bccomp
(PHP 4, PHP 5)
bccomp — Compare two arbitrary precision numbers
Описание
int bccomp
( string $left_operand
, string $right_operand
[, int $scale
] )
Compares the left_operand to the right_operand and returns the result as an integer.
Список параметров
- left_operand
-
The left operand, as a string.
- right_operand
-
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.
Возвращаемые значения
Returns 0 if the two operands are equal, 1 if the left_operand is larger than the right_operand , -1 otherwise.
Примеры
Пример #1 bccomp() example
<?php
echo bccomp('1', '2') . "\n"; // -1
echo bccomp('1.00001', '1', 3); // 0
echo bccomp('1.00001', '1', 5); // 1
?>
Коментарии
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;
}
?>
Beware that negative zero does not compare equal to positive zero.BEWARE! left and right operand is string!! so number in E-notation like 9.012E-6 need to be converted with sprintf('%F') to stringIf 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