Hack
HHVM
报告 bug 或提出建议。
搜索文档
Documentation
Hack
Reference
Interface
ConstSet
firstValue
ConstSet::firstValue
Returns the first value in the current
ConstSet
public function firstValue(): ?Tv;
Returns
?Tv
- The first value in the current
ConstSet
, or
null
if the
ConstSet
is empty.