What is the potential issue with the SQL syntax in the PHP code provided?

The potential issue with the SQL syntax in the PHP code provided is the lack of proper escaping for the variables being used in the SQL query. This can make the code vulnerable to SQL injection attacks. To solve this issue, you should use prepared statements with parameterized queries to properly sanitize the input data. 

// Fix for the SQL syntax issue
$stmt = $pdo->prepare("INSERT INTO users (username, password) VALUES (:username, :password)");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

Keywords

SQL injection mysqli_real_escape_string prepared statements PDO syntax error

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