Adding a new sub-element to multi-dimensional array based on a condition in PHP

Question

I can achieve this easily enough with loops, but it seems messy and I wondered if there's something that could be done with array_map or similar?

Given the following array:

[1]=>
array(3) {
  ["foo"]=>
  int(25)
  ["bar"]=>
  int(100)
  ["total"]=>
  int(125)
}
[2]=>
array(3) {
  ["foo"]=>
  int(11)
  ["bar"]=>
  int(38)
  ["total"]=>
  int(49)
}
[3]=>
array(3) {
  ["foo"]=>
  int(20)
  ["bar"]=>
  int(100)
  ["total"]=>
  int(120)
}

How would you go about flagging the index with the lowest total?

e.g. to change it to:

[1]=>
array(3) {
  ["foo"]=>
  int(25)
  ["bar"]=>
  int(100)
  ["total"]=>
  int(125)
}
[2]=>
array(4) {
  ["foo"]=>
  int(11)
  ["bar"]=>
  int(38)
  ["total"]=>
  int(49)
  ["lowest"]=>
  bool(true)
}
[3]=>
array(3) {
  ["foo"]=>
  int(20)
  ["bar"]=>
  int(100)
  ["total"]=>
  int(120)
}

(adding "lowest" => false to the other indexes is unnecessary but acceptable)

Many thanks, I can't get my head around it. My brain seems to be failing me, it's been a long day.

loops will be involved no matter what

user6763587
– user6763587

2016-09-21 22:12:20 +00:00
Commented Sep 21, 2016 at 22:12 — user6763587
– user6763587, Commented Sep 21, 2016 at 22:12

Alexey Chuhrov · Accepted Answer · 2016-09-21 22:33:43Z

3

Using array_column() we can retrieve subarray. Then using min() find the lowest value and find corresponding key using array_search():

$total = array_combine(array_keys($array), array_column($array, 'total'));
$minKey = array_search(min($total), $total);
$array[$minKey]['lowest'] = true;

To preserve original keys here's also combination of array_keys() and array_combine()

edited Sep 21, 2016 at 22:33

answered Sep 21, 2016 at 22:14

Alexey Chuhrov

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2 Comments

AbraCadaver Over a year ago

Except array_column() will return a 0 based array. So the search will return index 1 but in the original array the minimum is at index 2.

Codemonkey Over a year ago

Thanks! To my eye it's not super obvious code so I'll probably stick with a loop as at least that's easy to read/understand, but I learnt something here :)

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