Ticket #17447: 17447.diff

src/wp-includes/post-functions.php

@@ -986 +986 @@
         if ( ! is_array( $wp_post_types ) )
                 $wp_post_types = array();
 
+        // Sanitize post type name.
+        $post_type = sanitize_key( $post_type );
+
+        if ( empty( $args['_builtin'] ) ) {
+                /**
+                 * Filter the arguments for registering a post type.
+                 *
+                 * Not available for built-in post types.
+                 *
+                 * @since 4.4.0
+                 *
+                 * @param array|string $args      Array or string of arguments for registering a post type.
+                 * @param string       $post_type Post type key.
+                 */
+                $args = apply_filters( 'register_post_type_args', $args, $post_type );
+        }
+
         // Args prefixed with an underscore are reserved for internal use.
         $defaults = array(
                 'labels'               => array(),
@@ -1017 +1034 @@
         $args = wp_parse_args( $args, $defaults );
         $args = (object) $args;
 
-        $post_type = sanitize_key( $post_type );
         $args->name = $post_type;
 
         if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {