What are potential pitfalls when working with PHP variables and database tables in web development projects?

One potential pitfall when working with PHP variables and database tables in web development projects is SQL injection attacks. To prevent this, it is important to use prepared statements with parameterized queries when interacting with the database. This helps sanitize user input and prevent malicious SQL code from being executed. 

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

Keywords

SQL injection data validation prepared statements PDO variable scope

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