# Math in PHP

- How to count the number of characters in a multi-byte string using PHP.
- Lean to find the common multiples between two numbers in PHP; the tutorial starts by teaching you about multiples, then moves on to common multiples.
- This tutorial shows how to check if a number is a decimal number using the PHP floor function.
- Why the caret character is not working in exponential growth calculations in PHP, and what to use instead.