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bcmod

(PHP 4, PHP 5, PHP 7)

bcmod — 对一个任意精度数字取模

说明

bcmod ( string $left_operand , string $modulus ) : string

对左操作数使用系数取模

参数

left_operand: 字符串类型的左操作数
modulus: 字符串类型系数

返回值

返回字符串类型取模后结果，如果系数为0则返回null

范例

Example #1 bcmod() example


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

参见

bcdiv() - 2个任意精度的数字除法计算

User Contributed Notes

drahoszdenek at gmail dot com 01-Feb-2013 04:44


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

?>

lauris at night dot lt 23-Dec-2003 08:04


<?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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bcmod

说明

参数

返回值

范例

参见

User Contributed Notes

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