Untitled

<?php
session_start();
$host = 'localhost';
$password = '';
$user = 'root';
$dbName = 'super';
$charset='utf-8';
$dsn = sprintf('host=%s;dbname=%s;charset=%s;',$host,$dbName,$charset);

$result = 'No';
$currentWord = '';
if(!isset($_SESSION['word'])){
    $db = new PDO($dsn,$user,$password);
    $db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
    $sql = "SELECT * FROM test1 ORDER BY RAND() LIMIT 1";
    $statement = $db->query($sql);
    $statement->execute();
    $row = $statement->fetch(PDO::FETCH_OBJ);
    $_SESSION['word'] = $row->word;
}

if(isset($_POST['word']) && $_POST['word'] === $_SESSION['word']){
    $result = 'Yes';
    $currentWord = $_POST['word'];
    unset($_SESSION['word']);
    session_regenerate_id(true);
}
header('Content-Type:text/html;charset=utf-8');
?>
<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8"/>
</head>
<body>
<form method="post">
    <fieldset>
        <legend></legend>
        <label for="word1"></label>
        <input type="text" id="word1" name="word1" value="<?= $currentWord ?>" /><br />
    </fieldset>
    <input type="submit" value="Yes" name="submit" />
</form>
</body>
</html>