Notice fixes from filosofo and Viper007Bond. see #7509

git-svn-id: https://develop.svn.wordpress.org/trunk@9506 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/canonical.php

@@ -62,6 +62,10 @@ function redirect_canonical($requested_url=null, $do_redirect=true) {
 	$redirect = $original;
 	$redirect_url = false;
 
+	// Notice fixing
+	if ( !isset($redirect['path']) )  $redirect['path'] = '';
+	if ( !isset($redirect['query']) ) $redirect['query'] = '';
+
 	if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
 
 		$vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );

wp-includes/category.php

@@ -277,8 +277,10 @@ function sanitize_category_field( $field, $value, $cat_id, $context ) {
 function &get_tags( $args = '' ) {
 	$tags = get_terms( 'post_tag', $args );
 
-	if ( empty( $tags ) )
-		return array();
+	if ( empty( $tags ) ) {
+		$return = array();
+		return $return;
+	}
 
 	$tags = apply_filters( 'get_tags', $tags, $args );
 	return $tags;

wp-includes/rewrite.php

@@ -1626,10 +1626,14 @@ class WP_Rewrite {
 		}
 
 		$site_root = parse_url(get_option('siteurl'));
-		$site_root = trailingslashit($site_root['path']);
+		if ( isset( $site_root['path'] ) ) {
+			$site_root = trailingslashit($site_root['path']);
+		}
 
 		$home_root = parse_url(get_option('home'));
-		$home_root = trailingslashit($home_root['path']);
+		if ( isset( $home_root['path'] ) ) {
+			$home_root = trailingslashit($home_root['path']);
+		}
 
 		$rules = "<IfModule mod_rewrite.c>\n";
 		$rules .= "RewriteEngine On\n";

wp-includes/widgets.php

@@ -1551,6 +1551,8 @@ function wp_widget_rss_output( $rss, $args = array() ) {
 		return;
 	}
 
+	$default_args = array( 'show_author' => 0, 'show_date' => 0, 'show_summary' => 0 );
+	$args = wp_parse_args( $args, $default_args );
 	extract( $args, EXTR_SKIP );
 
 	$items = (int) $items;