my $proph=@_;

Using an array (here @_) in scalar context returns the number of elements in the array , and is not what you want.

Typical solutions are (use only one of them)

my $proph = shift;   # defaults to @_
my ($proph) = @_;    # list context instead
my $proph = $_[0];   # be explicit about wanting the first element

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See perlintro and perlsub for more details.

Perl 6 - the future is here, just unevenly distributed

In reply to Re: passing variables to a subroutine by moritz
in thread passing variables to a subroutine by AWallBuilder

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