Here are some of the key pros and cons of each:

MySQLi Extension:

Pros:

Supports both procedural and object-oriented programming styles.
Faster than PDO for simple queries, since it is specifically designed for MySQL.
Provides better security features, such as prepared statements and parameterized queries.
Offers better debugging capabilities with error codes and messages.
Cons:

Limited support for other database systems, as it is designed specifically for MySQL.
Steeper learning curve for beginners due to its multiple programming styles.
May require more complex code for some operations, such as error handling and result set manipulation.
PHP Data Objects (PDO):

Pros:

Provides a consistent interface for working with different database systems, including MySQL, SQLite, PostgreSQL, and others.
Supports both procedural and object-oriented programming styles.
Offers better error handling and exception support.
Offers better code reusability and maintainability.
Cons:

Slower than MySQLi for simple queries, since it is not specifically designed for MySQL.
Requires more code for some operations, such as prepared statements and transactions.
May have compatibility issues with certain MySQL features, such as stored procedures and user-defined functions.
Overall, the choice between MySQLi and PDO will depend on your specific needs and preferences. If you are working primarily with MySQL and want faster performance and stronger security features, MySQLi may be the better choice. If you need to work with multiple database systems or prioritize code reusability and maintainability, PDO may be a better fit.
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