What steps can be taken to refactor or rewrite a PHP script to improve its functionality and security, considering the outdated code in the forum thread?

The outdated PHP script in the forum thread is vulnerable to SQL injection attacks due to the use of outdated mysql functions. To improve functionality and security, the script should be refactored to use PDO or MySQLi prepared statements for database queries. Additionally, input validation and sanitization should be implemented to prevent malicious user input. 

// Connect to the database using PDO
$pdo = new PDO('mysql:host=localhost;dbname=database', 'username', 'password');

// Prepare a SQL statement with placeholders
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the parameter and execute the statement
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);

// Loop through the results and output them
foreach ($results as $row) {
    echo $row['username'] . '<br>';
}

Keywords

refactor rewrite PHP script functionality security

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