在php中下载csv错误

I have a address column(with , and .) in my table, when i download table using php it will not coming in proper manner here is my code

my address column data is like 'Plot No: 34, Krishna Mahalaxmi Nagar, XXX, Beside XXXX XXXX, XXXXX.'

foreach ($stmt1 as $row) {
  if (!$flag) {
      echo implode("\t", array_keys($row)) . "
";
      $flag = true;
  }
  foreach ($row as $k => $v) {
      if ($k == 'id') {
          $row[$k] = $count;
      }
      if ($k == 'previous_school') {
          $row[$k] = str_replace('/[ ,]+/', ' ', trim($v));;
      }
      if ($k == 'address') {
          $row[$k] = str_replace('/[ ,]+/', ' ', trim($v));;
      }
  }
  echo implode("\t", array_values($row)) . "
";
  $count++;
}

Please click link for image

Try this

$row[$k] = str_replace(' ,', ' ', trim($v));

or

$row[$k] = preg_replace('/[ ,]+/', ' ', trim($v));