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How can I round up and down in PHP?

Posted on 2010-09-20
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Last Modified: 2013-11-13
for example if i have values like these, and i need to round it,

if i have value,  2134.21 ==> Round up to 2130
if i have value,  4435.65 ==> Round up to 4439

if i have value 385 ==> Round up to 389
if i have value 382 ==> Round up to 380

How can I do it?
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Question by:Loganathan Natarajan
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Expert Comment

by:rockiroads
ID: 33722252
have a look at floor and ceil functions

ceil - round up
floor - round down

or maybe specify the round type as described here http://php.net/manual/en/function.round.php
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Author Comment

by:Loganathan Natarajan
ID: 33722304
i tried that function , it does not give me the exact value i want it.. Can you give me example?
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Expert Comment

by:rockiroads
ID: 33722340
Actually just looked again closely at your sample data. When u round up you want it to the next 9? and rounded down to 0?



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Expert Comment

by:rockiroads
ID: 33722357
to round down, can u try this formula

floor(  (your number / 10) ) * 10

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Expert Comment

by:rockiroads
ID: 33722361
and for rounding up try this


 (  ceil(  (your number / 10) ) * 10 ) - 1

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Author Comment

by:Loganathan Natarajan
ID: 33722496
both are not returning what i expect the values,

echo "value 1 - ".floor( ($num / 10) ) * 10

echo "value 2".ceil(($num / 10) ) * 10 ) - 1
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Author Comment

by:Loganathan Natarajan
ID: 33722498
>> Actually just looked again closely at your sample data. When u round up you want it to the next 9? and rounded down to 0?


correct...

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Expert Comment

by:rockiroads
ID: 33722551
give me an example of what is not working. I tried what u posted up and it seemed fine.
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Author Comment

by:Loganathan Natarajan
ID: 33722568

$num = 4435.65;

echo "value 1 - ".floor( ($num / 10) ) * 10

echo "value 2".ceil(($num / 10) ) * 10 ) - 1

---------

i expect values $num = 4439, 4430
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Accepted Solution

by:
rockiroads earned 200 total points
ID: 33722573
2134.21 ==> 2130   running this floor((2134.21 / 10) ) * 10  produces 2130

4435.65 ==> 4439   running this  (ceil((4435.65 / 10) ) * 10 ) - 1 produces 4439


385 ==> 389    running this  (ceil((385 / 10) ) * 10 ) - 1 produces 389
382 ==> 380    running this floor((382 / 10) ) * 10 produces 380

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Assisted Solution

by:Marco Gasi
Marco Gasi earned 50 total points
ID: 33722578
Try code attached: it does the trick.

Cheers.
<?php
/*
if i have value,  2134.21 ==> Round up to 2130
if i have value,  4435.65 ==> Round up to 4439

if i have value 385 ==> Round up to 389
if i have value 382 ==> Round up to 380
*/
function myround($n){
    $temp = explode(".", $n);
    $intnum = $temp[0];
    $lastnum = substr($intnum, strlen($intnum)-1, 1);
    if ($lastnum < 5){
        $lastnum = 0;
    }else{
        $lastnum = 9;
    }
//    return $lastnum;
    return str_replace(substr($intnum, strlen($intnum)-1, 1), $lastnum, $intnum);
}

$n1 = 2134.21;
$n2 = 4435.65;
$n3 = 385;
$n4 = 382;


echo myround($n1);
echo "<br />";
echo myround($n2);
echo "<br />";
echo myround($n3);
echo "<br />";
echo myround($n4);
echo "<br />";
?>

Open in new window

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Expert Comment

by:Rok-Kralj
ID: 33722728
Can be done simpler:
$num = 4431.65;
$rnd = round($num/10)*10;
if ($num<$rnd) $rnd--;

echo $rnd;

Open in new window

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Expert Comment

by:ashokadi
ID: 33728011
<?
/*


try this you can get the solution
2134.21;

4435.65;

385 ;
*/

$numa = 4435.65 ;
printf(" <br> %d <br>",($numa%10)?((($numa%10)<5)?(10*(int)($numa/10)):((10*(int)($numa/10))+9)):($numa));

?>
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Expert Comment

by:Marco Gasi
ID: 33760307
Thanks for points! Bye
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