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@ 2018-05-01T14:45:35Z

<?php
$leftOperand = '-0.00000000099999';
$modulus = '-0.00056';
$scale =14;
bcscale($scale);

//echo bcmod($leftOperand, $modulus);
foreach(
    [
        [4,3,1],
        [-4,3,2],
        [-4,-3,1],
        [4,-3,-2],

        [3,4,3],
        [-3,4,1],
        [-3,-4,1],
        [3,-4,-1],
    ]
 as $d) {
    echo "\r\nia $d[0] % $d[1] =".iaBcMod($d[0], $d[1], 0). " vs bcmod=".bcmod($d[0], $d[1])." vs wolfman=".$d[2];
}

function iaBcMod($leftOperand, $modulus, $scale) {
    $frac = bcdiv($leftOperand, $modulus, $scale);
    if( $frac[0] === '-') {
        return bcsub(
            $leftOperand,
            bcmul($modulus, ceil($frac), $scale),
            $scale
        );
    }
    return bcsub(
        $leftOperand,
        bcmul($modulus, floor($frac), $scale),
        $scale
    );
}

Output for git.master, git.master_jit, rfc.property-hooks: ia 4 % 3 =1 vs bcmod=1.00000000000000 vs wolfman=1 ia -4 % 3 =-1 vs bcmod=-1.00000000000000 vs wolfman=2 ia -4 % -3 =-1 vs bcmod=-1.00000000000000 vs wolfman=1 ia 4 % -3 =1 vs bcmod=1.00000000000000 vs wolfman=-2 ia 3 % 4 =3 vs bcmod=3.00000000000000 vs wolfman=3 ia -3 % 4 =-3 vs bcmod=-3.00000000000000 vs wolfman=1 ia -3 % -4 =-3 vs bcmod=-3.00000000000000 vs wolfman=1 ia 3 % -4 =3 vs bcmod=3.00000000000000 vs wolfman=-1

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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