Adapting excel OKRWNOW to FLOOR php?

Question

PHP

Can you please tell me how to implement the Excel formula OKRVNIZ (with rounding down to the nearest integer multiple of a certain factor) in php? The crux of the matter is that in the OKVDOWN the specified multiplier will be a multiple of the rounding result, but how to do this in php?
Thank you.

Answer 1

function floorLikeInExcel($number, $significance) {
  return $number - fmod($number, $significance);
}

https://ideone.com/1FsnOD
But the third example is not the same as in Excel, in which case it gives #NUM!
an additional check.