In what ways does the design of the HTML form and database table in the provided code example violate best practices, and how can they be improved for better functionality and security?

The design of the HTML form and database table in the provided code example violates best practices by not using prepared statements to prevent SQL injection attacks. To improve functionality and security, you should use prepared statements to safely handle user input and prevent malicious SQL queries. 

// Fix for HTML form:
<form action="submit_form.php" method="post">
    <input type="text" name="username" placeholder="Username">
    <input type="password" name="password" placeholder="Password">
    <button type="submit">Submit</button>
</form>

// Fix for database table:
<?php
// Establish database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Prepare SQL statement with placeholders
$stmt = $conn->prepare("INSERT INTO users (username, password) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $password);

// Set parameters and execute
$username = $_POST['username'];
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);
$stmt->execute();

// Close statement and connection
$stmt->close();
$conn->close();
?>

Keywords

HTML form database table SQL injection prepared statements input validation

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