Round My number?

Round My number?

I have an number

$n = -5665.36
$round_set = can be : 1,10,10,100,1000

use the $round_set condition to get the $m

if $round_set = 1

  $m = $n

if $round_set = 10

$m = -5660

if $round_set = 100

  $m = -5600

if $round开发者_JAVA百科_set = 1000

  $m = -5000

Anybody know how to round these kind of case?

Use this

intval($m/$round_set) * $round_set

http://codepad.viper-7.com/1EHFWEJ test it here.

<?php
$n = -5665.36;
$round_set = 100;
$precision =  -log10($round_set);
$m = ($round_set == 1 ? $n : round($n, $precision) + $round_set);
echo $m;
?>

Wouldn't something like this work?

function rounded_nb($number, $round_set) {
    return floor($number/$round_set)*$round_set;
}

For any non 0 $round_set ?

You don't need the switch, do

if($round_set > 0) {
  $rounded = $round_set * floor($n / $round_set);
} else {
  $rounded = $n;
}

This should pretty much do.

$rs1 = max(1, $round_set);
$m = $rs1 * floor($n / $rs1);

However a 1,10,100,... valued $round_set might make more sense.

Why not take advantage of PHP's round

$m = round($n, ($round_set == 0 ? 0 : -1 * log10($round_set)) );

Edit: Corrected edge-case of log10(0).

Edit 2: Corrected the precision.