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Subroutines

Calling

Do not use '&' when calling subroutines. Using '&' modifies how the arguments are passed into the subroutine and can cause strange problems.
Use parenthesis when calling user-defined subroutines. Parenthesis are not required when calling core functions.
When calling the open and split builtins, use the three argument variants.

open my $file, "<", "/path/to/file" or die "Error! $@";
close $file;
my ($var1, $var2, $var3) = split /:/, $variable, 3;

my $result = get_data( $param1, $param2 );

Defining

Unpack '@_' first. Then check the variables for definedness.
return explicitly.

sub get_data {
    my ($param1, $param2) = @_;
    if (not defined $param1 or not defined $param2) {
        die "Error: required arguments not found!";
    }
    
    # do some stuff ...
    
    return $value;
}

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