rounding massive numbers

[taith]

anyone know an easy way to round massive numbers?

 

for example...

echo round(78906898968967.432324);

outputs "7.8906898969E+013"

 

which is so totally unhelpful...

[per1os]

http://us.php.net/round

<?php
echo round(78906898968967.432324, 2);
?>

 

See also:

http://us.php.net/manual/en/function.ceil.php

http://us.php.net/manual/en/function.floor.php

[Psycho]

echo number_format(78906898968967.432324, 0);

[taith]

yes... but the scientific notation is not turnoffable...

 

echo round(78906898968967.432324, 2);

outputs "7.8906898969E+013"

 

i need "78906898968967.43"

[taith]

i've made this... it works... sorta...

 

function realround($string,$decimal=2){
if(!is_numeric($string)) return $string;
$string=explode(".",$string);
if(count($string)==1) return $string[0];
$string[1]='1.'.$string[1];
$string[1]=round($string[1],$decimal);
$string[1]=substr($string[1],2);
return implode(".",$string);
}

 

any better suggestions?

[Psycho]

Um, did you try my suggestion of using number_format()? It worked for me. Since you need two decimal places use this:

 

echo number_format(78906898968967.432324, 2);

[taith]

yes... but that adds ,'s in... i need realnumbers... true, i can remove them easy enough...

 

question comes in... why does round() give scientific notation by default? shouldnt that be a seperate option?

[Psycho]

C'mon partner, don't expect us to do ALL the work for you. If you had taken just 30 seconds to look at the manual for number_format() you would have seen that you can customize the thousands seperator (which also means you can remove it).

 

http://us2.php.net/manual/en/function.number-format.php

 

<?php
echo number_format(78906898968967.432324, 2, '.', '')
// Output would be 78906898968967.44
?>

[taith]

bah... too simple...

 

i still say we should contact php mainframe programmers and have the scientific notation added as an option only... in fact... i think i will :-)

[Psycho]

Uh...no.

 

Round is rounding a number and is returning the value of that number. It is returning the value in the most efficient method. It is not intended for format a number. Unless you are presenting a number on the screen it doesn't matter what format it uses internally. That is where number_format comes in.