Ticket #12588: 12588.diff

post.php

@@ -661 +661 @@
 }
 
 /**
+ * Check if the current or specified post is a post type
+ *
+ * @since 3.0
+ * @uses $post
+ * @uses get_post_type()
+ *
+ * @param string|array $types Type or types to check.
+ * @param int $id Post ID. Defaults to current ID.
+ * @return bool
+ */
+function is_post_type( $types, $id = null ) {
+        global $post;
+
+        $id = ( null === $id )  ? $post->ID : $id;
+
+        return in_array( get_post_type( $id ), (array) $types );
+}
+
+/**
  * Retrieve the post type of the current post or of a given post.
  *
  * @since 2.1.0