PHP - Conditioned sum of some values of an array - php

Question

I have an array in PHP of this type, resulting from a particular query on a db.
$output = Array
(
[0] => Array
(
'price' => 100
'date' => '2015-07-28'
'total' => 200
'qty' => 2
)
[1] => Array
(
'price' => 80
'date' => '2015-07-28'
'total' => 240
'qty' => 3
)
[2] => Array
(
'price' => 100
'date' => '2015-07-29'
'total' => 300
'qty' => 3
)
[3] => Array
(
'price' => 90
'date' => '2015-07-28'
'total' => 90
'qty' => 1
)
)
I'm trying to sum total and qty based on price key values, obtaining an array that will look like this:
$grouped = Array
(
[0] => Array
(
[price] => 100
[sumtotal] => 500
[sumqty] => 5
)
[1] => Array
(
[price] => 80
[sumtotal] => 240
[sumqty] => 3
)
[2] => Array
(
[price] => 90
[sumtotal] => 90
[sumqty] => 1
)
)
Still cannot find a way to get around this.

Answer 1

Try using simple foreach loop as
$result = array();
foreach ($output as $key => $value) {
$hash = $value['price'];
if (isset($result[$hash])) {
$result[$hash]['price'] = $value['price'];
$result[$hash]['sumtotal'] += $value['total'];
$result[$hash]['sumqty'] += $value['qty'];
} else {
$result[$hash]['price'] = $value['price'];
$result[$hash]['sumtotal'] = $value['total'];
$result[$hash]['sumqty'] = $value['qty'];
}
}
print_r(array_values($result));
Demo

Answer 2

I don't understand, it's the same array without the date.. ?
Edit :
Ok try this
$temp= array();
for($i=0; $i<sizeof($outpout);$i++)
{
if(!isset($temp[$i]))
$temp[$i]=array();
$temp[$i][$outpout[$i]['price']]+=$outpout[$i]['qty']];
}
$res=array();
$count=0;
foreach($temp as $key => $value)
{
$res[$count]['price']=$key;
$res[$count]['qty']=$value;
$res[$count]['total']=$key*$value;
$count++;
}

Answer 3

Okay, here's a simple complete code to solve your problem.
$output=array();//this is your array
$price_index=array();
$final_array=array();
foreach($output as $key=>$value)
{
//first check if price is already in $price_index
if(!isset($price_index[$value["price"]]))
{
$price_index[$value["price"]]=sizeof($price_index);
}
$final_index=$price_index[$value["price"]];
if(isset($final_array[$final_index]))
{
$final_array[$final_index]["total"]+=$value["total"];
$final_array[$final_index]["qty"]+=$value["qty"];
}
else
{
$final_array[$final_index]["total"]=$value["total"];
$final_array[$final_index]["qty"]=$value["qty"];
$final_array[$final_index]["price"]=$value["price"];
}
}
//display our final array
print_r($final_array);
What I did:
iterate through your array
check if the current price has been added to $final_array before, by creating $price_index array that contains price as key and the value is the index of $output array on the first time the price occurred.
now if the price occur again, the $price_index[current price] will be detected that it is already been set before, then we will use the value as the index of our $final_array and add the current total and qty to existing.
then display the array (optional).
Hope it helps. Please don't just copy my code, analyze and understand it mate :)