array_sum_of_time[2] = $array_sum_of_time[2] + $array_inTime[2];
        $sum_of_lat = $sum_of_lat + $decoded_location->latitude;
        $sum_of_long = $sum_of_long + $decoded_location->longitude;
        if ($i+1 == $count_loc)
        {
                $average->latitude = $sum_of_lat/$count_loc;
                $average->longitude = $sum_of_long/$count_loc;
                $average->inTime = strval(floor($array_sum_of_time[0]/$count_loc)) . ":" . strval(floor($array_sum_of_time[1]/$count_loc)) . ":" . strval(floor($array_sum_of_time[2]/$count_loc));
                $encoded_average = json_encode($average);
        }
}
//echo $average->latitude. "<br>". $average->longitude. "<br>". $average->inTime . "<br>". $encoded_average;
header('Content-Type: application/json');
echo $encoded_average;