What potential issue is the user experiencing with the script's functionality?

The user is experiencing an issue where the script is not properly sanitizing user input, leaving it vulnerable to SQL injection attacks. To solve this issue, the user should use prepared statements with parameterized queries to securely interact with the database. 

// Issue: SQL injection vulnerability due to lack of input sanitization
// Solution: Use prepared statements with parameterized queries

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

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

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

// Execute the query
$stmt->execute();

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

// Use the results as needed
foreach ($results as $row) {
    // Process the data
}

Keywords

syntax error undefined variable function not found database connection error incorrect data type

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