Floating Point Numbers in

About Floating Point Numbers

Floating point numbers are used in PHP to represent a subset of real numbers. They start with one or more digits separated by a decimal separator.

<?php

$a = 1.234; 
$b = 1.2e3; 
$c = 7E-10;
$d = 1_234.567; // as of PHP 7.4.0

Common pitfalls

Not all numbers and arithmetic operations can be performed with floating point numbers. Using floating point numbers to represent dollars and cents can often lead to rounding errors.

<?php

$result = 0.1 + 0.2; // => 0.30000000000000004