Hướng dẫn dùng php bcmod trong PHP

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

bcmod — Get modulus of an arbitrary precision number

Description

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

Parameters

The dividend, as a string.

The divisor, as a string.

Return Values

Returns the modulus as a string, or null if num2 is 0.

Changelog

Examples

Example #1 bcmod() example

bcscale(0);
echo bcmod( '5',  '3'); //  2
echo bcmod( '5', '-3'); //  2
echo bcmod('-5',  '3'); // -2
echo bcmod('-5', '-3'); // -2
?>

Example #2 bcmod() with decimals

bcscale(1);
echo bcmod('5.7', '1.3'); // 0.5 as of PHP 7.2.0; 0 previously
?>

See Also

• bcdiv() - Divide two arbitrary precision numbers

lauris at night dot lt ¶

18 years ago

/**
* my_bcmod - get modulus (substitute for bcmod)
* string my_bcmod ( string left_operand, int modulus )
* left_operand can be really big, but be carefull with modulus :(
* by Andrius Baranauskas and Laurynas Butkus :) Vilnius, Lithuania
**/
function my_bcmod( $x, $y )
{
    // how many numbers to take at once? carefull not to exceed (int)
    $take = 5;    
    $mod = '';

    do
    {

drahoszdenek at gmail dot com ¶

9 years ago

The modulus can be only integer. For "floats" bcmod returns 0:

echo bcmod('10', '2.1'); // 0
?>

For real modulus you can use BN-PHP project (hosted at Bitbucket):

$eval = new \BN\Expression\ExpressionEvaluator();
$operators = new \BN\Expression\OperatorsFactory();
$eval->setOperators($operators->getOperators(array('%')));

        echo