<?php
function allowed_rounding_error ($number, $expected) {

    //different machines  may give slightly different floating point numbers
    //This assumes that the results will be the same to + or - 1.0E-10.

    $small_number = 1.0e-10;
    $min = $expected - $small_number;
    $max = $expected + $small_number;

    if ($number < $max  && $number > $min ) {
        return true;
    }
    else {
        return false;
    }
}
?>