diff --git a/wp-admin/includes/nav-menu.php b/wp-admin/includes/nav-menu.php
index f8adbf26ff..fe588cd461 100644
--- a/wp-admin/includes/nav-menu.php
+++ b/wp-admin/includes/nav-menu.php
@@ -1252,7 +1252,7 @@ add_action('admin_head-nav-menus.php', '_wp_delete_orphaned_draft_menu_items');
  */
 function wp_nav_menu_update_menu_items ( $nav_menu_selected_id, $nav_menu_selected_title ) {
 	$unsorted_menu_items = wp_get_nav_menu_items( $nav_menu_selected_id, array( 'orderby' => 'ID', 'output' => ARRAY_A, 'output_key' => 'ID', 'post_status' => 'draft,publish' ) );
-
+	$messages = array();
 	$menu_items = array();
 	// Index menu items by db ID
 	foreach ( $unsorted_menu_items as $_item )
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index 425e40b0f0..b3e7b61675 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -301,11 +301,14 @@ function wp_popular_terms_checklist( $taxonomy, $default = 0, $number = 10, $ech
 function wp_link_category_checklist( $link_id = 0 ) {
 	$default = 1;
 
+	$checked_categories = array();
+
 	if ( $link_id ) {
 		$checked_categories = wp_get_link_cats( $link_id );
 		// No selected categories, strange
-		if ( ! count( $checked_categories ) )
+		if ( ! count( $checked_categories ) ) {
 			$checked_categories[] = $default;
+		}
 	} else {
 		$checked_categories[] = $default;
 	}
diff --git a/wp-admin/includes/theme.php b/wp-admin/includes/theme.php
index 1bc7212bb1..8c2c678eca 100644
--- a/wp-admin/includes/theme.php
+++ b/wp-admin/includes/theme.php
@@ -430,6 +430,9 @@ function wp_prepare_themes_for_js( $themes = null ) {
 	}
 
 	WP_Theme::sort_by_name( $themes );
+
+	$parents = array();
+
 	foreach ( $themes as $theme ) {
 		$slug = $theme->get_stylesheet();
 		$encoded_slug = urlencode( $slug );
@@ -469,7 +472,7 @@ function wp_prepare_themes_for_js( $themes = null ) {
 	}
 
 	// Remove 'delete' action if theme has an active child
-	if ( isset( $parents ) && array_key_exists( $current_theme, $parents ) ) {
+	if ( ! empty( $parents ) && array_key_exists( $current_theme, $parents ) ) {
 		unset( $prepared_themes[ $parents[ $current_theme ] ]['actions']['delete'] );
 	}
 
diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index 15a1097fe8..b72303afa7 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -1786,7 +1786,7 @@ function dbDelta( $queries = '', $execute = true ) {
 
 		if ($tableindices) {
 			// Clear the index array.
-			unset($index_ary);
+			$index_ary = array();
 
 			// For every index in the table.
 			foreach ($tableindices as $tableindex) {
diff --git a/wp-includes/category-template.php b/wp-includes/category-template.php
index 0f97068ff9..6048432f22 100644
--- a/wp-includes/category-template.php
+++ b/wp-includes/category-template.php
@@ -1289,11 +1289,14 @@ function get_the_term_list( $id, $taxonomy, $before = '', $sep = '', $after = ''
 	if ( empty( $terms ) )
 		return false;
 
+	$links = array();
+
 	foreach ( $terms as $term ) {
 		$link = get_term_link( $term, $taxonomy );
-		if ( is_wp_error( $link ) )
+		if ( is_wp_error( $link ) ) {
 			return $link;
-		$term_links[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>';
+		}
+		$links[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>';
 	}
 
 	/**
@@ -1304,9 +1307,9 @@ function get_the_term_list( $id, $taxonomy, $before = '', $sep = '', $after = ''
 	 *
 	 * @since 2.5.0
 	 *
-	 * @param array $term_links An array of term links.
+	 * @param array $links An array of term links.
 	 */
-	$term_links = apply_filters( "term_links-$taxonomy", $term_links );
+	$term_links = apply_filters( "term_links-$taxonomy", $links );
 
 	return $before . join( $sep, $term_links ) . $after;
 }
diff --git a/wp-includes/default-widgets.php b/wp-includes/default-widgets.php
index 1bdadd8ee2..180e0744d9 100644
--- a/wp-includes/default-widgets.php
+++ b/wp-includes/default-widgets.php
@@ -1266,6 +1266,7 @@ class WP_Widget_Tag_Cloud extends WP_Widget {
 	}
 
 	public function update( $new_instance, $old_instance ) {
+		$instance = array();
 		$instance['title'] = strip_tags(stripslashes($new_instance['title']));
 		$instance['taxonomy'] = stripslashes($new_instance['taxonomy']);
 		return $instance;
diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 3d4d1f20c7..ea22c4d805 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -1022,6 +1022,7 @@ function remove_accents($string) {
 
 		$string = strtr($string, $chars);
 	} else {
+		$chars = array();
 		// Assume ISO-8859-1 if not UTF-8
 		$chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158)
 			.chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194)
@@ -1037,6 +1038,7 @@ function remove_accents($string) {
 		$chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy";
 
 		$string = strtr($string, $chars['in'], $chars['out']);
+		$double_chars = array();
 		$double_chars['in'] = array(chr(140), chr(156), chr(198), chr(208), chr(222), chr(223), chr(230), chr(240), chr(254));
 		$double_chars['out'] = array('OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th');
 		$string = str_replace($double_chars['in'], $double_chars['out'], $string);
diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index 8655ceed21..5136a53617 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -1438,7 +1438,6 @@ function wp_get_archives( $args = '' ) {
 		$key = "wp_get_archives:$key:$last_changed";
 		if ( ! $results = wp_cache_get( $key, 'posts' ) ) {
 			$results = $wpdb->get_results( $query );
-			$cache[ $key ] = $results;
 			wp_cache_set( $key, $results, 'posts' );
 		}
 		if ( $results ) {
@@ -1657,6 +1656,8 @@ function get_calendar($initial = true, $echo = true) {
 	<tbody>
 	<tr>';
 
+	$daywithpost = array();
+
 	// Get days with posts
 	$dayswithposts = $wpdb->get_results("SELECT DISTINCT DAYOFMONTH(post_date)
 		FROM $wpdb->posts WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00'
@@ -1666,8 +1667,6 @@ function get_calendar($initial = true, $echo = true) {
 		foreach ( (array) $dayswithposts as $daywith ) {
 			$daywithpost[] = $daywith[0];
 		}
-	} else {
-		$daywithpost = array();
 	}
 
 	if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'camino') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'safari') !== false)
diff --git a/wp-includes/media.php b/wp-includes/media.php
index c7d092d966..c02aabcf59 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -586,6 +586,8 @@ function image_get_intermediate_size($post_id, $size='thumbnail') {
 
 	// get the best one for a specified set of dimensions
 	if ( is_array($size) && !empty($imagedata['sizes']) ) {
+		$areas = array();
+
 		foreach ( $imagedata['sizes'] as $_size => $data ) {
 			// already cropped to width or height; so use this size
 			if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
diff --git a/wp-includes/ms-deprecated.php b/wp-includes/ms-deprecated.php
index ffd65ca821..1a0b253242 100644
--- a/wp-includes/ms-deprecated.php
+++ b/wp-includes/ms-deprecated.php
@@ -166,20 +166,21 @@ function get_blog_list( $start = 0, $num = 10, $deprecated = '' ) {
 	global $wpdb;
 	$blogs = $wpdb->get_results( $wpdb->prepare("SELECT blog_id, domain, path FROM $wpdb->blogs WHERE site_id = %d AND public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0' ORDER BY registered DESC", $wpdb->siteid), ARRAY_A );
 
+	$blog_list = array();
 	foreach ( (array) $blogs as $details ) {
 		$blog_list[ $details['blog_id'] ] = $details;
 		$blog_list[ $details['blog_id'] ]['postcount'] = $wpdb->get_var( "SELECT COUNT(ID) FROM " . $wpdb->get_blog_prefix( $details['blog_id'] ). "posts WHERE post_status='publish' AND post_type='post'" );
 	}
-	unset( $blogs );
-	$blogs = $blog_list;
 
-	if ( false == is_array( $blogs ) )
+	if ( ! $blog_list ) {
 		return array();
+	}
 
-	if ( $num == 'all' )
-		return array_slice( $blogs, $start, count( $blogs ) );
-	else
-		return array_slice( $blogs, $start, $num );
+	if ( $num == 'all' ) {
+		return array_slice( $blog_list, $start, count( $blog_list ) );
+	} else {
+		return array_slice( $blog_list, $start, $num );
+	}
 }
 
 /**
diff --git a/wp-includes/ms-load.php b/wp-includes/ms-load.php
index 652b190962..6e3344e391 100644
--- a/wp-includes/ms-load.php
+++ b/wp-includes/ms-load.php
@@ -308,6 +308,8 @@ function get_site_by_path( $domain, $path, $segments = null ) {
 		$path_segments = array_slice( $path_segments, 0, $segments );
 	}
 
+	$paths = array();
+
 	while ( count( $path_segments ) ) {
 		$paths[] = '/' . implode( '/', $path_segments ) . '/';
 		array_pop( $path_segments );
diff --git a/wp-includes/post.php b/wp-includes/post.php
index c8963e6b2d..d8c8c55542 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -352,12 +352,16 @@ function get_children( $args = '', $output = OBJECT ) {
 	if ( $output == OBJECT ) {
 		return $kids;
 	} elseif ( $output == ARRAY_A ) {
-		foreach ( (array) $kids as $kid )
+		$weeuns = array();
+		foreach ( (array) $kids as $kid ) {
 			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
+		}
 		return $weeuns;
 	} elseif ( $output == ARRAY_N ) {
-		foreach ( (array) $kids as $kid )
+		$babes = array();
+		foreach ( (array) $kids as $kid ) {
 			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
+		}
 		return $babes;
 	} else {
 		return $kids;
@@ -1681,9 +1685,10 @@ function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
 	if ( !isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) )
 		$object->labels['all_items'] = $object->labels['menu_name'];
 
-	foreach ( $nohier_vs_hier_defaults as $key => $value )
-			$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
-
+	$defaults = array();
+	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
+		$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
+	}
 	$labels = array_merge( $defaults, $object->labels );
 	return (object)$labels;
 }
@@ -2510,6 +2515,9 @@ function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
 	$wildcards = array('', '%', '%/%');
 	if ( is_string($post_mime_types) )
 		$post_mime_types = array_map('trim', explode(',', $post_mime_types));
+
+	$wheres = array();
+
 	foreach ( (array) $post_mime_types as $mime_type ) {
 		$mime_type = preg_replace('/\s/', '', $mime_type);
 		$slashpos = strpos($mime_type, '/');
@@ -5140,6 +5148,7 @@ function wp_mime_type_icon( $mime = 0 ) {
 			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
 		}
 
+		$types = array();
 		// Icon basename - extension = MIME wildcard.
 		foreach ( $icon_files as $file => $uri )
 			$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];
@@ -5513,9 +5522,11 @@ function update_post_caches( &$posts, $post_type = 'post', $update_term_cache =
 		if ( is_array($post_type) ) {
 			$ptypes = $post_type;
 		} elseif ( 'any' == $post_type ) {
+			$ptypes = array();
 			// Just use the post_types in the supplied posts.
-			foreach ( $posts as $post )
+			foreach ( $posts as $post ) {
 				$ptypes[] = $post->post_type;
+			}
 			$ptypes = array_unique($ptypes);
 		} else {
 			$ptypes = array($post_type);
diff --git a/wp-includes/rewrite.php b/wp-includes/rewrite.php
index 9bc167f08f..23595ef1a3 100644
--- a/wp-includes/rewrite.php
+++ b/wp-includes/rewrite.php
@@ -1288,6 +1288,7 @@ class WP_Rewrite {
 		$trackbackindex = $index;
 		//build a list from the rewritecode and queryreplace arrays, that will look something like
 		//tagname=$matches[i] where i is the current $i
+		$queries = array();
 		for ( $i = 0; $i < $num_tokens; ++$i ) {
 			if ( 0 < $i )
 				$queries[$i] = $queries[$i - 1] . '&';
@@ -1328,7 +1329,7 @@ class WP_Rewrite {
 			$num_toks = preg_match_all('/%.+?%/', $struct, $toks);
 
 			//get the 'tagname=$matches[i]'
-			$query = ( isset($queries) && is_array($queries) && !empty($num_toks) ) ? $queries[$num_toks - 1] : '';
+			$query = ( ! empty( $num_toks ) && isset( $queries[$num_toks - 1] ) ) ? $queries[$num_toks - 1] : '';
 
 			//set up $ep_mask_specific which is used to match more specific URL types
 			switch ( $dirs[$j] ) {
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index 1d93f69047..7d49a543e7 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -3889,6 +3889,8 @@ function _pad_term_counts(&$terms, $taxonomy) {
 		return;
 
 	$term_items = array();
+	$terms_by_id = array();
+	$term_ids = array();
 
 	foreach ( (array) $terms as $key => $term ) {
 		$terms_by_id[$term->term_id] = & $terms[$key];
diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index f8539e9f8f..4a8d342fde 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -406,6 +406,7 @@ function search_theme_directories( $force = false ) {
 	$found_themes = array();
 
 	$wp_theme_directories = (array) $wp_theme_directories;
+	$relative_theme_roots = array();
 
 	// Set up maybe-relative, maybe-absolute array of theme directories.
 	// We always want to return absolute, but we need to cache relative