Sum only values 1 from array - php

Question

I have array with variables from $qA01_1 up to $qA30_5 (150 variables). Some of the variables can have value 0 or 1 or 5 (example $qA21_3 = 0 or 1 or 5). And I would like to know how to make sum of all variables which have value 1.
Here part of array
$qA01_1 = $_SESSION['qA01_1']; // example: $qA01_01 can have value 0 or 1 or 5, like other variables
$qA01_2 = $_SESSION['qA01_2']; // $qA01_02 = 0 or 1 or 5
$qA01_3 = $_SESSION['qA01_3']; // $qA01_03 = 0 or 1 or 5
$qA01_4 = $_SESSION['qA01_4']; // $qA01_04 = 0 or 1 or 5
$qA01_5 = $_SESSION['qA01_5']; // $qA01_05 = 0 or 1 or 5
$qA02_1 = $_SESSION['qA02_1']; // $qA02_01 = 0 or 1 or 5
$qA02_2 = $_SESSION['qA02_2']; // $qA02_02 = 0 or 1 or 5
$qA02_3 = $_SESSION['qA02_3']; // $qA02_03 = 0 or 1 or 5
$qA02_4 = $_SESSION['qA02_4']; // $qA02_04 = 0 or 1 or 5
$qA02_5 = $_SESSION['qA02_5']; // $qA02_05 = 0 or 1 or 5
// up to...
$qA30_1 = $_SESSION['qA30_1']; // $qA30_01 = 0 or 1 or 5
$qA30_2 = $_SESSION['qA30_2']; // $qA30_02 = 0 or 1 or 5
$qA30_3 = $_SESSION['qA30_3']; // $qA30_03 = 0 or 1 or 5
$qA30_4 = $_SESSION['qA30_4']; // $qA30_04 = 0 or 1 or 5
$qA30_5 = $_SESSION['qA30_5']; // $qA30_05 = 0 or 1 or 5
Here is proposal but not work. I´m begginer, please for help.
$values = [];
for($i=1;$i<=30;$i++)
{
foreach([1,2,3,4,5] as $index)
{
if(${'qA'.str_pad($i, 2, "0", STR_PAD_LEFT).'_'.$index} == 1)
{
$values[] = ${'qA'.str_pad($i, 2, "0", STR_PAD_LEFT).'_'.$index};
}
}
}
echo $values;

Answer 1

Just loop through the $_SESSION array:
// This is where we'll hold all the saved numbers
// from values ending with _1
$array_of_numbers = [];
// Loop through each session
foreach ( $_SESSION as $key => $val )
{
// Only save the keys that match and equal 1
if ( preg_match('/^qA\d{2}?_\d$/', $key, $matches) && $val == 1 )
{
$array_of_numbers[] = $val;
}
}
// Sum the numbers that we gathered
$sum_of_array = array_sum($array_of_numbers);

Answer 2

If you just want a sum, you don't need the $values array. Just add the value to a $sum variable.
$sum = 0;
for($i=1;$i<=30;$i++)
{
foreach([1,2,3,4,5] as $index)
{
$var = 'qA'.str_pad($i, 2, "0", STR_PAD_LEFT).'_'.$index
if(${$var} == 1)
{
$sum += ${$var};
}
}
}
echo $sum;
BTW, you can't echo an array. If you want to see the contents of an array, use var_dump($values); or print_r($values);

Answer 3

Time for a rethink. No reason to unpack the array like you are doing.
Lets put the $_SESSION values that we are interested in into a new array and work with that. (not necessary to put in to a new array, I just prefer to not work with the super global variables more than necessary)
//Create new array
$myArray = [];
foreach( $_SESSION as $key=>$val ){
if( preg_match('/qA\d{2}_[1-5]/', $key) ){
$myArray[$key] = $val;
}
}
$sum = 0;
foreach( $myArray as $key=>$val ){
if( preg_match('/qA\d{2}_1/', $key) ){
$sum += $val;
}
}
var_dump($sum);

Answer 4

Since the logic here is a bit confusing, I think separating it out into a couple "self-documenting" functions would be better practice. Something like this should work:
$sum = 0;
for ($i = 1; $i <= 30; $i++) {
for ($j = 1; $j <= 5; $j++) {
$qa_index = qa_index($i, $j);
if ($_SESSION[$qa_index] == 1)
$sum++; // no need to _actually_ sum since it's just 1
}
}
function qa_index($major, $minor) {
return 'qA'.left_pad_zeros($major).'_'.$minor."\n";
}
function left_pad_zeros($val, $pad_amount = 2) {
return str_pad($val, $pad_amount, '0', STR_PAD_LEFT);
}
EDIT: I imagine some people might think functions are unnecessary overhead here. And that may be IF whatever application is using this NEEDS to squeeze out every little bit of performance improvement they can. However, if that's not the case, I think this is much better practice as it is much easier to read and maintain.

Answer 5

$TotalVal = 0;
for($i=1; $i<=5; $i++){
for($j=1; $j<=5; $j++){
If($i<10){
$StrVar = 'qA0'.$j.'_'.$i.'[0]'; // considering ur using array if not remove [0].
If ($$StrVar == 1)
$TotalVal = $TotalVal + $$StrVar;
}else{
$StrVar = 'qA'.$j.'_'.$i.'[0]';
If ($$StrVar == 1)
$TotalVal = $TotalVal + $$StrVar;
}
}
}
echo $TotalVal;
This will give you sum of all values which is having 1 if u need 5 change in if condition