Description:
------------
If SplFileObject is instantiated with the third parameter (search include_path) set to true:

$file = new SplFileObject($filename, 'r', true);

and the file is indeed on path and found,
a consequent call to $file->getRealPath() returns false,
as if the file hasn't been found at all, instead of returning the real path.

Reproduce code:
---------------
/wwwroot
  |
  |-> /directory
  |    |
  |    |-> testfile.txt
  |
  |-> test.php


In test.php:

<?php

set_include_path(dirname(__FILE__) . '/directory');

try {

    $file = new SplFileObject('testfile.txt', 'r', true);
    var_dump($file->getRealPath());
    
} catch (RuntimeException $e) {
    echo 'File does not exist';
}


try {

    $file = new SplFileObject('./directory/test-file.txt', 'r', true);
    var_dump($file->getRealPath());

} catch (RuntimeException $e) {
    echo 'File does not exist';
}


Expected result:
----------------
/wwwroot/directory/testfile.txt
/wwwroot/directory/testfile.txt

Actual result:
--------------
false
/wwwroot/directory/testfile.txt