bcmod

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

bcmod Ricava il modulo di un numero a precisione arbitraria

Descrizione

bcmod(string $operando, string $modulo): string

Ricava il modulo di operando usando modulo.

Esempi

Example #1 esempio di bcmod()

<?php
echo bcmod(4, 2); // 0
echo bcmod(2, 4); // 2
?>

Vedere anche:

bcdiv().

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User Contributed Notes 2 notes

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5
lauris at night dot lt
20 years ago
<?php
/**
* 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
    {
       
$a = (int)$mod.substr( $x, 0, $take );
       
$x = substr( $x, $take );
       
$mod = $a % $y;   
    }
    while (
strlen($x) );

    return (int)
$mod;
}

// example
echo my_bcmod( "7044060001970316212900", 150 );
?>
up
1
drahoszdenek at gmail dot com
11 years ago
The modulus can be only integer. For "floats" bcmod returns 0:

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

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

<?php
$eval
= new \BN\Expression\ExpressionEvaluator();
$operators = new \BN\Expression\OperatorsFactory();
$eval->setOperators($operators->getOperators(array('%')));
       
echo
$eval->evaluate('10 % 2.1'); // 1.6
echo $eval->evaluate('10 % -2.1'); // 1.6
echo $eval->evaluate('-10 % 2.1'); // -1.6
echo $eval->evaluate('-10 % -2.1'); // -1.6
?>
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