How to extract the keys of an array?

Question

PHP

There is an associative array where the keys are Cyrillic values, and the accompanying values ​​are numbers.

array(288) {
  ["еда"]=>
  int(4)
  ["вода"]=>
  int(4)
  ["энергия"]=>
  int(4)
  ["топливо"]=>
  int(3)
  ["лес"]=>
  int(3)
  ["нефть"]=>
  int(3)
  ["дрова"]=>
  int(3)
  ["руда"]=>
  int(2)
...
}

I'm stupid and can't figure out how to get the first 4 keys from this array. Those. I am interested in 4 words in this example: food, water, energy, fuel. Tried foreach but instead of keys, it gives me their values ​​(numbers).

Answer 1

array keys