PHP doesn't treat all the numbers as "numbers.' Instead, it breaks them down into two groups: integers and floating-point numbers. Integers are whole numbers, such as -2, 0, 1234, etc. Floating-point numbers are decimal numbers, such as -1.23, 0.0, 3.14, etc.

Conveniently, most of the time PHP doesn't make you worry about the differences between the two because it automatically converts integers to floating-point numbers and floating-point numbers to integers. It also automatically converts from strings to numbers and ba ck.