What potential pitfalls should be considered when constructing SQL queries in PHP?

One potential pitfall when constructing SQL queries in PHP is SQL injection attacks, where malicious code is inserted into the query string. To prevent this, you should always use prepared statements with parameterized queries to sanitize user input and prevent unauthorized access to your database. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $username);
$stmt->execute();
$results = $stmt->fetchAll();

Keywords

SQL injection prepared statements PDO mysqli error handling

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