How can PHP scripts be modernized and updated to handle numeric values more effectively in older projects?

To modernize and update PHP scripts to handle numeric values more effectively in older projects, you can start by replacing any deprecated functions or methods with newer alternatives that offer better performance and security. Additionally, consider using type declarations to explicitly define the data types of numeric values, which can help prevent unexpected behaviors or errors in your code. Lastly, make use of modern PHP features like the null coalescing operator (??) or the spaceship operator (<=>) to simplify and improve the readability of your numeric value manipulation logic.

// Before modernization
$sum = $num1 + $num2;
```

```php
// After modernization
$sum = (int)$num1 + (int)$num2;