What are the common pitfalls or drawbacks of transitioning from mysql to mysqli in PHP?

One common pitfall when transitioning from mysql to mysqli in PHP is not updating the syntax for connecting to the database. In mysqli, the connection syntax is different from mysql, so failing to update this can lead to connection errors. To solve this issue, make sure to use the correct mysqli functions for connecting to the database.

// Incorrect mysql connection syntax
$connection = mysql_connect('localhost', 'username', 'password');

// Correct mysqli connection syntax
$connection = mysqli_connect('localhost', 'username', 'password', 'database_name');