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<title>[41038] branches/4.8: Taxonomy: Avoid duplicates when querying for terms in taxonomies registered with `$args` parameter.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/41038">41038</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/41038","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>boonebgorges</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-07-13 13:42:44 +0000 (Thu, 13 Jul 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Taxonomy: Avoid duplicates when querying for terms in taxonomies registered with `$args` parameter.

<a href="https://core.trac.wordpress.org/changeset/40514">[40514]</a> introduced a bug that caused term queries to return some duplicates
when the `$taxonomies` array contained only taxonomies that were originally
registered with an `$args` array. We fix this bug by ensuring that
recursive `get_terms()` queries stop when all queried `$taxonomies` have
already been referenced.

Ports <a href="https://core.trac.wordpress.org/changeset/41037">[41037]</a> to the 4.8 branch.

Props bor0, atanasangelovdev.
Fixes <a href="https://core.trac.wordpress.org/ticket/41010">#41010</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches48srcwpincludestaxonomyphp">branches/4.8/src/wp-includes/taxonomy.php</a></li>
<li><a href="#branches48testsphpunitteststermwpGetObjectTermsphp">branches/4.8/tests/phpunit/tests/term/wpGetObjectTerms.php</a></li>
</ul>

<h3>Property Changed</h3>
<ul>
<li><a href="#branches48">branches/4.8/</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/4.8
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/4.8 2017-07-13 13:40:39 UTC (rev 41037)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/4.8  2017-07-13 13:42:44 UTC (rev 41038)
</ins><a id="branches48"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/4.8</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.1:18031
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.3:20543
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:18512,40872-40873,40879,40881,40883,40885,40897,40901,41009,41022
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:18512,40872-40873,40879,40881,40883,40885,40897,40901,41009,41022,41037
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches48srcwpincludestaxonomyphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/taxonomy.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/taxonomy.php 2017-07-13 13:40:39 UTC (rev 41037)
+++ branches/4.8/src/wp-includes/taxonomy.php   2017-07-13 13:42:44 UTC (rev 41038)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1864,7 +1864,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">        $args['taxonomy'] = $taxonomies;
</span><span class="cx" style="display: block; padding: 0 10px">        $args['object_ids'] = $object_ids;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $terms = array_merge( $terms, get_terms( $args ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Taxonomies registered without an 'args' param are handled here.
+       if ( ! empty( $taxonomies ) ) {
+               $terms = array_merge( $terms, get_terms( $args ) );
+       }
</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">         * Filters the terms for a given object or objects.
</span></span></pre></div>
<a id="branches48testsphpunitteststermwpGetObjectTermsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/tests/phpunit/tests/term/wpGetObjectTerms.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/tests/phpunit/tests/term/wpGetObjectTerms.php        2017-07-13 13:40:39 UTC (rev 41037)
+++ branches/4.8/tests/phpunit/tests/term/wpGetObjectTerms.php  2017-07-13 13:42:44 UTC (rev 41038)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -732,4 +732,40 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( array( $t1, $t3, $t2 ), $found );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * @ticket 41010
+        */
+       public function test_duplicate_terms_should_not_be_returned_when_passed_multiple_taxonomies_registered_with_args_array() {
+               $taxonomy1 = 'wptests_tax';
+               $taxonomy2 = 'wptests_tax_2';
+
+               // Any non-empty 'args' array triggers the bug.
+               $taxonomy_arguments = array(
+                       'args' => array( 0 ),
+               );
+
+               register_taxonomy( $taxonomy1, 'post', $taxonomy_arguments );
+               register_taxonomy( $taxonomy2, 'post', $taxonomy_arguments );
+
+               $post_id = self::factory()->post->create();
+               $term_1_id = self::factory()->term->create( array(
+                       'taxonomy' => $taxonomy1,
+               ) );
+               $term_2_id = self::factory()->term->create( array(
+                       'taxonomy' => $taxonomy2,
+               ) );
+
+               wp_set_object_terms( $post_id, $term_1_id, $taxonomy1 );
+               wp_set_object_terms( $post_id, $term_2_id, $taxonomy2 );
+
+               $expected = array( $term_1_id, $term_2_id );
+
+               $actual = wp_get_object_terms( $post_id, array( $taxonomy1, $taxonomy2 ), array(
+                       'orderby' => 'term_id',
+                       'fields' => 'ids',
+               ) );
+
+               $this->assertEqualSets( $expected, $actual );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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