bccomp

(PHP 4, PHP 5, PHP 7, PHP 8)

bccompCompare two arbitrary precision numbers

Опис

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

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

Параметри

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.

Значення, що повертаються

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

Журнал змін

Версія Опис
8.0.0 scale is now nullable.

Приклади

Приклад #1 bccomp() example

<?php

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

?>
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User Contributed Notes 3 notes

up
26
Robert Lozyniak
14 years ago
Beware that negative zero does not compare equal to positive zero.
up
15
aaugrin at gmail dot com
6 years ago
BEWARE! left and right operand is string!! so number in E-notation like 9.012E-6 need to be converted with sprintf('%F') to string
up
-1
m dot kaczanowski at alianet dot pl
15 years ago
Improvement 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;
}
?>
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