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The issue here is two-fold.

#Problem 1

The filesize function returns a signed integer, with a maximum value of PHP_INT_MAX. On 32-bit PHP, this value is 2147483647 or about 2GB. On 64-bit PHP can you go higher, up to 9223372036854775807. Based on the comments from the PHP filesize page, I created a function that will use a fseek loop to find the size of the file, and return it as a float, which can count higher that a 32-bit unisgned integer.

function filesize_float($filename)
{
 $f = fopen($filename, 'r');
 $p = 0;
 $b = 1073741824;
 fseek($f, 0, SEEK_SET);
 while($b > 1)
 {
 fseek($f, $b, SEEK_CUR);
 if(fgetc($f) === false)
 {
 fseek($f, -$b, SEEK_CUR);
 $b = (int)($b / 2);
 }
 else
 {
 fseek($f, -1, SEEK_CUR);
 $p += $b;
 }
 }
 while(fgetc($f) !== false)
 {
 ++$p;
 }
 fclose($f);
 return $p;
}

To get the file size of the file as a float using the above function, you would call it like this.

$filesize = filesize_float($file);

#Problem 2

Using %u in the sprintf function will cause it to interpret the argument will cause it to interpret the value as an unsigned integer, then limiting the maximum possible value to 4294967295 on 32-bit PHP, before overflowing. Therefore, if we were to do the following, it would return the wrong number.

sprintf("%u", filesize_float($file));

You could interpret the value as a float using %F, using the following, but it will result in trailing decimals.

sprintf("%F", filesize_float($file));

For example, the above will return something like 6442450944.000000, rather than 6442450944.

A workaround would be to have sprintf interpret the float as a string, and let PHP cast the float to a string.

$filesize = sprintf("%s", filesize_float($file));

This will set $filesize to the value of something like 6442450944, without trailing decimals.

#The Final Solution

If you add the filesize_float function above to your code, you can simply use the following line of code to read the actual file size into the sprintf statement.

$filesize = sprintf("%s", filesize_float($file));