First off: Assigning '' to $uid here is both mildly confusing of the issue, and redundant. The reason is that my $uid; will implicitly set $uid to undef, which is false.

However, that's not the problem, as far as I can see. There's two possiblities. The first is that $entry->get($_) might not return the same thing all three times you call it. Presumably, you'd know if this were a possiblity, so I won't talk much about it. The second possiblity is that it returns somthing that isn't an array reference, but is true.

I'd do this somthing like this: 

for my $entry ($searchresult->entries) {
   my $uid = $entry->get('uid');
   if (!$uid || !UNIVERSAL::isa($uid, 'ARRAY')) {
     print "*** No uid for the following  entry:\n";
     print Dumper(\$entry);
   }
   $uid = ${$uid}[0];
   if (!$uid) {
     print "*** No uid for the following  entry:\n";
     print Dumper(\$entry);
   }
   for (@vars) {
         $uids{$uid}{$_} = '';
         $uids{$uid}{$_} = ${$uid}[0];
   }
}

[download]

Note that UNIVERSAL::isa($foo, 'ARRAY'); will tell you if $foo is a reference to an array (or if it is a reference to somthing else blessed into a class named ARRAY, which I find terribly unlikely).

Warning: Unless otherwise stated, code is untested. Do not use without understanding. Code is posted in the hopes it is useful, but without warranty. All copyrights are relinquished into the public domain unless otherwise stated. I am not an angel. I am capable of error, and err on a fairly regular basis. If I made a mistake, please let me know (such as by replying to this node).

In reply to Re: About BLOCK variables by theorbtwo
in thread About BLOCK variables by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.