Trying to store/retrieve/display Unicode emoji in a MySQL database

emoji.php

<?php

// MySQL schema
/*
CREATE TABLE `test` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `text` text,
  `blob` blob,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
*/

// tell the browser we're going to be using Unicode characters
header('Content-type text/html; charset=UTF-8');

$db = new mysqli('localhost', 'test', 'test', 'test');

// http://stackoverflow.com/a/2446818/294171 -- makes no difference on my system
$db->query("SET character_set_client='utf8'");
$db->query("SET character_set_results='utf8'");
$db->query("set collation_connection='utf8_general_ci'");

$statement = $db->prepare("INSERT INTO `test` (`text`) VALUES (?)");
$emoji = '😀';
$statement->bind_param('s', $emoji);
$statement->execute();

echo "inserted $emoji";

?>