How to sum same field values in multidimentional array - php

Question

I have to admit that understanding the tables are big challenge for me so please dont judge me so hard...
This is my array:
Array
(
[names] => Array
(
[0] => Name1
[1] => Name2
[2] => Name1
)
[ids] => Array
(
[0] => 1
[1] => 2
[2] => 1
)
[quantities] => Array
(
[0] => 255
[1] => 2
[2] => 467
)
)
And i wish to sum "quantities" where names or ids are the same.
Example output should be:
Array
(
[names] => Array
(
[0] => Name1
[1] => Name2
)
[ids] => Array
(
[0] => 1
[1] => 2
)
[quantities] => Array
(
[0] => 722
[1] => 2
)
)
I know there is a function like "array_reduce" but don't know how to use it.
Thanks for help!

Answer 1

try this
$result = [];
foreach($array['ids'] as $key=>$val ){
if(array_key_exists($val, $result)){
$result[$val]['sum_quantity'] += $array['quantities'][$key];
}
else{
$result[$val]['sum_quantity'] = $array['quantities'][$key];
$result[$val]['name'] = $array['names'][$key];
$result[$val]['id'] = $array['ids'][$key];
}
}
and output will be like this
Array
(
[1] => Array //array key = id
(
['name'] => Name1,
['sum_quantity'] => 722,
['id'] => 1
)
[2] => Array
(
['name'] => Name2,
['sum_quantity'] => 2,
['id'] => 2
)
)

Answer 2

You can do this way :
$testArray['names'][0]='name1';
$testArray['names'][1]='name2';
$testArray['names'][2]='name1';
$testArray['ids'][0]=1;
$testArray['ids'][1]=2;
$testArray['ids'][2]=1;
$testArray['quantities'][0]=255;
$testArray['quantities'][1]=2;
$testArray['quantities'][2]=467;
echo "<pre>";
print_r($testArray);
$unqArray['names']=array();
$unqArray['ids']=array();
$unqArray['quantities']=array();
foreach($testArray['ids'] as $key=>$value)
{
if(!in_array($value,$unqArray['ids']))
{
$unqArray['names'][]=$testArray['names'][$key];
$unqArray['ids'][]=$testArray['ids'][$key];
$quantity=0;
foreach($testArray['ids'] as $keyId=>$valueId)
{
if($valueId==$value)
{
$quantity+=$testArray['quantities'][$keyId];
}
}
$unqArray['quantities'][]=$quantity;
}
}
print_r($unqArray);
echo "</pre>";