Offset 'dirname' of pathinfo function not always exists

[guvra]

Bug report

When calling pathinfo on an empty string, the function returns an array with only 2 keys:

• basename
• filename

Example:

php -r 'var_dump(pathinfo(""));'
Command line code:1:
array(2) {
  'basename' =>
  string(0) ""
  'filename' =>
  string(0) ""
}

On the other hand, phpstan expects this array to always contain the "dirname" offset.
So phpstan throws an error if we check whether dirname exists or not:

Code snippet that reproduces the problem

https://phpstan.org/r/fa3b7db7-5ce8-41d0-a63f-73742025ea3d

Expected output

PHPStan shouldn't detect an issue when we test whether the dirname offset exists.

[github-actions]

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