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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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14 Comments

LVL 65

Expert Comment

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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LVL 36

Author Comment

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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LVL 65

Expert Comment

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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LVL 65

Expert Comment

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

floor(  (your number / 10) ) * 10

0

LVL 65

Expert Comment

ID: 33722361
and for rounding up try this

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

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LVL 36

Author Comment

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
0

LVL 36

Author Comment

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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LVL 65

Expert Comment

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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LVL 36

Author Comment

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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LVL 65

Accepted Solution

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

0

LVL 31

Assisted Solution

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 />";
?>
``````
0

LVL 12

Expert Comment

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

echo \$rnd;
``````
0

LVL 1

Expert Comment

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));

?>
0

LVL 31

Expert Comment

ID: 33760307
Thanks for points! Bye
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