HH\Pair::keys

Returns an ImmVector with the values being the keys of the current Pair

public function keys(): ImmVector<int>;

This method will return an ImmVector with keys 0 and 1, and values 0 and 1, since the keys of a Pair are 0 and 1.

Returns

• ImmVector<int> - an ImmVector containing the integer keys of the current Pair as values.

Examples

$p = Pair {'foo', -1.5};
var_dump($p->keys());

object(HH\ImmVector)#2 (2) {
  [0]=>
  int(0)
  [1]=>
  int(1)
}