What potential issue is the user facing with their PHP code?

The user is facing a potential issue with their PHP code due to not properly escaping user input before using it in a SQL query, which can lead to SQL injection attacks. To solve this issue, the user should use prepared statements or parameterized queries to securely interact with the database. 

// Using prepared statements to securely interact with the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->execute(['username' => $_POST['username']]);
$user = $stmt->fetch();

Keywords

syntax error undefined variable missing semicolon parse error function not found

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