This API is part of the Hack Standard Library, not HHVM itself.

Returns a new dict where each mapping is defined by the given key/value tuples

namespace HH\Lib\Dict;

function from_entries<Tk as arraykey, Tv>(
    Traversable<(Tk,Tv)> $entries,
): dict<Tk, Tv>;

In the case of duplicate keys, later values will overwrite the previous ones.

Also known as unzip or fromItems in other implementations.