What is the potential issue with the PHP code provided in the forum thread?

The potential issue with the PHP code provided in the forum thread is that it is vulnerable to SQL injection attacks due to directly interpolating user input into the SQL query. To solve this issue, you should use prepared statements with parameterized queries to sanitize the user input and prevent SQL injection attacks. 

// Original code vulnerable to SQL injection
$username = $_POST['username'];
$password = $_POST['password'];

// Vulnerable query
$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";

// Fixed code using prepared statements
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->execute(['username' => $username, 'password' => $password]);

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

Keywords

SQL injection vulnerable code security risk prepared statements input validation

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