Another splice method with two joins, one in a map, and an on-the-fly subroutine.
knoppix@Microknoppix:~$ perl -E '
> @arr = qw{
> name
> John
> number
> 7
> status
> unknown
> };
> $str =
> join q{&},
> map { join q{=}, @$_ }
> sub {
> push @ret, [ splice @_, 0, 2 ] while @_;
> return @ret;
> }->( @arr );
> say $str;'
name=John&number=7&status=unknown
knoppix@Microknoppix:~$
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