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As per the PHP manual: > If the `component` parameter is omitted, an associative array is returned. > If the `component` parameter is specified, `parse_url()` returns a string (or an int, in the case of `PHP_URL_PORT`) instead of an array. If the requested component doesn't exist within the given URL, `null` will be returned. Reference: [https://www.php.net/manual/en/function.parse-url.php#refsect1-function.parse-url-returnvalues PHP Manual: parse_url(): Return Values] In this case, `parse_url()` is called with `PHP_URL_HOST` as `$component`, which returns `null` if the URL only has a path. The return value of `parse_url()` was then passed to `str_replace()`, leading to a notice on PHP 8.1: {{{ str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated }}} Adding validation for the return type value of `parse_url()` prevents that. This commit addresses a few errors in the test suite along the lines of: {{{ 5) Tests_Rewrite::test_url_to_postid_home_has_path str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated /var/www/src/wp-includes/rewrite.php:503 /var/www/tests/phpunit/tests/rewrite.php:271 /var/www/vendor/bin/phpunit:123 }}} Includes adding a dedicated unit test for a URL that only has a path. Follow-up to [41786], [51606], [51622], [51626], [51629], [51630], [52799]. Props jrf, aristath, poena, justinahinon, SergeyBiryukov. See #55656. git-svn-id: https://develop.svn.wordpress.org/trunk@54364 602fd350-edb4-49c9-b593-d223f7449a82