i have two functions, only difference is the how parameter is assigned "my $data = @_ vs. my ($data) = @_" (for me, they are same), i don't know why test1 gives the correct result, but test2 doesn't, it always prints out the size of the parameters. 

sub test1 {
    my ($data) = @_;
    print "test1 data = $data\n";
}

sub test2 {
    my $data = @_;
    print "test2 data = $data\n";
}


test1("hello");
test2("hello");
test2( qw(hello world) );


OUTPUT:
test1 data = hello
test2 data = 1
test2 data = 2

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In reply to function parameter assignment question by perlfan99

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