When you copy the hash with my %hash = @_; you are making copies of its values, but those values are themselves references. And the copied references refer to the same things that the originals do!
In order to get pass-by-value like behavior¹ with complex structures in Perl, you need to make a "clone" or "deep copy" of your structures. The Storable module can help with that.
1. I say "pass-by-value like behavior" because, regardless, the actual passing to your subs is really by reference. You must make the copy yourself.
"My two cents aren't worth a dime.";
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link
or How to display code and escape characters
are good places to start.