CODEWITHSUNDEEP
phpstringdigits
JacobTheDev
JacobTheDev

Reputation: 18520

Limiting Number of Digits in PHP

I'm displaying how large a list of files are in a table using PHP. I'd like to display how big they are in megabytes instead of the default bytes. The problem I'm having is that I get extremely long decimals, which is impractical for this purpose.

Here's what I have so far:

print((filesize("../uploads/" . $dirArray[$index])) * .000000953674316 . " MB");

Which correctly converts the value, but changes, for example, 71 B to 6.7710876436E-5 MB.

I think the E-5 thing is like x10^-5 which would probably add up correctly, but is there a way I can cut off how many numbers it goes down to? If it displays as "00.00 MB" that's fine by me, most file are going to be much bigger than this test one.

Upvotes: 1

Views: 1055

Answers (5)

str
str

Reputation: 44969

If you need other units, too, you might use this function I wrote years ago:

<?php
function human_filesize($size, $precision = 2)
{
   $a_size = array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB');
   $count  = count($a_size) - 1;
   $i = 0;
   while ($size / 1024 >= 1 && $count >= $i) {
       $size = $size / 1024;
       $i++;
   }
   return round($size, $precision) . ' ' . $a_size[$i];
}

// =========
// USAGE
// =========

// Output: 34.35 MiB
echo human_filesize(filesize('file.zip'));

// Output: 34 MiB
echo human_filesize(filesize('file.zip'), 0);

// Output: 34.35465 MiB
echo human_filesize(filesize('file.zip'), 5);
?>

Upvotes: 0

fvu
fvu

Reputation: 32953

With good old printf :

printf("%.2f MB",filesize("../uploads/" . $dirArray[$index]) * .000000953674316);

Maybe, because it's a bit clearer what the intention is:

printf("%.2f MB",filesize("../uploads/" . $dirArray[$index]) / (1024 * 1024));

Upvotes: 3

Ernestas Stankevičius
Ernestas Stankevičius

Reputation: 2493

Here is simple nice function: Quick PHP

Upvotes: 0

JJJ
JJJ

Reputation: 33163

number_format() is good, and don't forget that round() can round the number to any precision you want.

Upvotes: 1

&#193;lvaro Gonz&#225;lez
&#193;lvaro Gonz&#225;lez

Reputation: 146390

You can format numbers with the number_format() function.

Edit: the manual page contains a user comment you may like: http://es.php.net/manual/en/function.number-format.php#72969

Upvotes: 6

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