WordPress/wp-includes
Sergey Biryukov 6151fddb6c Code Modernization: Pass correct default value to setcookie() in wp_user_settings().
The `wp_user_settings()` function calls the PHP native `setcookie()` function, the fifth parameter of which is the ''optional'' `$domain` parameter which expects a `string`.

A parameter being optional, however, does not automatically make it nullable.

As of PHP 8.1, passing `null` to a non-nullable PHP native function will generate a deprecation notice.

In this case, this function call yielded a `setcookie(): Passing null to parameter #5 ($domain) of type string is deprecated` notice.

Changing the `null` to an empty string fixes this without a backward compatibility break.

References:
* [https://www.php.net/manual/en/function.setcookie.php PHP Manual: setcookie()]
* [https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg PHP RFC: Deprecate passing null to non-nullable arguments of internal functions]

Follow-up to [29478].

Props ocean90, shenyanzhi, meysamnorouzi, jrf.
Fixes #54914.
Built from https://develop.svn.wordpress.org/trunk@53490


git-svn-id: http://core.svn.wordpress.org/trunk@53079 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-06-12 11:11:11 +00:00
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