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<title>[48839] trunk/src/wp-includes/widgets.php: Code Modernization: Fix PHP 8 "ArgumentCountError: array_merge() does not accept unknown named parameters" fatal error in `retrieve_widgets()`.</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/48839">48839</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/48839","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>2020-08-21 21:49:02 +0000 (Fri, 21 Aug 2020)</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: Fix PHP 8 "ArgumentCountError: array_merge() does not accept unknown named parameters" fatal error in `retrieve_widgets()`.
As per the documentation of `call_user_func_array()`, the `$param_arr` should be a (numerically) indexed array, not a string-keyed array.
As we can use the spread operator in PHP 5.6+, there isn't really any need to use `call_user_func_array()` anyhow, we can call the `array_merge()` function directly.
The caveat to this is that the spread operator only works on numerically indexed arrays, so we need to wrap the `$sidebars_widgets` variable in a call to `array_values()` when using the spread operator.
Using `array_values()` in the existing `call_user_func_array()` call would also have solved this, but the solution now proposed, has the added benefit of getting rid of the overhead of `call_user_func_array()`.
Props jrf.
See <a href="https://core.trac.wordpress.org/ticket/50913">#50913</a>.</pre>
<h3>Modified Paths</h3>
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<li><a href="#trunksrcwpincludeswidgetsphp">trunk/src/wp-includes/widgets.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpincludeswidgetsphp"></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/widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/widgets.php 2020-08-21 21:32:49 UTC (rev 48838)
+++ trunk/src/wp-includes/widgets.php 2020-08-21 21:49:02 UTC (rev 48839)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1262,7 +1262,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $sidebars_widgets = wp_map_sidebars_widgets( $sidebars_widgets );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Find hidden/lost multi-widget instances.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $shown_widgets = call_user_func_array( 'array_merge', $sidebars_widgets );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $shown_widgets = array_merge( ...array_values( $sidebars_widgets ) );
</ins><span class="cx" style="display: block; padding: 0 10px"> $lost_widgets = array_diff( $registered_widgets_ids, $shown_widgets );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> foreach ( $lost_widgets as $key => $widget_id ) {
</span></span></pre>
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