PHP Manual: Compare two arbitrary precision numbers

int bccomp(string $num1, string $num2, intnull $scale = null)

Compares the num1 to the num2 and returns the result as an integer.

num1: The left operand, as a string.
num2: The right operand, as a string.
scale: The optional scale parameter is used to set the number of digits after the decimal place which will be used in the comparison.

Returns 0 if the two operands are equal, 1 if the num1 is larger than the num2, -1 otherwise.

Version	Description
8.0.0	`scale` is now nullable.

Example #1 bccomp example

<?php

echo bccomp('1', '2') . "\n";   // -1
echo bccomp('1.00001', '1', 3); // 0
echo bccomp('1.00001', '1', 5); // 1

?>