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<title>[27837] trunk: Avoid infinite recursion in get_term_children() when a term is incorrectly a parent of itself.</title>
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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/27837">27837</a></dd>
<dt>Author</dt> <dd>nacin</dd>
<dt>Date</dt> <dd>2014-03-29 06:07:17 +0000 (Sat, 29 Mar 2014)</dd>
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<h3>Log Message</h3>
<pre>Avoid infinite recursion in get_term_children() when a term is incorrectly a parent of itself.
props kovshenin.
fixes <a href="http://core.trac.wordpress.org/ticket/27123">#27123</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludestaxonomyphp">trunk/src/wp-includes/taxonomy.php</a></li>
<li><a href="#trunktestsphpunitteststermgetTermsphp">trunk/tests/phpunit/tests/term/getTerms.php</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludestaxonomyphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/taxonomy.php (27836 => 27837)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/taxonomy.php 2014-03-29 06:02:01 UTC (rev 27836)
+++ trunk/src/wp-includes/taxonomy.php 2014-03-29 06:07:17 UTC (rev 27837)
</span><span class="lines">@@ -1107,6 +1107,10 @@
</span><span class="cx"> $children = $terms[$term_id];
</span><span class="cx">
</span><span class="cx"> foreach ( (array) $terms[$term_id] as $child ) {
</span><ins>+ if ( $term_id == $child ) {
+ continue;
+ }
+
</ins><span class="cx"> if ( isset($terms[$child]) )
</span><span class="cx"> $children = array_merge($children, get_term_children($child, $taxonomy));
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunktestsphpunitteststermgetTermsphp"></a>
<div class="modfile"><h4>Modified: trunk/tests/phpunit/tests/term/getTerms.php (27836 => 27837)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/tests/phpunit/tests/term/getTerms.php 2014-03-29 06:02:01 UTC (rev 27836)
+++ trunk/tests/phpunit/tests/term/getTerms.php 2014-03-29 06:07:17 UTC (rev 27837)
</span><span class="lines">@@ -333,4 +333,22 @@
</span><span class="cx"> $terms = get_terms( 'category', array( 'child_of' => $parent, 'hide_empty' => false ) );
</span><span class="cx"> $this->assertEquals( 1, count( $terms ) );
</span><span class="cx"> }
</span><ins>+
+ /**
+ * @ticket 27123
+ */
+ function test_get_term_children_recursion() {
+ // Assume there is a way to insert a term with the parent pointing to itself
+ // See: https://core.trac.wordpress.org/changeset/15806
+ remove_filter( 'wp_update_term_parent', 'wp_check_term_hierarchy_for_loops', 10 );
+
+ $term = wp_insert_term( 'Test', 'category' );
+ $term = wp_update_term( $term['term_id'], 'category', array( 'parent' => $term['term_id'] ) );
+ $term = get_term( $term['term_id'], 'category' );
+
+ $this->assertEquals( $term->term_id, $term->parent );
+ $this->assertInternalType( 'array', get_term_children( $term->term_id, 'category' ) );
+
+ add_filter( 'wp_update_term_parent', 'wp_check_term_hierarchy_for_loops', 10, 3 );
+ }
</ins><span class="cx"> }
</span></span></pre>
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