Beware that negative zero does not compare equal to positive zero.
(PHP 4, PHP 5, PHP 7, PHP 8)
bccomp — Compare two arbitrary precision numbers
Compares num1 to num2
and returns the result of the comparison as an integer.
num1The left operand, as a string.
num2The right operand, as a string.
scalenull, it will default to the default scale set with bcscale(),
or fallback to the value of the
bcmath.scale INI directive.
Returns 0 if both operands are equal,
1 if num1 is greater than
num2, -1 otherwise.
This function throws a ValueError in the following cases:
num1 or num2
is not a well-formed BCMath numeric string.
scale is outside the valid range.
| 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
?>BEWARE! left and right operand is string!! so number in E-notation like 9.012E-6 need to be converted with sprintf('%F') to stringImprovement of functions bcmax() and bcmin() originaly written by frank at booksku dot com<?phpfunction bcmax() { $args = func_get_args(); if (count($args)==0) return false; $max = $args[0]; foreach($args as $value) { if (bccomp($value, $max)==1) { $max = $value; } } return $max;}function bcmin() { $args = func_get_args(); if (count($args)==0) return false; $min = $args[0]; foreach($args as $value) { if (bccomp($min, $value)==1) { $min = $value; } } return $min;}?>If you want to compare 2 decimals for equality, bccomp does not works as expected:bccomp("1.000000000000000","0.999999999999999",2)returns 1Instead, usebcsub("1.000000000000000","0.999999999999999",2) == 0