recreating wordpress wp_options

wp_options.php

<?php
// from db
echo "from db\n";
$db_value = 'a:1:{i:0;s:19:"heroku-sendgrid.php";}';

echo $db_value;
echo "\n";
var_dump(unserialize($db_value));
echo "\n";

// recreating...
echo "recreating\n";
$db_option = array(
  0 => "heroku-sendgrid.php"
);

echo serialize($db_option);
echo "\n";
var_dump($db_option);
?>

// from db
a:1:{i:0;s:19:"heroku-sendgrid.php";}
array(1) {
  [0]=>
  string(19) "heroku-sendgrid.php"
}

// recreating
a:1:{i:0;s:19:"heroku-sendgrid.php";}
array(1) {
  [0]=>
  string(19) "heroku-sendgrid.php"
}