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<title>[40293] trunk: Improve querying for terms with falsey names and slugs.</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/40293">40293</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/40293","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>2017-03-16 02:03:53 +0000 (Thu, 16 Mar 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'>Improve querying for terms with falsey names and slugs.

Prior to <a href="https://core.trac.wordpress.org/changeset/38677">[38677]</a>, `get_term_by()` would always return false if
an empty string were passed as the queried 'name' or 'slug'. The
refactor to use `get_terms()` broke this behavior; inappropriately
imprecise `empty()` checks caused the 'name' or 'slug' clause to be
discarded altogether when fetching terms, resulting in an incorrect
term being returned from the function.

We fix the regression by special-casing truly empty values passed
to `get_term_by()`, and ensuring that `WP_Term_Query` is properly
able to handle `0` and `'0'` term queries.

Props sstoqnov.
Fixes <a href="https://core.trac.wordpress.org/ticket/21760">#21760</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswptermqueryphp">trunk/src/wp-includes/class-wp-term-query.php</a></li>
<li><a href="#trunksrcwpincludestaxonomyphp">trunk/src/wp-includes/taxonomy.php</a></li>
<li><a href="#trunktestsphpunitteststermgetTermByphp">trunk/tests/phpunit/tests/term/getTermBy.php</a></li>
<li><a href="#trunktestsphpunitteststermgetTermsphp">trunk/tests/phpunit/tests/term/getTerms.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswptermqueryphp"></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/class-wp-term-query.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-term-query.php     2017-03-16 01:34:52 UTC (rev 40292)
+++ trunk/src/wp-includes/class-wp-term-query.php       2017-03-16 02:03:53 UTC (rev 40293)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -474,7 +474,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->sql_clauses['where']['exclusions'] = preg_replace( '/^\s*AND\s*/', '', $exclusions );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( ! empty( $args['name'] ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if (
+                       ( ! empty( $args['name'] ) ) ||
+                       ( is_string( $args['name'] ) && 0 !== strlen( $args['name'] ) )
+               ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         $names = (array) $args['name'];
</span><span class="cx" style="display: block; padding: 0 10px">                        foreach ( $names as &$_name ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                // `sanitize_term_field()` returns slashed data.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -484,7 +487,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->sql_clauses['where']['name'] = "t.name IN ('" . implode( "', '", array_map( 'esc_sql', $names ) ) . "')";
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( ! empty( $args['slug'] ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if (
+                       ( ! empty( $args['slug'] ) ) ||
+                       ( is_string( $args['slug'] ) && 0 !== strlen( $args['slug'] ) )
+               ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         if ( is_array( $args['slug'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $slug = array_map( 'sanitize_title', $args['slug'] );
</span><span class="cx" style="display: block; padding: 0 10px">                                $this->sql_clauses['where']['slug'] = "t.slug IN ('" . implode( "', '", $slug ) . "')";
</span></span></pre></div>
<a id="trunksrcwpincludestaxonomyphp"></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/taxonomy.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/taxonomy.php        2017-03-16 01:34:52 UTC (rev 40292)
+++ trunk/src/wp-includes/taxonomy.php  2017-03-16 02:03:53 UTC (rev 40293)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -835,6 +835,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">                return false;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        // No need to perform a query for empty 'slug' or 'name'.
+       if ( 'slug' === $field || 'name' === $field ) {
+               $value = (string) $value;
+
+               if ( 0 === strlen( $value ) ) {
+                       return false;
+               }
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         if ( 'id' === $field || 'term_id' === $field ) {
</span><span class="cx" style="display: block; padding: 0 10px">                $term = get_term( (int) $value, $taxonomy, $output, $filter );
</span><span class="cx" style="display: block; padding: 0 10px">                if ( is_wp_error( $term ) || null === $term ) {
</span></span></pre></div>
<a id="trunktestsphpunitteststermgetTermByphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/term/getTermBy.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/term/getTermBy.php      2017-03-16 01:34:52 UTC (rev 40292)
+++ trunk/tests/phpunit/tests/term/getTermBy.php        2017-03-16 02:03:53 UTC (rev 40293)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -205,4 +205,48 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( 0, $action->get_call_count() );
</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 21760
+        */
+       public function test_get_term_by_name_with_string_0() {
+               register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+               $term_id = $this->factory->term->create( array(
+                       'name'     => '0',
+                       'taxonomy' => 'wptests_tax',
+               ) );
+
+               $found = get_term_by( 'name', '0', 'wptests_tax' );
+               $this->assertSame( $term_id, $found->term_id );
+       }
+
+       /**
+        * @ticket 21760
+        */
+       public function test_get_term_by_slug_with_string_0() {
+               register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+               $term_id = $this->factory->term->create( array(
+                       'taxonomy' => 'wptests_tax',
+                       'name'     => '0',
+                       'slug'     => '0',
+               ) );
+
+               $found = get_term_by( 'slug', '0', 'wptests_tax' );
+               $this->assertSame( $term_id, $found->term_id );
+       }
+
+       /**
+        * @ticket 21760
+        */
+       public function test_get_term_by_with_empty_string() {
+               register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+               $found_by_slug = get_term_by( 'slug', '', 'wptests_tax' );
+               $found_by_name = get_term_by( 'name', '', 'wptests_tax' );
+
+               $this->assertFalse( $found_by_slug );
+               $this->assertFalse( $found_by_name );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="trunktestsphpunitteststermgetTermsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/term/getTerms.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/term/getTerms.php       2017-03-16 01:34:52 UTC (rev 40292)
+++ trunk/tests/phpunit/tests/term/getTerms.php 2017-03-16 02:03:53 UTC (rev 40293)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2223,6 +2223,57 @@
</span><span class="cx" style="display: block; padding: 0 10px">                return 'foo';
</span><span class="cx" style="display: block; padding: 0 10px">        }
</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 21760
+        */
+       public function test_with_term_slug_equal_to_string_0() {
+               register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+               $term_id = self::factory()->term->create( array(
+                       'name' => '0',
+                       'slug' => '0',
+                       'taxonomy' => 'wptests_tax',
+               ) );
+
+               $found = get_terms( array(
+                       'taxonomy'   => 'wptests_tax',
+                       'hide_empty' => 0,
+                       'slug'       => '0',
+               ) );
+
+               $this->assertEqualSets( array( $term_id ), wp_list_pluck( $found, 'term_id' ) );
+       }
+
+       /**
+        * @ticket 21760
+        */
+       public function test_with_multiple_term_slugs_one_equal_to_string_0() {
+               register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+               $term_id1 = self::factory()->term->create( array(
+                       'name'     => '0',
+                       'slug'     => '0',
+                       'taxonomy' => 'wptests_tax',
+               ) );
+
+               $term_id2 = self::factory()->term->create( array(
+                       'name'     => 'Test',
+                       'slug'     => 'test',
+                       'taxonomy' => 'wptests_tax',
+               ) );
+
+               $found = get_terms( array(
+                       'taxonomy'   => 'wptests_tax',
+                       'hide_empty' => 0,
+                       'slug'       => array(
+                               '0',
+                               'test',
+                       ),
+               ) );
+
+               $this->assertEqualSets( array( $term_id1, $term_id2 ), wp_list_pluck( $found, 'term_id' ) );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         protected function create_hierarchical_terms_and_posts() {
</span><span class="cx" style="display: block; padding: 0 10px">                $terms = array();
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre>
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