PHP >2 GB filesize

[^rooker]

[PROBLEM]
PHP does not have unsigned integers.
In the version which I'm using (v5.2.6-1) it the function "filesize()" reports a negative value for files larger than 2GB.

So, my testfile had 3549599744 Bytes (~3.5GB).
The following code would output a negative number (=the signed value of 3549599744):

ouch: -745367552

Code: Select all

<?php
$filesize = filesize($large_file);
if ($filesize <= 0)
{
   printf(
}
else
{
   echo "ok!";
}
?>

[SOLUTION]
Since I'm working on a Debian stable (for production usage), I'm stuck with the current PHP version (and I don't even know if this behavior is changed), I had to find a workaround.

Luckily (or actually, unfortunately), others have the same problem and offered infos about workarounds.

so instead of:

Code: Select all

$filesize = filesize($large_file);

use "%u" to reformat it to an unsigned value (that can even exceed 4GB):

Code: Select all

$filesize += sprintf("%u", @filesize($large_file));

It's a dirty hack, because the value is reformatted to an unsigned value, converted to a string by 'sprintf()' and then forced to a numeric type by the '+=' operator. yikes!

But it works...

[^rooker]

If you want to output the large value, you cannot use:

Code: Select all

printf("Filesize: %d\n", $filesize);

as it will crop the value to the positive maximum of a signed int: 2804232192.

You can however use 'float' and reduce the decimals to zero:

Code: Select all

printf(Filesize: %.0f\n", $filesize);

This can handle values larger than 32bit unsigned int.