Putting Array with same values into another array? - php

Question

I have one big array which has a load of similar values but I want to put all the arrays with the same value into another array. For example, I have this array.
array(4) {
[0]=>
array(8) {
["symbol"]=>
string(3) "aaaa"
["name"]=>
string(7) "aaaa"
["buy_price"]=>
string(14) "100.0000000000"
["current_worth"]=>
string(14) "100.2500000000"
}
[3]=>
array(8) {
["symbol"]=>
string(3) "aaa"
["name"]=>
string(7) "aaaaa"
["buy_price"]=>
string(14) "100.0000000000"
["current_worth"]=>
string(14) "100.2500000000"
}
[2]=>
array(8) {
["symbol"]=>
string(3) "xxx"
["name"]=>
string(7) "xxxxx"
["buy_price"]=>
string(14) "100.0000000000"
["current_worth"]=>
string(14) "100.2500000000"
}
}
I want to be able run this array through a foreach loop and then output the array results together that all have the same name. Like too
Name aaa
-- Name aaa [0]
-- Name aaa [1]
Name xxx
-- Name xxx [0]
I am struggling how to do the logic.

Answer 1

If I understand correctly, you need some reducing. Assuming that $origin_array contain what you need to transform:
$result = array_reduce($origin_array, function ($carry, $item) {
$name = $item['name'];
$carry[$name][] = $item;
return $carry;
}, []);
This code will make 2-dimensional array where elements grouped by name field of origin array.
Explanation
The best explanation will be to write analogical foreach loop:
$my_reduce = function ($carry, $item) { // callback, 2-nd param
$name = $item['name'];
$carry[$name][] = $item;
return $carry;
};
$result = []; // initial value, 3 param
foreach($origin_array as $item) {
$result = $my_reduce($result, $item);
}
This is roughly speaking what happens under the hood of array_reduce function.