php - Undefined Offset 1 on fgetcsv -

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the following url contains tab-separated table of data particular day. 1 below january 4, 2011.

http://lpo.dt.navy.mil/data/dm/2011/2011_01_04/air_temp

i wrote script go through entire date range of 2010-06-01 today, grabbing date , air temperature value , insert database. amount of data kept causing timeout weird miracle able in 2014-03-27. here's script used (probably not elegant solution i'm staring out). 

 public function requestdata(){      $year = 2014;      $startdate = new datetime('2014-03-28');     $enddate = new datetime('2014-05-05');     $incrementday = new dateinterval('p1d');        while ($startdate <= $enddate)      {         $results = [];         $startdateformat = $startdate->format('y-m-d'); //format datetime object         $startdateurl = str_replace( "-", "_", $startdateformat); //prep date url entry         $dayofyear = date("z", strtotime($startdateformat)); //store day of year          if ($dayofyear == '0') //if day of year 0, increment year 1             {                 $year++;             }           $url = 'http://lpo.dt.navy.mil/data/dm/' . $year . '/' . $startdateurl . '/air_temp';         $url_header = @get_headers($url);            //if url found, open url, if not found set empty         $file = ($url_header[0] == 'http/1.1 200 ok') ? fopen($url, 'r') : "empty";          //if file not found, skip iteration of loop, increment day , return top of loop         if ($file == "empty")              {                  $startdate->add($incrementday);                 continue;              }           while (($line = fgetcsv($file, 500, "\t")) !== false)             {                 $dataarray = explode("  ", $line[0]);                 $date = substr($dataarray[0], 0, 10);                   $moddate = str_replace("_", "-", $date);                 // var_dump($dataarray);                 $results[$moddate]['air'][] = $dataarray[1];             }           fclose($file);           foreach ($results $date => $subdata)              {                 db::table('weatherdata')->insert(array('date' => $date));                 db::table('weatherdata')->where('date', $date)->update(array('air_temp' => implode(",", $subdata['air'])));               }            $startdate->add($incrementday);

i able upload data before, it's giving me undefined offset error , i'm not sure why. var_dumped $dataarray , dumps out each array this:

array (size=2)   0 => string '2014_03_28 13:14:57' (length=19)   1 => string '38.4' (length=4) array (size=2)   0 => string '2014_03_28 13:15:57' (length=19)   1 => string '38.4' (length=4) ...and on , forth

it seems defined, i'm not sure why i'm getting error. appreciated.


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