$name = "John"; $age = 30; $total = $name + $age;
$name = "John"; $age = 30; $total = $name . strval($age);In this code, we concatenate the string `$name` with the string value of `$age` using the `.` operator. The `strval()` function is used to convert the `$age` integer to a string, which allows us to add the two variables together. Determining the package library for handling "add" errors in PHP would depend on the specific project requirements. However, some commonly used packages for handling errors in PHP include: - Monolog: a popular logging library that allows you to log errors to different channels and formats. - Whoops: a library that provides detailed error information and stack traces for debugging purposes. - Bugsnag: a library that allows you to track and monitor errors in real-time, and provides helpful diagnostic information.