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<title>[51652] trunk/src/wp-includes/sitemaps/class-wp-sitemaps-provider.php: Code Modernization: Pass correct default value to `http_build_query()` in `WP_Sitemaps_Provider::get_sitemap_url()`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/51652">51652</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/51652","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>SergeyBiryukov</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-08-23 11:42:58 +0000 (Mon, 23 Aug 2021)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Code Modernization: Pass correct default value to `http_build_query()` in `WP_Sitemaps_Provider::get_sitemap_url()`.
The `WP_Sitemaps_Provider::get_sitemap_url()` method calls the PHP native `http_build_query()` function, the second parameter of which is the ''optional'' `$numeric_prefix` parameter which expects a `string`.
A parameter being optional, however, does not automatically make it nullable.
As of PHP 8.1, passing `null` to a non-nullable PHP native function will generate a deprecation notice.
In this case, this function call yielded a `http_build_query(): Passing null to parameter <a href="https://core.trac.wordpress.org/ticket/2">#2</a> ($numeric_prefix) of type string is deprecated` notice.
Changing the `null` to an empty string fixes this without a backward compatibility break.
This change is already covered by tests as 14 of the existing tests failed on these function calls when running the tests on PHP 8.1.
References:
* [https://www.php.net/manual/en/function.http-build-query.php PHP Manual: http_build_query()]
* [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 <a href="https://core.trac.wordpress.org/changeset/48470">[48470]</a>.
Props jrf.
See <a href="https://core.trac.wordpress.org/ticket/53635">#53635</a>.</pre>
<h3>Modified Paths</h3>
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<li><a href="#trunksrcwpincludessitemapsclasswpsitemapsproviderphp">trunk/src/wp-includes/sitemaps/class-wp-sitemaps-provider.php</a></li>
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<a id="trunksrcwpincludessitemapsclasswpsitemapsproviderphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/sitemaps/class-wp-sitemaps-provider.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/sitemaps/class-wp-sitemaps-provider.php 2021-08-22 10:07:17 UTC (rev 51651)
+++ trunk/src/wp-includes/sitemaps/class-wp-sitemaps-provider.php 2021-08-23 11:42:58 UTC (rev 51652)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -160,7 +160,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> if ( ! $wp_rewrite->using_permalinks() ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $basename = '/?' . http_build_query( $params, null, '&' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $basename = '/?' . http_build_query( $params, '', '&' );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> return home_url( $basename );
</span></span></pre>
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