Description:
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If you are in directory: rootdir/

and you require file: rootdir/dir/file1.php

and file1.php requires file2.php

if a file named file2.php does not exist in rootdir/, then file2 will be rootdir/dir/file2.php,

BUT, if a file named file2.php exists in rootdir/, then file2 will be rootdir/file2.php

Reproduce code:
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#### base.php
require 'somedir/file1.php';

#### file1.php
require 'file2.php';



Expected result:
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if ./file2.php exists, then file1.php will include ./file2.php

if ./file2.php does not exist and ./somedir/file2.php exists, then file1.php will include ./somedir/file2.php