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Array element navigation

<? $major_city_info = array(); $major_city_info[0] = 'A'; $major_city_info['A'] = 'B'; $major_city_info[1] = 'C'; $major_city_info['C'] = 'D'; $major_city_info[2] = 'E'; $major_city_info['E'] = 'F'; function print_all_array($city_array) {     $current_item = current($city_array);   if ($current_item)     print("$current_item<BR>");   else     print("There's nothing to print");   while($current_item = next($city_array))     print("$current_item<BR>"); } print_all_array($major_city_info); print_all_array($major_city_info);// again, to see what happens ?>