Add Sum from JSON - php

Question

I'm fairly new with PHP and I need help with adding certain row from JSON file.
For instance i have
Array
(
[0] => Array
(
[id] => 1
[name] => "Computer"
[price] => 1000
)
[1] => Array
(
[id] => 1
[name] => "Mouse"
[price] => 14
)
[2] => Array
(
[id] => 1
[name] => "Computer"
[price] => 1500
)
[3] => Array
(
[id] => 1
[name] => "Mouse"
[price] => 16
)
)
the output should be
Array(
[name] => "Computer"
[sum] => 2500
)
Array(
[name] => "Mouse"
[sum] => 30
)
I tried using this
$i = 0;
foreach ($array as $rows){
$i += $rows['price'];
}
but this one basically adds them all.
I appreciate the help!

Answer 1

Code
<?php
// make origin
$array_origin = array(
array('id' => 1,'name' => 'Computer','price' => 1000),
array('id' => 1,'name' => 'Mouse','price' => 14),
array('id' => 1,'name' => 'Computer','price' => 1500),
array('id' => 1,'name' => 'Mouse','price' => 16),
);
echo '<pre>' . var_export($array_origin, true) . '</pre><hr>';
// store name-price pair
$stack=array();
foreach ($array_origin as $index => $array_part) {
$stack[$array_part['name']]=array_key_exists($array_part['name'],$stack)?$stack[$array_part['name']]+$array_part['price']:$array_part['price'];
}
// make output
$j=0;
$output=array();
foreach ($stack as $name => $sum) {
$output[]=array(
'name' => $name,
'sum' => $sum
);
echo '<pre>' . var_export($output[$j], true) . '</pre>';
$j++;
}
Output
Or use json to make origin array
$json_str='[
{
"id":1,
"name":"Computer",
"price":"1000"
},
{
"id":1,
"name":"Mouse",
"price":14
},
{
"id":1,
"name":"Computer",
"price":1500
},
{
"id":1,
"name":"Mouse",
"price":16
}
]';
$array_origin=json_decode($json_str, true);
Hope it can help you ~

Answer 2

since you wrote all that out, I guess I can write you a quick loop.
$answer = array();
foreach($oldarray as $val)
{
#$answer[$val['name']] += $val['sum'];
}
print_r($answer);
It's not the exact answer, but it will get you there.

Answer 3

Try this code:
$result = [];
foreach ($array as $row) {
if (array_key_exists($row['name'], $result)) {
$result[$row['name']]['sum'] += $row['price'];
} else {
$result[$row['name']] = [
'name' => $row['name'],
'sum' => $row['price'],
];
}
}
print_r($result);