PHP 8.1 preg_split() fails with depreciated error when no Static Authors are defined

[EEKimS]

[Deprecated] preg_split(): Passing null to parameter #2 ($subject) of type string is deprecated
Line 709 in /var/www/sites/the-wise-hippo/vendor/silverstripe/blog/src/Model/BlogPost.php

I feel like this function needs something to check if the AuthorNames is null, something like this maybe:

if( !is_null($this->AuthorNames) ){
	$authors = array_filter(preg_split('/\s*,\s*/', $this->AuthorNames));
}else{
	$authors = [];
}

[michalkleiner]

$authors = array_filter(preg_split('/\s*,\s*/', $this->AuthorNames ?? '')); should do it. Can you open a PR?

[EEKimS]

I have never done one of those, but i can say that digging around in the most recent branch looks like this issue has already been solved with the line:

$authors = array_filter(preg_split('/\s*,\s*/', $this->AuthorNames ?? '') ?? []);

It appears that i need to force an update in my code. Thank you for your help!