Which of the following is NOT a benefit of using PDO?

When considering the various benefits of using PDO (PHP Data Objects), it becomes evident that the option stating that PDO "only works with MySQL databases" is incorrect in the context of its benefits. PDO is designed as a database abstraction layer that allows developers to interact with multiple database management systems (DBMS) using the same API. This means that it can indeed work with various databases, including MySQL, PostgreSQL, SQLite, Oracle, and others, depending on the specific driver used.

The database abstraction feature enables developers to switch between different database types without needing to change the underlying code significantly, which enhances flexibility and portability. Additionally, the support for prepared statements is a significant advantage of using PDO, as it helps mitigate SQL injection risks and can improve performance for repeated query executions.

Moreover, PDO facilitates the ability to manage multiple connections to different databases at the same time. This concurrent connection capability allows applications to function more robustly in environments that require accessing multiple data sources simultaneously.

Thus, identifying that PDO is not limited to MySQL alone highlights a critical strength of using PDO, reinforcing its role as a versatile and powerful tool for database interactions in PHP applications.