Ticket #5305: 5305.1.diff

src/wp-includes/post.php

@@ -3685 +3685 @@
 
         $original_slug = $slug;
 
+        /**
+         * Filter whether the post slug can be numeric.
+         *
+         * @since 4.2.0
+         *
+         * @param bool   $numeric_slugs Whether numeric slugs are allowed.
+         * @param string $slug          The post slug.
+         * @param string $post_type     Post type.
+         */
+        if ( is_numeric( $slug ) && apply_filters( 'wp_unique_post_slug_numeric_slugs', false, $slug, $post_type ) !== true ) {
+                /**
+                 * Filter the prefix for numeric slugs.
+                 *
+                 * Prefixes numeric slugs so they do not collide with dates in some permalink structures.
+                 * The default prefix is the value of `$post_type` with a hyphen attached to the end. 
+                 * For example, if the current post type is 'post', the default value will be 'post-'. 
+                 *
+                 * @since 4.2.0
+                 *
+                 * @param string $slug_prefix   The numeric slug prefix.
+                 * @param string $slug          The post slug.
+                 * @param int    $post_ID       Post ID.
+                 * @param string $post_status   The post status.
+                 * @param string $post_type     Post type.
+                 * @param int    $post_parent   Post parent ID
+                 * @param string $original_slug The original post slug.
+                 */
+                $slug_prefix = apply_filters( 'wp_unique_post_slug_numeric_slug_prefix', $post_type . '-', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
+
+                $slug = $slug_prefix . $slug;
+        }
+
         $feeds = $wp_rewrite->feeds;
         if ( ! is_array( $feeds ) )
                 $feeds = array();