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WordPress/wp-includes
Sergey Biryukov c2d8b48d97 Code Modernization: Check the return type of wp_parse_url() in wp_mail().
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 PHP 8.1, if the home URL does not have a "host" component, it would lead to a `substr(): Passing null to parameter #1 ($string) of type string is deprecated` notice.

Changing the logic around and adding validation for the return type value of `wp_parse_url()` prevents that.

Follow-up to [48601], [51606], [51622], [51626], [51629], [51630].

Props dennisatyoast, jrf.
See #54730.
Built from https://develop.svn.wordpress.org/trunk@52799


git-svn-id: http://core.svn.wordpress.org/trunk@52388 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-02-25 13:48:00 +00:00
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