PHP Utility Classes: Manipulate and validate values of several types

This package can manipulate and validate values of several types.

It provides several classes that can perform operations on different types of values.

Currently, it can:

- Create an array from a string value using several possible characters as separator strings

- Delete empty values from arrays

- Check if a string is of a valid file name

- Check if a string is a valid file name or page URL that PHP can access

- Determine if a string contains a valid number with a checksum digit calculated using the Luhn algorithm

- Check if a string contains a valid IP address

- Generate a random number with a specific number if digits

- Calculate the percentage value given the partial and total numbers

- Remove white space characters from Unicode strings

- Calculate the time of execution of the current script considering its start time and the current time