PHP How to restructure an array? - php

Question

I have an array that I'd like to restructure. I want to group items by turn. I can figure out how to extract data from the array using foreach($arr['history'] as $obj) my issue is with populating a new array using a loop.
Currently it looks like this:
Array (
[history] => Array (
[id] => 23452435
[legend] => Array (
[0] => Array (
[player] => me
[turn] => 1
[card] => Array (
[name] => foo
)
)
[1] => Array (
[player] => me
[turn] => 1
[card] => Array (
[name] => bar
)
)
[2] => Array (
[player] => opponent
[turn] => 1
[card] => Array (
[name] => derp
)
)
[3] => Array (
[player] => opponent
[turn] => 2
[card] => Array (
[name] => hoo
)
)
)
))
I want it to look like the following, but I can't figure out how to automatically create and populate this structure. This is an array with a sub-array for each turn, containing an array for me and opponent
Array (
[0] => Array (
[me] => Array (
[0] => foo
[1] => bar
)
[opponent] = Array (
[0] => derp
)
)
[1] => Array (
[me] => Array ()
[opponent] => Array (
[0] => hoo
)
))
Thanks.
Edit:
This is what I needed. Thanks for the answers.
$result = [];
foreach ($arr['history'] as $historyItem) {
foreach ($historyItem['legend'] as $list) {
$result[$list['turn']][$list['player']][] = $list['card']['name'];
}
}

Answer 1

Try this:
$result = [];
foreach ($data['history']['legend'] as $list) {
$result[$list['turn']-1][$list['player']][] = $list['card']['name'];
}
Fiddle it! http://ideone.com/BtKOKJ

Answer 2

You can just start adding data to the new array. PHP is extremely forgiving.
$historyByTurns = array();
foreach ($arr['history'] as $historyItem) {
foreach ($historyItem['legend'] as $legendItem) {
$turn = $legendItem['turn'];
$player = $legendItem['player'];
if (!array_key_exists($turn, $historyByTurns)) {
$historyByTurns[$turn] = array();
}
if (!array_key_exists($player, $historyByTurns[$turn])) {
$historyByTurns[$turn][$player] = array();
}
foreach ($legendItem as $card) {
$historyByTurns[$turn][$player][] = $card['name'];
}
}
}
You will have to test it, as I have no way to do that ATM.