# Introduction

For arbitrary precision mathematics PHP offers BCMath which supports numbers of any size and precision up to `2147483647` (or `0x7FFFFFFF`) decimals, if there is sufficient memory, represented as strings.

Caution

Passing values of type float to a BCMath function which expects a string as operand may not have the desired effect due to the way PHP converts float values to string, namely that the string may be in exponential notation (which is not supported by BCMath), and that the decimal separator is locale dependent (while BCMath always expects a decimal point).

`<?php
$num1 = 0; // (string) 0 => '0'
$num2 = -0.000005; // (string) -0.000005 => '-5.05E-6'
echo bcadd($num1, $num2, 6); // => '0.000000'
setlocale(LC_NUMERIC, 'de_DE'); // uses a decimal comma
$num2 = 1.2; // (string) 1.2 => '1,2'
echo bcsub($num1, $num2, 1); // => '0.0'
?>`