PHP Array Keep Data and Calculating By Its Index - php

Question

I have a list of number in array. Here's my example data:
Person 1 => 20, 40, 50
Person 2 => 10, 20, 40
Person 3 => 20, 20, 30
I want to ask, how to put their scores to an array and calculate it by it index? My code to create this array:
$indeksarr = 1;
$temparr[$indeksarr] = array();
$num = 3;
while($grade = $query->fetch_array()) <-- basically get score from DB (only return score for each student)
{
for($i=1; $i <= $num; $i++)
{
$newdata = array($indeksarr => $grade);
$temparr[$indeksarr][] = $newdata;
$indeksarr++;
}
}
for($i=1; $i <= $num; $i++)
{
print_r($temparr[$i]);
}
My code result:
Result[1] = 20
Result[2] = 10
The result that I want:
Result[1] = 50 ( <- 20+10+20 ) <- all from array index 1
Result[2] = 80 ( <- 40+20+20 ) <- all from array index 2
Result[3] = 120 ( <- 50+40+30 ) <- all from array index 3
Any idea to fix my array?

Answer 1

Please try below code once, it might help for dynamic values also.
while ($grade = $query->fetch_array()) {
//$grdata = explode(",", $grade); // if those are comma separated values
$grdata = $grade;
for ($j = 0, $k = 1; $j < count($grdata); $j++, $k++) {
if (isset($temparr[$k])) {
$temparr[$k] = $temparr[$k] + $grdata[$j];
} else {
$temparr[$k] = $grdata[$j];
}
}
}
print_r($temparr);

Answer 2

biuld array like below
$persons = array('Person1'=>array(20,40,50),'Person2' => array(10, 20, 40),'Person3' => array(20, 20, 30));
//than perform below function
$array_sum = array_reduce($persons,"abb");
function abb($a,$b)
{
foreach($b as $key=>$value)
{
if(isset($a[$key]))
$a[$key] += $value;
else
$a[$key] = $value;
}
return $a;
}
var_dump($array_sum);
o/p
array (size=3)
0 => int 50
1 => int 80
2 => int 120

Answer 3

try this:
$result = array();
$start_index = 1;
$stop_index = 3;
while($grade = $query->fetch_array()) //<-- basically get score from DB (only return score for each student)
{
// grade = array('Person 1' => array(20,10,20));
$values = array_values($grade);
$result[$start_index] = array_sum($values[0]);
if ($start_index == $stop_index) break; // stop when it reach stop_index
$start_index++;
}
echo "<pre>";
print_r($result);
echo "</pre>";
die;

Answer 4

Here's a simple alternative using array_walk and array_sum:
$subTotal = [[0,0,0],[0,0,0],[0,0,0]];
$line = 0;
function walk($item, $key) {
global $subTotal;
global $line;
$subTotal[$key][$line] = $item;
}
$array = [
[20, 40, 50],
[10, 20, 40],
[20, 20, 30]
];
$finalArray = [];
array_walk($array[0], 'walk');
$line = 1;
array_walk($array[1], 'walk');
$line = 2;
array_walk($array[2], 'walk');
$finalArray[] = array_sum($subTotal[0]);
$finalArray[] = array_sum($subTotal[1]);
$finalArray[] = array_sum($subTotal[2]);
// Will print '50, 80, 120, '
foreach($finalArray as $total) {
echo $total.', ';
}
Hope this helps!