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
<?php
function 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 1
Instead, use
bcsub("1.000000000000000","0.999999999999999",2) == 0