<?PHP
  namespace Chirp;

  // Original PHP code by Chirp Internet: www.chirpinternet.eu
  // Please acknowledge use of this code by including this header.

  $data = array(
    array("firstname" => "Mary", "lastname" => "Johnson", "age" => 25),
    array("firstname" => "Amanda", "lastname" => "Miller", "age" => 18),
    array("firstname" => "James", "lastname" => "Brown", "age" => 31),
    array("firstname" => "Patricia", "lastname" => "Williams", "age" => 7),
    array("firstname" => "Michael", "lastname" => "Davis", "age" => 43),
    array("firstname" => "Sarah", "lastname" => "Miller", "age" => 24),
    array("firstname" => "Patrick", "lastname" => "Miller", "age" => 27)
  );

  $colnames = array(
    'firstname' => "First name",
    'lastname' => "Last name",
    'age' => "Age",
  );

  function map_colnames($input)
  {
    global $colnames;
    return isset($colnames[$input]) ? $colnames[$input] : $input;
  }

  function cleanData(&$str)
  {
    if($str == 't') $str = 'TRUE';
    if($str == 'f') $str = 'FALSE';
    if(preg_match("/^0/", $str) || preg_match("/^\+?\d{8,}$/", $str) || preg_match("/^\d{4}.\d{1,2}.\d{1,2}/", $str)) {
      $str = "'$str";
    }
    if(strstr($str, '"')) {
      $str = '"' . str_replace('"', '""', $str) . '"';
    }
  }

  // filename for download
  $filename = "website_data_" . date('Ymd') . ".csv";

  header("Content-Disposition: attachment; filename=\"$filename\"");
  header("Content-Type: text/csv");

  $out = fopen("php://output", 'w');

  $flag = FALSE;

  foreach($data as $row) {
    array_walk($row, __NAMESPACE__ . '\cleanData');
    if(!$flag) {
      // display field/column names as first row
      $firstline = array_map(__NAMESPACE__ . '\map_colnames', array_keys($row));
      fputcsv($out, $firstline, escape: "");
      $flag = TRUE;
    }
    fputcsv($out, array_values($row), escape: "");
  }

  fclose($out);

  exit;