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<title>[51121] trunk: Feeds: Avoid notices in `get_post_comments_feed_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/51121">51121</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/51121","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>antpb</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-06-08 22:59:19 +0000 (Tue, 08 Jun 2021)</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'>Feeds: Avoid notices in `get_post_comments_feed_link()`.
When an feed request is made to a non-existent page, surpress the notice.
Props dd32, SergeyBiryukov, mukesh27, hellofromTonya.
Fixes <a href="https://core.trac.wordpress.org/ticket/52814">#52814</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeslinktemplatephp">trunk/src/wp-includes/link-template.php</a></li>
<li><a href="#trunktestsphpunittestslinkgetPostCommentsFeedLinkphp">trunk/tests/phpunit/tests/link/getPostCommentsFeedLink.php</a></li>
</ul>
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<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 2021-06-08 22:54:59 UTC (rev 51120)
+++ trunk/src/wp-includes/link-template.php 2021-06-08 22:59:19 UTC (rev 51121)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -735,7 +735,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @param int $post_id Optional. Post ID. Default is the ID of the global `$post`.
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $feed Optional. Feed type. Possible values include 'rss2', 'atom'.
</span><span class="cx" style="display: block; padding: 0 10px"> * Default is the value of get_default_feed().
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @return string The permalink for the comments feed for the given post.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @return string The permalink for the comments feed for the given post on success, empty string on failure.
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> function get_post_comments_feed_link( $post_id = 0, $feed = '' ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $post_id = absint( $post_id );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -748,7 +748,13 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $feed = get_default_feed();
</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">- $post = get_post( $post_id );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $post = get_post( $post_id );
+
+ // Bail out if the post does not exist.
+ if ( ! $post instanceof WP_Post ) {
+ return '';
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $unattached = 'attachment' === $post->post_type && 0 === (int) $post->post_parent;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> if ( get_option( 'permalink_structure' ) ) {
</span></span></pre></div>
<a id="trunktestsphpunittestslinkgetPostCommentsFeedLinkphp"></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/getPostCommentsFeedLink.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/link/getPostCommentsFeedLink.php 2021-06-08 22:54:59 UTC (rev 51120)
+++ trunk/tests/phpunit/tests/link/getPostCommentsFeedLink.php 2021-06-08 22:59:19 UTC (rev 51121)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -138,4 +138,17 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $this->assertSame( $expected, $link );
</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 52814
+ */
+ public function test_nonexistent_page() {
+ $this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
+
+ // Use the largest integer to ensure the post does not exist.
+ $post_id = PHP_INT_MAX;
+ $link = get_post_comments_feed_link( $post_id );
+
+ $this->assertEmpty( $link );
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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