DocumentationHackReferenceClassHH\MaptoKeysArray

HH\Map::toKeysArray

Returns an array whose values are the keys of the current Map

public function toKeysArray(): varray<Tk>;

Returns

varray<Tk> - an integer-indexed array containing the keys from the current Map.

Examples

$m = Map {
  'red' => '#ff0000',
  'green' => '#00ff00',
  'blue' => '#0000ff',
  'yellow' => '#ffff00',
};

$keys_array = $m->toKeysArray();

var_dump(is_array($keys_array));
var_dump($keys_array);

Output

bool(true)
array(4) {
  [0]=>
  string(3) "red"
  [1]=>
  string(5) "green"
  [2]=>
  string(4) "blue"
  [3]=>
  string(6) "yellow"
}