[PHP] Storing key values in an array

[Todd Cary]

I am using an array to populate a drop-down and I would like to have the 
same value in the key as the value.  Using the following, the key is 
0,1,2,3...etc.  How can I correct that?

    $file_list = array();
    $dir = opendir($doc_dir);
    while (false !== ($file = readdir($dir))) {
      if (($file != ".") && ($file != ".."))
        $file_list[$file] = $file;  <---------------<<<<<
    }
Todd
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