What are the potential errors in the PHP script provided in the forum thread?

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

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

$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = mysqli_query($connection, $query);

// Fixed code using prepared statements
$username = $_POST['username'];
$password = $_POST['password'];

$query = "SELECT * FROM users WHERE username=? AND password=?";
$stmt = $connection->prepare($query);
$stmt->bind_param("ss", $username, $password);
$stmt->execute();
$result = $stmt->get_result();

Keywords

syntax error undefined variable missing semicolon incorrect function call fatal error

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