Are there any best practices for ensuring a smooth migration process from PHP 5.x to 8.x?

Migrating from PHP 5.x to 8.x can be challenging due to significant changes in syntax and features. To ensure a smooth migration process, it is recommended to thoroughly review the PHP migration guides, update deprecated functions and features, and test the application extensively after the migration.

// Example code snippet for updating deprecated functions in PHP 5.x to PHP 8.x

// PHP 5.x code using deprecated function mysql_connect
$connection = mysql_connect('localhost', 'username', 'password');

// Updated PHP 8.x code using mysqli extension
$connection = mysqli_connect('localhost', 'username', 'password');