Ticket #33045: 33045.patch

post-template.php

@@ -387 +387 @@
 }
 
 /**
+ * Whether the post has parent.
+ *
+ * @since 4.3.0
+ *
+ * @param int|WP_Post $id Optional. Post ID or post object.
+ * @return bool
+ */
+function has_parent( $id = 0 ) {
+        $post = get_post( $id );
+        return ( $post->post_parent > 0 );
+}
+
+/**
+ * Retrieve the parent post ID.
+ *
+ * @since 4.3.0
+ *
+ * @param int|WP_Post $id Optional. Post ID or post object.
+ * @return int
+ */
+function get_parent( $id = 0 ) {
+        $post = get_post( $id );
+        if ( empty( $post ) || ( $post->post_parent <= 0 ) ) {
+                return '';
+        }
+
+        /**
+         * Filter the retrieved post parent.
+         *
+         * @since 4.3.0
+         *
+         * @param string $post_parent The post parent.
+         */
+        return apply_filters( 'get_parent', $post->post_parent );
+}
+
+/**
  * Display the classes for the post div.
  *
  * @since 2.7.0