Sergey Biryukov d93f76dca8 Code Modernization: Correct handling of null in wp_parse_str().
This fixes `parse_str(): Passing null to parameter  ($string) of type string is deprecated` notices on PHP 8.1, without change in behaviour.

Impact: 311 of the pre-existing tests are affected by this issue.

The PHP native `parse_str()` function expects a string, however, based on the failing tests, it is clear there are functions in WordPress which passes a non-string – including `null` – value to the `wp_parse_str()` function, which would subsequently pass it onto the PHP native function without further input validation.

Most notable offender is the `wp_parse_args()` function which special cases arrays and objects, but passes everything else off to `wp_parse_str()`.

Several ways to fix this issue have been explored, including checking the received value with `is_string()` or `is_scalar()` before passing it off to the PHP native `parse_str()` function.

In the end it was decided against these in favor of a string cast as:
* `is_string()` would significantly change the behavior for anything non-string.
* `is_scalar()` up to a point as well, as it does not take objects with a `__toString()` method into account.

Executing a string cast on the received value before passing it on maintains the pre-existing behavior while still preventing the deprecation notice coming from PHP 8.1.

Reference: [https://www.php.net/manual/en/function.parse-str.php PHP Manual: parse_str()]

Follow-up to [5709].

Props jrf, hellofromTonya, lucatume, SergeyBiryukov.
See .

git-svn-id: https://develop.svn.wordpress.org/trunk@51624 602fd350-edb4-49c9-b593-d223f7449a82
2021-08-16 22:16:32 +00:00

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Clone the current repository using git clone https://github.com/WordPress/wordpress-develop.git. Then in your terminal move to the repository folder cd wordpress-develop and run the following commands:

npm install
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npm run test:php
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