What are some common pitfalls to avoid when working with PHP and MySQL in the context of a comment function like the one described in the forum thread?

One common pitfall to avoid when working with PHP and MySQL in the context of a comment function is SQL injection. To prevent this, it's important to use prepared statements and parameterized queries to sanitize user input before executing SQL queries. 

// Avoid SQL injection by using prepared statements
$stmt = $pdo->prepare("INSERT INTO comments (user_id, post_id, comment) VALUES (?, ?, ?)");
$stmt->execute([$user_id, $post_id, $comment]);

Keywords

SQL injection data validation prepared statements XSS attacks database normalization

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