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

down

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 );

?>

down

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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