bcmod

(PHP 4, PHP 5)

bcmod Ricava il modulo di un numero a precisione arbitraria

Descrizione

string bcmod ( string $operando , string $modulo )

Ricava il modulo di operando usando modulo.

Esempi

Example #1 esempio di bcmod()

<?php
echo bcmod(42); // 0
echo bcmod(24); // 2
?>

Vedere anche:

bcdiv().

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User Contributed Notes 4 notes

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4
lauris at night dot lt
10 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 );
?>
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2
drahoszdenek at gmail dot com
1 year 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 $eval->evaluate('-10 % -2.1'); // -1.6
?>
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0
sebas at stageprikbord dot nl
7 years ago
function bc_is_even($int_str) {
  return (int)!($int_str & 1);
}

More resource efficient version of 'bc_is_even'.
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-2
admin at deosnet dot com
1 year ago
This function is also equivalent to :

<?php
   
echo 4%2; // 0
   
echo 2%4; // 2
?>
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