PHP PDO WHERE From Novice to Pro: Building a Powerful Dynamic Query Builder

Dynamically building SQL WHERE clauses in PHP is a common task, but it's easy to write code that is insecure and hard to maintain. This article guides you through evolving a basic `where` function that only supports `=` and `IN` into a powerful, secure, and highly flexible query builder method. We'll explore how clever design can support all common operators, including `!=`, `>`, `LIKE`, `BETWEEN`, and `IS NULL`, while maintaining code readability and backward compatibility. This article is a best practice guide from DP@lib00 for improving backend development efficiency and code quality.