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<title>[56939] trunk: Posts, Post Types: Don't force trailing slash in `get_pagenum_link()`.</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/56939">56939</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/56939","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>costdev</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-10-16 00:05:28 +0000 (Mon, 16 Oct 2023)</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: Don't force trailing slash in `get_pagenum_link()`.

Previously, a trailing slash was appended to the link returned from `get_pagenum_link()`. If the permalink structure didn't contain a trailing slash, this link could fail.

This change removes trailing slashes and only appends one if the site is set for adding trailing slashes.

This adds a new test file for the accompanying tests, `tests/phpunit/tests/link/getPagenumLink.php`, and moves an existing test for `get_pagenum_link()` to the same file.

Props davemad-davenet, darkfate, Nazgul, scribu, nacin, obenland, chriscct7, jesin, matthewppelsheimer, audrasjb, petitphp, mukesh27, oglekler, mai21, webtechpooja, tejwanihemant, nicolefurlan, hellofromTonya, costdev.
Fixes <a href="https://core.trac.wordpress.org/ticket/2877">#2877</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeslinktemplatephp">trunk/src/wp-includes/link-template.php</a></li>
<li><a href="#trunktestsphpunittestslinkphp">trunk/tests/phpunit/tests/link.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunktestsphpunittestslinkgetPagenumLinkphp">trunk/tests/phpunit/tests/link/getPagenumLink.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludeslinktemplatephp"></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/link-template.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/link-template.php   2023-10-15 14:53:12 UTC (rev 56938)
+++ trunk/src/wp-includes/link-template.php     2023-10-16 00:05:28 UTC (rev 56939)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2431,6 +2431,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $qs_regex = '|\?.*?$|';
</span><span class="cx" style="display: block; padding: 0 10px">                preg_match( $qs_regex, $request, $qs_match );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $parts   = array();
+               $parts[] = untrailingslashit( get_bloginfo( 'url' ) );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 if ( ! empty( $qs_match[0] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $query_string = $qs_match[0];
</span><span class="cx" style="display: block; padding: 0 10px">                        $request      = preg_replace( $qs_regex, '', $request );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2442,17 +2445,21 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $request = preg_replace( '|^' . preg_quote( $wp_rewrite->index, '|' ) . '|i', '', $request );
</span><span class="cx" style="display: block; padding: 0 10px">                $request = ltrim( $request, '/' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $base = trailingslashit( get_bloginfo( 'url' ) );
-
</del><span class="cx" style="display: block; padding: 0 10px">                 if ( $wp_rewrite->using_index_permalinks() && ( $pagenum > 1 || '' !== $request ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $base .= $wp_rewrite->index . '/';
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $parts[] = $wp_rewrite->index;
</ins><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">+                $parts[] = untrailingslashit( $request );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 if ( $pagenum > 1 ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $request = ( ( ! empty( $request ) ) ? trailingslashit( $request ) : $request ) . user_trailingslashit( $wp_rewrite->pagination_base . '/' . $pagenum, 'paged' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $parts[] = $wp_rewrite->pagination_base;
+                       $parts[] = $pagenum;
</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">-                $result = $base . $request . $query_string;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $result = user_trailingslashit( implode( '/', array_filter( $parts ) ), 'paged' );
+               if ( ! empty( $query_string ) ) {
+                       $result .= $query_string;
+               }
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span></span></pre></div>
<a id="trunktestsphpunittestslinkgetPagenumLinkphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/tests/link/getPagenumLink.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/link/getPagenumLink.php                         (rev 0)
+++ trunk/tests/phpunit/tests/link/getPagenumLink.php   2023-10-16 00:05:28 UTC (rev 56939)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,199 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * @group link
+ * @covers ::get_pagenum_link
+ */
+class Tests_Link_GetPagenumLink extends WP_UnitTestCase {
+
+       /**
+        * The original value of `$_SERVER['REQUEST_URI']`.
+        *
+        * @var string|null
+        */
+       protected static $request_uri_original;
+
+       /**
+        * Backs up the value of `$_SERVER['REQUEST_URI']` before any tests run.
+        */
+       public static function set_up_before_class() {
+               parent::set_up_before_class();
+
+               if ( isset( $_SERVER['REQUEST_URI'] ) ) {
+                       self::$request_uri_original = $_SERVER['REQUEST_URI'];
+               }
+       }
+
+       /**
+        * Restores the value of `$_SERVER['REQUEST_URI']` after each test runs.
+        */
+       public function tear_down() {
+               if ( null === self::$request_uri_original ) {
+                       unset( $_SERVER['REQUEST_URI'] );
+               } else {
+                       $_SERVER['REQUEST_URI'] = self::$request_uri_original;
+               }
+
+               parent::tear_down();
+       }
+
+       /**
+        * @ticket 8847
+        */
+       public function test_get_pagenum_link_case_insensitivity() {
+               $this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
+
+               add_filter( 'home_url', array( $this, 'get_pagenum_link_cb' ) );
+               $_SERVER['REQUEST_URI'] = '/woohoo';
+               $paged                  = get_pagenum_link( 2 );
+
+               remove_filter( 'home_url', array( $this, 'get_pagenum_link_cb' ) );
+               $this->assertSame( $paged, home_url( '/WooHoo/page/2/' ) );
+       }
+
+       /**
+        * Appends '/WooHoo' to the provided URL.
+        *
+        * Callback for the 'home_url' filter hook.
+        *
+        * @param string $url The base URL.
+        * @return string The base URL with '/WooHoo' appended.
+        */
+       public function get_pagenum_link_cb( $url ) {
+               return $url . '/WooHoo';
+       }
+
+       /**
+        * Tests that a trailing slash is not added to the link.
+        *
+        * @ticket 2877
+        *
+        * @dataProvider data_get_pagenum_link_plain_permalinks
+        * @dataProvider data_get_pagenum_link
+        *
+        * @param string $permalink_structure The structure to use for permalinks.
+        * @param string $request_uri         The value for `$_SERVER['REQUEST_URI']`.
+        * @param int    $pagenum             The page number to get the link for.
+        * @param string $expected            The expected relative URL.
+        */
+       public function test_get_pagenum_link_should_not_add_trailing_slash( $permalink_structure, $request_uri, $pagenum, $expected ) {
+               $this->set_permalink_structure( $permalink_structure );
+               $_SERVER['REQUEST_URI'] = $request_uri;
+               $paged                  = get_pagenum_link( $pagenum );
+
+               $this->assertSame( home_url( $expected ), $paged );
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_get_pagenum_link_plain_permalinks() {
+               return array(
+                       'page 1 and plain permalinks' => array(
+                               'permalink_structure' => '',
+                               'request_uri'         => '/?paged=2',
+                               'pagenum'             => 1,
+                               'expected'            => '/',
+                       ),
+                       'page 2 and plain permalinks' => array(
+                               'permalink_structure' => '',
+                               'request_uri'         => '/',
+                               'pagenum'             => 2,
+                               'expected'            => '/?paged=2',
+                       ),
+               );
+       }
+
+       /**
+        * Tests that a trailing slash is added to the link when a trailing slash
+        * exists in the permalink structure.
+        *
+        * @ticket 2877
+        *
+        * @dataProvider data_get_pagenum_link
+        *
+        * @param string $permalink_structure The structure to use for permalinks.
+        * @param string $request_uri         The value for `$_SERVER['REQUEST_URI']`.
+        * @param int    $pagenum             The page number to get the link for.
+        * @param string $expected            The expected relative URL.
+        */
+       public function test_get_pagenum_link_should_add_trailing_slash( $permalink_structure, $request_uri, $pagenum, $expected ) {
+               // Ensure the permalink structure has a trailing slash.
+               $permalink_structure = trailingslashit( $permalink_structure );
+
+               // Ensure the expected value has a trailing slash at the appropriate position.
+               if ( str_contains( $expected, '?' ) ) {
+                       // Contains query args.
+                       $parts    = explode( '?', $expected, 2 );
+                       $expected = trailingslashit( $parts[0] ) . '?' . $parts[1];
+               } else {
+                       $expected = trailingslashit( $expected );
+               }
+
+               $this->set_permalink_structure( $permalink_structure );
+               $_SERVER['REQUEST_URI'] = $request_uri;
+               $paged                  = get_pagenum_link( $pagenum );
+
+               $this->assertSame( home_url( $expected ), $paged );
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_get_pagenum_link() {
+               return array(
+                       'page 1 and index.php'                  => array(
+                               'permalink_structure' => '/index.php/%year%/%monthnum%/%day%/%postname%',
+                               'request_uri'         => '/index.php/woohoo/page/2/',
+                               'pagenum'             => 1,
+                               'expected'            => '/index.php/woohoo',
+                       ),
+                       'page 2 and index.php'                  => array(
+                               'permalink_structure' => '/index.php/%year%/%monthnum%/%day%/%postname%',
+                               'request_uri'         => '/index.php/woohoo/page/2/',
+                               'pagenum'             => 2,
+                               'expected'            => '/index.php/woohoo/page/2',
+                       ),
+                       'page 1 with date-based permalinks'     => array(
+                               'permalink_structure' => '/%year%/%monthnum%/%day%/%postname%',
+                               'request_uri'         => '/woohoo/page/2/',
+                               'pagenum'             => 1,
+                               'expected'            => '/woohoo',
+                       ),
+                       'page 2 with date-based permalinks'     => array(
+                               'permalink_structure' => '/%year%/%monthnum%/%day%/%postname%',
+                               'request_uri'         => '/woohoo',
+                               'pagenum'             => 2,
+                               'expected'            => '/woohoo/page/2',
+                       ),
+                       'page 1 with postname-based permalinks' => array(
+                               'permalink_structure' => '/%postname%',
+                               'request_uri'         => '/woohoo/page/2',
+                               'pagenum'             => 1,
+                               'expected'            => '/woohoo',
+                       ),
+                       'page 2 with postname-based permalinks' => array(
+                               'permalink_structure' => '/%postname%',
+                               'request_uri'         => '/woohoo',
+                               'pagenum'             => 2,
+                               'expected'            => '/woohoo/page/2',
+                       ),
+                       'page 1 with postname-based permalinks and query args' => array(
+                               'permalink_structure' => '/%postname%',
+                               'request_uri'         => '/woohoo/page/2?test=1234',
+                               'pagenum'             => 1,
+                               'expected'            => '/woohoo?test=1234',
+                       ),
+                       'page 2 with postname-based permalinks and query args' => array(
+                               'permalink_structure' => '/%postname%',
+                               'request_uri'         => '/woohoo?test=1234',
+                               'pagenum'             => 2,
+                               'expected'            => '/woohoo/page/2?test=1234',
+                       ),
+               );
+       }
+}
</ins></span></pre></div>
<a id="trunktestsphpunittestslinkphp"></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/link.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/link.php        2023-10-15 14:53:12 UTC (rev 56938)
+++ trunk/tests/phpunit/tests/link.php  2023-10-16 00:05:28 UTC (rev 56939)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4,28 +4,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> class Tests_Link extends WP_UnitTestCase {
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        public function get_pagenum_link_cb( $url ) {
-               return $url . '/WooHoo';
-       }
-
-       /**
-        * @ticket 8847
-        */
-       public function test_get_pagenum_link_case_insensitivity() {
-               $old_req_uri = $_SERVER['REQUEST_URI'];
-
-               $this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-
-               add_filter( 'home_url', array( $this, 'get_pagenum_link_cb' ) );
-               $_SERVER['REQUEST_URI'] = '/woohoo';
-               $paged                  = get_pagenum_link( 2 );
-
-               remove_filter( 'home_url', array( $this, 'get_pagenum_link_cb' ) );
-               $this->assertSame( $paged, home_url( '/WooHoo/page/2/' ) );
-
-               $_SERVER['REQUEST_URI'] = $old_req_uri;
-       }
-
</del><span class="cx" style="display: block; padding: 0 10px">         public function test_wp_get_shortlink() {
</span><span class="cx" style="display: block; padding: 0 10px">                $post_id  = self::factory()->post->create();
</span><span class="cx" style="display: block; padding: 0 10px">                $post_id2 = self::factory()->post->create();
</span></span></pre>
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