Fix for This code will extract files form a zip file uploaded via a specific FileField

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<?php
function my_unzip_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
  if ($node->type == 'test') {
    dsm($node);
    switch ($op) {
      case 'update':
        if (!is_null($node->field_zipfile[0])) {
          dsm('a zip file is atttached.');
          my_unzip_unzip($node);
        }
        else {
          dsm('No zip file is attached.');
        }
        break;
    } // /switch ($op)
  }
}

function deleteDirectory($dir) {
  if (!file_exists($dir)) return true;
  if (!is_dir($dir)) return unlink($dir);
  foreach (scandir($dir) as $item) {
    if ($item == '.' || $item == '..') continue;
    if (!deleteDirectory($dir.DIRECTORY_SEPARATOR.$item)) return false;
  }
  return rmdir($dir);
}

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Fix for This code will extract files form a zip file uploaded via a specific FileField