Enforce leading and trailing slashes on paths updated with `update_blog_details()`

In multisite, core expects the stored value for a site's path to have leading and trailing slashes. When these slashes are missing, it becomes impossible to visit the site.

This enforces proper `/path/` creation in `update_blog_details()`, most likely used when updating an existing site through `site-info.php`.

Props earnjam, simonwheatley.

Fixes #18117. Fixes #23865.

Built from https://develop.svn.wordpress.org/trunk@31155


git-svn-id: http://core.svn.wordpress.org/trunk@31136 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-blogs.php

@@ -296,8 +296,14 @@ function update_blog_details( $blog_id, $details = array() ) {
 
 	$update_details = array();
 	$fields = array( 'site_id', 'domain', 'path', 'registered', 'last_updated', 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id');
-	foreach ( array_intersect( array_keys( $details ), $fields ) as $field )
+	foreach ( array_intersect( array_keys( $details ), $fields ) as $field ) {
+		if ( 'path' === $field ) {
+			$details[ $field ] = array_filter( explode( '/', $details[ $field ] ) );
+			$details[ $field ] = trailingslashit( '/' . implode( '/', $details[ $field ] ) );
+		}
+
 		$update_details[ $field ] = $details[ $field ];
+	}
 
 	$result = $wpdb->update( $wpdb->blogs, $update_details, array('blog_id' => $blog_id) );
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31154';
+$wp_version = '4.2-alpha-31155';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.