Just for information and in reply to a previous message left 4 years ago by "salsi at icosaedro dot it" :
Files larger than 2 GiB can be handled on 64-bit Linux systems.
My test in a terminal is as follow (using <?php ;?> tags to colour the results for ease of reading) :
$ php -v
<?php
"
PHP 7.2.24-0ubuntu0.18.04.7 (cli) (built: Oct  7 2020 15:24:25) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.24-0ubuntu0.18.04.7, Copyright (c) 1999-2018, by Zend Technologies
"
;?>
$ date ; dd if=/dev/zero of=/tmp/php_test_huge bs=1024K count=2100 ; date ; ls -l /tmp/php_test_huge
<?php
"
Wed Nov 11 15:35:46 +08 2020
2100+0 records in
2100+0 records out
2202009600 bytes (2.2 GB, 2.1 GiB) copied, 4.79192 s, 460 MB/s
Wed Nov 11 15:35:51 +08 2020
-rw-r--r-- 1 harold harold 2202009600 Nov 11 15:35 /tmp/php_test_huge
"
;?>
$ php -r 'var_dump(lstat("/tmp/php_test_huge"));'
<?php
"
array(26) {
  [0]=>
  int(2050)
  [1]=>
  int(19923027)
  [2]=>
  int(33188)
  [3]=>
  int(1)
  [4]=>
  int(1000)
  [5]=>
  int(1000)
  [6]=>
  int(0)
  [7]=>
  int(2202009600)
  [8]=>
  int(1605079647)
  [9]=>
  int(1605080149)
  [10]=>
  int(1605080149)
  [11]=>
  int(4096)
  [12]=>
  int(4300808)
  ["dev"]=>
  int(2050)
  ["ino"]=>
  int(19923027)
  ["mode"]=>
  int(33188)
  ["nlink"]=>
  int(1)
  ["uid"]=>
  int(1000)
  ["gid"]=>
  int(1000)
  ["rdev"]=>
  int(0)
  ["size"]=>
  int(2202009600)
  ["atime"]=>
  int(1605079647)
  ["mtime"]=>
  int(1605080149)
  ["ctime"]=>
  int(1605080149)
  ["blksize"]=>
  int(4096)
  ["blocks"]=>
  int(4300808)
}
"
;?>