round up issue

roundup issue.php

<?php
	/**
	 * problem solved.
	 * thanks
	 **/
	$spp002 = 1.70;
	$bizhubC360 = 1;
	$InPage = 45;
	$r = ($spp002 + $bizhubC360) / $InPage;
	
	//echo $r. test result shows 0.06
	echo '$r = ' . $r;
	echo PHP_EOL;
	
	$r =(float)sprintf('%.11f' ,$r);
	var_dump($r);
	echo '$r = ' . $r;
	echo PHP_EOL;
	
	//test1, using variable $r
	//output shows 0.07, expected output suppose to be 0.06
	echo round_up($r,2);
	echo PHP_EOL;
	
	//test2, enter the $r value, 0.06
	//output shows 0.06, which is as expected 
	echo round_up(0.06,2);
	echo PHP_EOL;

	function round_up($value, $places) 
	{
		$mult = pow(10, abs($places)); 
		return $places < 0 ? ceil($value / $mult) * $mult : ceil($value * $mult) / $mult;
	}