foreach questions

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Hello;
I have this section of code:

 @include('tmp_index.php');
   foreach($index as $key -> $value)
          {
           if($input == $key)
             {
              $target_file = $value;
             }
          }
And I am getting this error:
Fatal error: Cannot access empty property in <path>/confirmation.php on line 131

Several questions:
How long can an index be in an associative array? (the indexes I use in this array are 32 character hashes)
Can it start with a number (since a hash can start with a number)
Can I use $index as an array name? (I do not remember off hand what the reserved key words are)
I am not sure what the "empty property" is that it is referring to.
Thank you in advance for info;
Jeff K

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