HH\Pair::firstKey

Returns the first key in the current Pair

Description

public function firstKey(): int

The return will always be 0 since a Pair only has two keys, 0 and 1.

Return Values

  • int - 0

Examples

<?hh

namespace Hack\UserDocumentation\API\Examples\Pair\FirstKey;

$p = Pair {'foo', -1.5};
var_dump($p->firstKey());
Output
int(0)