From ba6f1ff56e0cf7c473a8e93c87d4a22a3aaa27ce Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <desrosj@git.wordpress.org>
Date: Thu, 10 Jan 2019 15:27:09 +0000
Subject: [PATCH] Media: Introduce the `has_post_thumbnail` filter.

Props rzen, desrosj.
Fixes #44859.

git-svn-id: https://develop.svn.wordpress.org/trunk@44542 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/post-thumbnail-template.php | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/post-thumbnail-template.php b/src/wp-includes/post-thumbnail-template.php
index c20e2df1aa..3293a98d77 100644
--- a/src/wp-includes/post-thumbnail-template.php
+++ b/src/wp-includes/post-thumbnail-template.php
@@ -23,7 +23,19 @@
  * @return bool Whether the post has an image attached.
  */
 function has_post_thumbnail( $post = null ) {
-	return (bool) get_post_thumbnail_id( $post );
+	$thumbnail_id  = get_post_thumbnail_id( $post );
+	$has_thumbnail = (bool) $thumbnail_id;
+
+	/**
+	 * Filters whether a post has a post thumbnail.
+	 *
+	 * @since 5.1.0
+	 *
+	 * @param bool             $has_thumbnail true if the post has a post thumbnail, otherwise false.
+	 * @param int|WP_Post|null $post          Post ID or WP_Post object. Default is global `$post`.
+	 * @param int|string       $thumbnail_id  Post thumbnail ID or empty string.
+	 */
+	return (bool) apply_filters( 'has_post_thumbnail', $has_thumbnail, $post, $thumbnail_id );
 }
 
 /**