From a7d80782f214a577dcc5694b18e3f14b997e4107 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Wed, 1 Dec 2010 20:03:39 +0000
Subject: [PATCH] Prevent default post formats from entering the DB. see #15629
 #15582

git-svn-id: https://develop.svn.wordpress.org/trunk@16662 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/post.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/wp-includes/post.php b/wp-includes/post.php
index 071758606d..89ce0f38e8 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -526,8 +526,14 @@ function set_post_format( $post, $format ) {
 	if ( empty($post) )
 		return new WP_Error('invalid_post', __('Invalid post'));
 
-	if ( !empty($format) )
-		$format = 'post-format-' . sanitize_key($format);
+	if ( !empty($format) ) {
+		$format = sanitize_key($format);
+		$empty_formats = array( 'post', 'default' );
+		if ( in_array( $format, $empty_formats ) )
+			$format = '';
+		else
+			$format = 'post-format-' . $format;
+	}
 
 	return wp_set_post_terms($post->ID, $format, 'post_format');
 }