bcmod

<?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 );
?>

The modulus can be only integer. For "floats" bcmod returns 0:<?phpecho 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'); // 1.6echo $eval->evaluate('10 % -2.1'); // 1.6echo $eval->evaluate('-10 % 2.1'); // -1.6echo $eval->evaluate('-10 % -2.1'); // -1.6?>