Ticket #54375: 54375.2.diff

src/wp-includes/post.php

@@ -2130 +2130 @@
  * For all others, the 'publicly_queryable' value will be used.
  *
  * @since 5.7.0
+ * @since 5.9.0 Added `is_post_status_viewable` hook to filter the result.
  *
  * @param string|stdClass $post_status Post status name or object.
  * @return bool Whether the post status should be considered viewable.
@@ -2150 +2151 @@
                 return false;
         }
 
-        return $post_status->publicly_queryable || ( $post_status->_builtin && $post_status->public );
+        $is_viewable = $post_status->publicly_queryable || ( $post_status->_builtin && $post_status->public );
+
+        /**
+         * Filters whether a post status is considered "viewable".
+         *
+         * To avoid the potential for type errors in PHP 8.1 or later, this filter
+         * must return a boolean true for the post status to be considered viewable.
+         *
+         * All other values (even truthy values) will result in the function
+         * is_post_status_viewable() returning false.
+         *
+         * @since 5.9.0
+         *
+         * @param bool     $is_viewable Whether the post status is "viewable".
+         * @param stdClass $post_status Post status object.
+         */
+        return true === apply_filters( 'is_post_status_viewable', $is_viewable, $post_status );
 }
 
 /**