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>
- anImmVector
containing the integer keys of the currentPair
as values.
Examples
$p = Pair {'foo', -1.5};
var_dump($p->keys());
object(HH\ImmVector)#2 (2) {
[0]=>
int(0)
[1]=>
int(1)
}