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<title>[54782] trunk: Posts, Post Types: Revert `get_page_by_title()`'s use of `WP_Query`.</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/54782">54782</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/54782","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>peterwilsoncc</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-11-10 00:44:10 +0000 (Thu, 10 Nov 2022)</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'>Posts, Post Types: Revert `get_page_by_title()`'s use of `WP_Query`.

Revert to legacy database query in `get_pages_by_title()`. Due to the lack of `orderby` clause in the previous database query, it is not possible to gain consistent results by converting the function to a `WP_Query` wrapper.

Reverts [54271, 54242, 54234].

Props Bjorn2404, 10upsimon, dilipbheda, mukesh27, spacedmonkey, TimothyBlynJacobs, rjasdfiii, stentibbing, pbiron, pento.
Fixes <a href="https://core.trac.wordpress.org/ticket/57039">#57039</a>, <a href="https://core.trac.wordpress.org/ticket/56991">#56991</a>.
See <a href="https://core.trac.wordpress.org/ticket/57041">#57041</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludespostphp">trunk/src/wp-includes/post.php</a></li>
</ul>

<h3>Removed Paths</h3>
<ul>
<li><a href="#trunktestsphpunittestspostgetPageByTitlephp">trunk/tests/phpunit/tests/post/getPageByTitle.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludespostphp"></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/post.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/post.php    2022-11-09 18:35:58 UTC (rev 54781)
+++ trunk/src/wp-includes/post.php      2022-11-10 00:44:10 UTC (rev 54782)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -5766,6 +5766,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 2.1.0
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 3.0.0 The `$post_type` parameter was added.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
</ins><span class="cx" style="display: block; padding: 0 10px">  * @param string       $page_title Page title.
</span><span class="cx" style="display: block; padding: 0 10px">  * @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
</span><span class="cx" style="display: block; padding: 0 10px">  *                                 correspond to a WP_Post object, an associative array, or a numeric array,
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -5774,25 +5776,40 @@
</span><span class="cx" style="display: block; padding: 0 10px">  * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $args  = array(
-               'title'                  => $page_title,
-               'post_type'              => $post_type,
-               'post_status'            => get_post_stati(),
-               'posts_per_page'         => 1,
-               'update_post_term_cache' => false,
-               'update_post_meta_cache' => false,
-               'no_found_rows'          => true,
-               'orderby'                => 'post_date ID',
-               'order'                  => 'ASC',
-       );
-       $query = new WP_Query( $args );
-       $pages = $query->posts;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ global $wpdb;
</ins><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( $pages ) ) {
-               return null;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( is_array( $post_type ) ) {
+               $post_type           = esc_sql( $post_type );
+               $post_type_in_string = "'" . implode( "','", $post_type ) . "'";
+               $sql                 = $wpdb->prepare(
+                       "
+                       SELECT ID
+                       FROM $wpdb->posts
+                       WHERE post_title = %s
+                       AND post_type IN ($post_type_in_string)
+               ",
+                       $page_title
+               );
+       } else {
+               $sql = $wpdb->prepare(
+                       "
+                       SELECT ID
+                       FROM $wpdb->posts
+                       WHERE post_title = %s
+                       AND post_type = %s
+               ",
+                       $page_title,
+                       $post_type
+               );
</ins><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">-        return get_post( $pages[0], $output );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $page = $wpdb->get_var( $sql );
+
+       if ( $page ) {
+               return get_post( $page, $output );
+       }
+
+       return null;
</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"> /**
</span></span></pre></div>
<a id="trunktestsphpunittestspostgetPageByTitlephp"></a>
<div class="delfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Deleted: trunk/tests/phpunit/tests/post/getPageByTitle.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/post/getPageByTitle.php 2022-11-09 18:35:58 UTC (rev 54781)
+++ trunk/tests/phpunit/tests/post/getPageByTitle.php   2022-11-10 00:44:10 UTC (rev 54782)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1,340 +0,0 @@
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-<?php
-
-/**
- * @group post
- * @covers ::get_page_by_title
- */
-class Tests_Post_GetPageByTitle extends WP_UnitTestCase {
-
-       /**
-        * Generate shared fixtures.
-        *
-        * These are not used in the tests but are rather used to populate the
-        * posts table and ensure that the tests return the correct post object
-        * by design rather than through chance.
-        */
-       public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
-               // Fill the database with some pages.
-               $factory->post->create_many(
-                       2,
-                       array(
-                               'post_type' => 'page',
-                       )
-               );
-
-               // Fill the database with some attachments.
-               $factory->post->create_many(
-                       2,
-                       array(
-                               'post_type' => 'attachment',
-                       )
-               );
-
-               // Fill the database with some test post types.
-               register_post_type( 'wptests_pt' );
-               $factory->post->create_many(
-                       2,
-                       array(
-                               'post_type' => 'wptests_pt',
-                       )
-               );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_get_page_by_title_priority() {
-               $attachment = self::factory()->post->create_and_get(
-                       array(
-                               'post_title' => 'some-other-page',
-                               'post_type'  => 'attachment',
-                       )
-               );
-               $page       = self::factory()->post->create_and_get(
-                       array(
-                               'post_title' => 'some-page',
-                               'post_type'  => 'page',
-                       )
-               );
-
-               $this->assertEquals( $page, get_page_by_title( 'some-page' ), 'should return a post of the requested type before returning an attachment.' );
-
-               $this->assertEquals( $attachment, get_page_by_title( 'some-other-page', OBJECT, 'attachment' ), "will still select an attachment when a post of the requested type doesn't exist." );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_should_match_top_level_page() {
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               $found = get_page_by_title( 'foo' );
-
-               $this->assertSame( $page, $found->ID );
-       }
-
-       /**
-        * @ticket 36905
-        * @ticket 56609
-        */
-       public function test_should_be_case_insensitive_match() {
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'Foo',
-                       )
-               );
-
-               $found = get_page_by_title( 'foo' );
-
-               $this->assertSame( $page, $found->ID );
-       }
-
-       /**
-        * Test the oldest published post is matched first.
-        *
-        * Per the docs: in case of more than one post having the same title,
-        * it will check the oldest publication date, not the smallest ID.
-        *
-        * @ticket 36905
-        * @ticket 56609
-        */
-       public function test_should_match_oldest_published_date_when_titles_match() {
-               self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               $old_page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                               'post_date'  => '1984-01-11 05:00:00',
-                       )
-               );
-
-               $found = get_page_by_title( 'foo' );
-
-               $this->assertSame( $old_page, $found->ID );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_inherit() {
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'   => 'page',
-                               'post_title'  => 'foo',
-                               'post_status' => 'inherit',
-                       )
-               );
-
-               $found = get_page_by_title( 'foo' );
-
-               $this->assertSame( $page, $found->ID );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_should_obey_post_type() {
-               register_post_type( 'wptests_pt' );
-
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'wptests_pt',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               $found = get_page_by_title( 'foo' );
-               $this->assertNull( $found, 'Should return null, as post type does not match' );
-
-               $found = get_page_by_title( 'foo', OBJECT, 'wptests_pt' );
-               $this->assertSame( $page, $found->ID, 'Should return find post, as post type does do match' );
-       }
-
-
-       /**
-        * @ticket 36905
-        */
-       public function test_should_hit_cache() {
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               // Prime cache.
-               $found = get_page_by_title( 'foo' );
-               $this->assertSame( $page, $found->ID, 'Should return find page.' );
-
-               $num_queries = get_num_queries();
-
-               $found = get_page_by_title( 'foo' );
-               $this->assertSame( $page, $found->ID, 'Should return find page on second run.' );
-               $this->assertSame( $num_queries, get_num_queries(), 'Should not result in another database query.' );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_bad_title_should_be_cached() {
-               // Prime cache.
-               $found = get_page_by_title( 'foo' );
-               $this->assertNull( $found, 'Should return not find a page.' );
-
-               $num_queries = get_num_queries();
-
-               $found = get_page_by_title( 'foo' );
-               $this->assertNull( $found, 'Should return not find a page on second run.' );
-               $this->assertSame( $num_queries, get_num_queries(), 'Should not result in another database query.' );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_bad_title_served_from_cache_should_not_fall_back_on_current_post() {
-               global $post;
-
-               // Fake the global.
-               $post = self::factory()->post->create_and_get();
-
-               // Prime cache.
-               $found = get_page_by_title( 'foo' );
-               $this->assertNull( $found, 'Should return not find a page.' );
-
-               $num_queries = get_num_queries();
-
-               $found = get_page_by_title( 'foo' );
-               $this->assertNull( $found, 'Should return not find a page on second run.' );
-               $this->assertSame( $num_queries, get_num_queries(), 'Should not result in another database query.' );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_cache_should_not_match_post_in_different_post_type_with_same_title() {
-               register_post_type( 'wptests_pt' );
-
-               $p1 = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               $p2 = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'wptests_pt',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               // Prime cache for the page.
-               $found = get_page_by_title( 'foo' );
-               $this->assertSame( $p1, $found->ID, 'Should find a page.' );
-
-               $num_queries = get_num_queries();
-
-               $found = get_page_by_title( 'foo', OBJECT, 'wptests_pt' );
-               $this->assertSame( $p2, $found->ID, 'Should find a post with post type wptests_pt.' );
-               ++$num_queries;
-               $this->assertSame( $num_queries, get_num_queries(), 'Should result in another database query.' );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_cache_should_be_invalidated_when_post_title_is_edited() {
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               // Prime cache.
-               $found = get_page_by_title( 'foo' );
-               $this->assertSame( $page, $found->ID, 'Should find a page.' );
-
-               wp_update_post(
-                       array(
-                               'ID'         => $page,
-                               'post_title' => 'bar',
-                       )
-               );
-
-               $num_queries = get_num_queries();
-
-               $found = get_page_by_title( 'bar' );
-               $this->assertSame( $page, $found->ID, 'Should find a page with the new title.' );
-               ++$num_queries;
-               $this->assertSame( $num_queries, get_num_queries(), 'Should result in another database query.' );
-       }
-
-       /**
-        * @ticket 36905
-        */
-       public function test_output_param_should_be_obeyed_for_cached_value() {
-               $page = self::factory()->post->create(
-                       array(
-                               'post_type'  => 'page',
-                               'post_title' => 'foo',
-                       )
-               );
-
-               // Prime cache.
-               $found = get_page_by_title( 'foo' );
-
-               $num_queries = get_num_queries();
-               $this->assertSame( $page, $found->ID, 'Should find a page.' );
-
-               $object = get_page_by_title( 'foo', OBJECT );
-               $this->assertIsObject( $object, 'Should be an object.' );
-               $this->assertSame( $page, $object->ID, 'Should match post id.' );
-               $this->assertSame( $num_queries, get_num_queries(), 'Should not result in another database query.' );
-
-               $array_n = get_page_by_title( 'foo', ARRAY_N );
-               ++$num_queries; // Add one database query for loading of post metadata.
-               $this->assertIsArray( $array_n, 'Should be numbric array.' );
-               $this->assertSame( $page, $array_n[0], 'Should match post id.' );
-               $this->assertSame( $num_queries, get_num_queries(), 'Should not result in another database query.' );
-
-               $array_a = get_page_by_title( 'foo', ARRAY_A );
-               $this->assertIsArray( $array_a, 'Should be associative array.' );
-               $this->assertSame( $page, $array_a['ID'], 'Should match post id.' );
-               $this->assertSame( $num_queries, get_num_queries(), 'Should not result in another database query.' );
-       }
-
-       /**
-        * Ensure get_page_by_title() only runs the query once.
-        *
-        * @ticket 56721
-        * @covers ::get_page_by_title
-        */
-       public function test_should_not_run_query_more_than_once() {
-               $page = self::factory()->post->create_and_get(
-                       array(
-                               'post_title' => 'some-page',
-                               'post_type'  => 'page',
-                       )
-               );
-
-               // Use the `pre_get_posts` hook to ensure the query is only run once.
-               $ma = new MockAction();
-               add_action( 'pre_get_posts', array( $ma, 'action' ) );
-
-               get_page_by_title( 'some-page' );
-               $this->assertSame( 1, $ma->get_call_count(), 'Query does not run exactly once.' );
-       }
-}
</del></span></pre>
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