What potential pitfalls should be considered when implementing a review system in PHP, especially when handling multiple versions and database entries?

When implementing a review system in PHP with multiple versions and database entries, a potential pitfall to consider is ensuring data integrity and consistency across versions. One way to address this is by implementing a versioning system for database entries and reviews, ensuring that each review is associated with the correct version of the item being reviewed. 

// Example of implementing a versioning system for reviews in PHP

// Define a function to add a review for a specific version of an item
function addReview($itemId, $version, $reviewText) {
    // Insert the review into the database with the specified version
    $query = "INSERT INTO reviews (item_id, version, review_text) VALUES ('$itemId', '$version', '$reviewText')";
    // Execute the query
}

// Define a function to retrieve reviews for a specific version of an item
function getReviews($itemId, $version) {
    // Retrieve reviews from the database for the specified item and version
    $query = "SELECT * FROM reviews WHERE item_id = '$itemId' AND version = '$version'";
    // Execute the query and return the results
}

Keywords

database normalization version control SQL injection data validation user authentication

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