How Do I Effectively Migrate from MySQL to MySQLi in PHP?

Migrating from MySQL to MySQLi

When transitioning from the MySQL extension to the MySQLi extension, it may seem as if simply changing mysql_query($sql); to mysqli_query($sql); would suffice. However, a more comprehensive approach is necessary.

Procedural API

To begin, replace all mysql_* function calls with their equivalent mysqli_* counterparts. Refer to the MySQLi Extension Function Summary for guidance. For example:

mysql_connect -> mysqli_connect
mysql_error -> mysqli_error / mysqli_connect_error
mysql_query -> mysqli_query

Note: Some functions may require slight parameter adjustments.

PHP Version Considerations

The MySQLi extension was introduced in PHP version 5.0. As such, if your PHP version is older than 5.0, you will not be able to use the MySQLi extension and must continue using the MySQL extension.

Additional Considerations

Unlike MySQL, MySQLi allows you to specify the database name as the fourth parameter to mysqli_connect. Alternatively, you can use the mysqli_select_db function if preferred.

Testing and Debugging

Once the migration is complete, execute your updated script and verify its functionality. If errors occur, conduct thorough bug hunting to identify and resolve any inconsistencies.

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