Sum of array in php, array generated from excel file - php

Question

I am reading excel file in php. I want to show the total of one column in the last row. To do that I need to get the total sum of below array.
part of code to get the below array is,
Array ( [0] => 1 ) Array ( [0] => 2 )
$file = "$filename";
$sheet = (isset($_POST['sheet'])) ? $_POST['sheet'] : '';
$connection = new Spreadsheet_Excel_Reader();
$connection->read($file);
echo"<table>";
$x = 1;
while ($x <= $connection->sheets[$sheet]['numRows']) {
echo "\t<tr>\n";
$y=1;
while ($y <= $connection->sheets[$sheet]['numCols']) {
$cell = isset($connection->sheets[$sheet]['cells'][$x][$y]) ? $connection->sheets[$sheet]['cells'][$x][$y] : '';
echo "\t\t<td>$cell</td>\n";
$y++;
}
echo "\t</tr>\n";
$x++;
}
$x = 2;
while ($x <= $connection->sheets[$sheet]['numRows']) {
$ctnqty = isset($connection->sheets[$sheet]['cells'][$x][16]) ?
$connection->sheets[$sheet]['cells'][$x][16] : '';
$ctnqtyttl = explode(",",$ctnqty);
print_r ($ctnqtyttl);
$x++;
}
I'm suing below code to get the sum of above array, but its giving me the result of 2 only. Please help me here to get the sum 3.
$sum = 0;
foreach ($ctnqtyttl as $value) {
echo $sum = $sum + $value;
}

Answer 1

$ctnqtyttl is overwritten each time with a new value in your second while loop, so it forgets any previous values. The sum you calculate will only be based on the last value it has.
Skip the final foreach loop, and calculate the sum during the second while loop as follows:
$sum = 0; // <-------
$x = 2;
while ($x <= $connection->sheets[$sheet]['numRows']) {
$ctnqty = isset($connection->sheets[$sheet]['cells'][$x][16]) ?
$connection->sheets[$sheet]['cells'][$x][16] : '';
$ctnqtyttl = explode(",", $ctnqty);
print_r ($ctnqtyttl);
$sum += array_sum($ctnqtyttl); // <-------
$x++;
}