Description:
------------
2147483647 or PHP_INT_MAX on the system is the max integer. fseek fails with files over PHP_INT_MAX+2 in size. binary math would resolve the fseek issue internally.

Test script:
---------------
reading a file of 20 gigabytes (or anything larger then PHP_INT_MAX+2) is successful with:

<?php

 $handle = fopen('20gbfile', 'r');
 while (!feof($handle)) {
  echo fread($handle, PHP_INT_MAX);
 }
 fclose($handle);

?>

however fseek fails:

<?php

 $handle = fopen('20gbfile', 'r');
 echo fread($handle, PHP_INT_MAX);
 echo fread($handle, 2);
 fseek($handle, -1, SEEK_CUR);
 echo fread($handle, 1);
 fclose($handle);

?>

Expected result:
----------------
echo the byte from position PHP_INT_MAX+1

Actual result:
--------------
crash/fail