Analogue of the % operator in PHP?

Question

PHP

In JavaScript, the operation 4.2 % 2returns any remainder of the division, which is 0.2 in this example.
In PHP - exclusively integer: 5.5 % 2 //1
How to get a fractional remainder of a division in PHP?

Answer 1

fmod

Answer 2

What's the problem with writing your bike?

function modulus($a, $b) {
    return ($a - $b * floor($a / $b));
}