diff --git a/classes/article.php b/classes/article.php
index 398132d12..f796bf630 100644
--- a/classes/article.php
+++ b/classes/article.php
@@ -30,7 +30,6 @@ class Article extends Handler_Protected {
 		$id = $this->dbh->escape_string($_REQUEST["id"]);
 		$cids = explode(",", $this->dbh->escape_string($_REQUEST["cids"]));
 		$mode = $this->dbh->escape_string($_REQUEST["mode"]);
-		$omode = $this->dbh->escape_string($_REQUEST["omode"]);
 
 		// in prefetch mode we only output requested cids, main article
 		// just gets marked as read (it already exists in client cache)
diff --git a/classes/dlg.php b/classes/dlg.php
index d1b5745e7..25a194bed 100644
--- a/classes/dlg.php
+++ b/classes/dlg.php
@@ -16,7 +16,6 @@ class Dlg extends Handler_Protected {
 		print __("If you have imported labels and/or filters, you might need to reload preferences to see your new data.") . "</p>";
 
 		print "<div class=\"prefFeedOPMLHolder\">";
-		$owner_uid = $_SESSION["uid"];
 
 		$this->dbh->query("BEGIN");
 
diff --git a/classes/feeds.php b/classes/feeds.php
index 8d4c052dc..ea3967911 100644
--- a/classes/feeds.php
+++ b/classes/feeds.php
@@ -13,12 +13,6 @@ class Feeds extends Handler_Protected {
 			$feed_id, $is_cat, $search,
 			$search_mode, $view_mode, $error, $feed_last_updated) {
 
-		$page_prev_link = "viewFeedGoPage(-1)";
-		$page_next_link = "viewFeedGoPage(1)";
-		$page_first_link = "viewFeedGoPage(0)";
-
-		$catchup_page_link = "catchupPage()";
-		$catchup_feed_link = "catchupCurrentFeed()";
 		$catchup_sel_link = "catchupSelection()";
 
 		$archive_sel_link = "archiveSelection()";
@@ -292,8 +286,6 @@ class Feeds extends Handler_Protected {
 			$num_unread = 0;
 			$cur_feed_title = '';
 
-			$fresh_intl = get_pref("FRESH_ARTICLE_MAX_AGE") * 60 * 60;
-
 			if ($_REQUEST["debug"]) $timing_info = print_checkpoint("PS", $timing_info);
 
 			$expand_cdm = get_pref('CDM_EXPANDED');
@@ -557,7 +549,7 @@ class Feeds extends Handler_Protected {
 					$reply['content'] .= "<div class=\"cdm $hlc_suffix $expanded_class $class\"
 						id=\"RROW-$id\" orig-feed-id='$feed_id' $mouseover_attrs>";
 
-					$reply['content'] .= "<div class=\"cdmHeader\" style=\"$row_background\">";
+					$reply['content'] .= "<div class=\"cdmHeader\">";
 					$reply['content'] .= "<div style=\"vertical-align : middle\">";
 
 					$reply['content'] .= "<input dojoType=\"dijit.form.CheckBox\"
@@ -811,8 +803,6 @@ class Feeds extends Handler_Protected {
 
 		if ($_REQUEST["debug"]) $timing_info = print_checkpoint("0", $timing_info);
 
-		$omode = $this->dbh->escape_string($_REQUEST["omode"]);
-
 		$feed = $this->dbh->escape_string($_REQUEST["feed"]);
 		$method = $this->dbh->escape_string($_REQUEST["m"]);
 		$view_mode = $this->dbh->escape_string($_REQUEST["view_mode"]);
@@ -905,7 +895,7 @@ class Feeds extends Handler_Protected {
 
 		//$topmost_article_ids = $ret[0];
 		$headlines_count = $ret[1];
-		$returned_feed = $ret[2];
+		/* $returned_feed = $ret[2]; */
 		$disable_cache = $ret[3];
 		$vgroup_last_feed = $ret[4];
 
@@ -1085,20 +1075,18 @@ class Feeds extends Handler_Protected {
 		print " <select dojoType=\"dijit.form.Select\" name=\"limit\" onchange=\"dijit.byId('feedBrowserDlg').update()\">";
 
 		foreach (array(25, 50, 100, 200) as $l) {
-			$issel = ($l == $limit) ? "selected=\"1\"" : "";
-			print "<option $issel value=\"$l\">$l</option>";
+			//$issel = ($l == $limit) ? "selected=\"1\"" : "";
+			print "<option value=\"$l\">$l</option>";
 		}
 
 		print "</select> ";
 
 		print "</div>";
 
-		$owner_uid = $_SESSION["uid"];
-
 		require_once "feedbrowser.php";
 
 		print "<ul class='browseFeedList' id='browseFeedList'>";
-		print make_feed_browser($search, 25);
+		print make_feed_browser("", 25);
 		print "</ul>";
 
 		print "<div align='center'>
diff --git a/classes/handler/public.php b/classes/handler/public.php
index 32c25b511..383654df3 100644
--- a/classes/handler/public.php
+++ b/classes/handler/public.php
@@ -67,7 +67,7 @@ class Handler_Public extends Handler {
 		$result = $qfh_ret[0];
 		$feed_title = htmlspecialchars($qfh_ret[1]);
 		$feed_site_url = $qfh_ret[2];
-		$last_error = $qfh_ret[3];
+		/* $last_error = $qfh_ret[3]; */
 
 		$feed_self_url = get_self_url_prefix() .
 			"/public.php?op=rss&id=$feed&key=" .
@@ -404,17 +404,17 @@ class Handler_Public extends Handler {
 	}
 
 	function updateTask() {
-		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_UPDATE_TASK, "hook_update_task", $op);
+		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_UPDATE_TASK, "hook_update_task", false);
 	}
 
 	function housekeepingTask() {
-		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_HOUSE_KEEPING, "hook_house_keeping", $op);
+		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_HOUSE_KEEPING, "hook_house_keeping", false);
 	}
 
 	function globalUpdateFeeds() {
 		RPC::updaterandomfeed_real($this->dbh);
 
-		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_UPDATE_TASK, "hook_update_task", $op);
+		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_UPDATE_TASK, "hook_update_task", false);
 	}
 
 	function sharepopup() {
@@ -692,7 +692,7 @@ class Handler_Public extends Handler {
 	function subscribe2() {
 		$feed_url = $this->dbh->escape_string(trim($_REQUEST["feed_url"]));
 		$cat_id = $this->dbh->escape_string($_REQUEST["cat_id"]);
-		$from = $this->dbh->escape_string($_REQUEST["from"]);
+		/* $from = $this->dbh->escape_string($_REQUEST["from"]); */
 		$feed_urls = array();
 
 		/* only read authentication information from POST */
diff --git a/classes/pref/feeds.php b/classes/pref/feeds.php
index 4c51d220c..7d541ded1 100644
--- a/classes/pref/feeds.php
+++ b/classes/pref/feeds.php
@@ -395,7 +395,7 @@ class Pref_Feeds extends Handler_Protected {
 #		print_r($data['items']);
 
 		if (is_array($data) && is_array($data['items'])) {
-			$cat_order_id = 0;
+#			$cat_order_id = 0;
 
 			$data_map = array();
 			$root_item = false;
@@ -962,7 +962,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		if (!$batch) {
 
-			$result = $this->dbh->query("UPDATE ttrss_feeds SET
+			$this->dbh->query("UPDATE ttrss_feeds SET
 				$category_qpart
 				title = '$feed_title', feed_url = '$feed_link',
 				update_interval = '$upd_intl',
@@ -1573,8 +1573,6 @@ class Pref_Feeds extends Handler_Protected {
 			# class needed for selectTableRows()
 			print "<tr class=\"placeholder\" $this_row_id>";
 
-			$edit_title = htmlspecialchars($line["title"]);
-
 			# id needed for selectTableRows()
 			print "<td width='5%' align='center'><input
 				onclick='toggleSelectRow2(this);' dojoType=\"dijit.form.CheckBox\"
@@ -1639,8 +1637,6 @@ class Pref_Feeds extends Handler_Protected {
 			# class needed for selectTableRows()
 			print "<tr class=\"placeholder\" $this_row_id>";
 
-			$edit_title = htmlspecialchars($line["title"]);
-
 			# id needed for selectTableRows()
 			print "<td width='5%' align='center'><input
 				onclick='toggleSelectRow2(this);' dojoType=\"dijit.form.CheckBox\"
diff --git a/classes/pref/filters.php b/classes/pref/filters.php
index 43da6d04d..2e1e841fc 100644
--- a/classes/pref/filters.php
+++ b/classes/pref/filters.php
@@ -88,7 +88,6 @@ class Pref_Filters extends Handler_Protected {
 
 		$result = $qfh_ret[0];
 
-		$articles = array();
 		$found = 0;
 
 		print __("Articles matching this filter:");
@@ -103,9 +102,6 @@ class Pref_Filters extends Handler_Protected {
 					$line = $p->hook_query_headlines($line, 100);
 				}
 
-			$entry_timestamp = strtotime($line["updated"]);
-			$entry_tags = get_article_tags($line["id"], $_SESSION["uid"]);
-
 			$content_preview = $line["content_preview"];
 
 			if ($line["feed_title"])
@@ -174,24 +170,11 @@ class Pref_Filters extends Handler_Protected {
 			owner_uid = ".$_SESSION["uid"]." ORDER BY order_id, title");
 
 
-		$action_id = -1;
 		$folder = array();
 		$folder['items'] = array();
 
 		while ($line = $this->dbh->fetch_assoc($result)) {
 
-			/* if ($action_id != $line["action_id"]) {
-				if (count($folder['items']) > 0) {
-					array_push($root['items'], $folder);
-				}
-
-				$folder = array();
-				$folder['id'] = $line["action_id"];
-				$folder['name'] = __($line["action_name"]);
-				$folder['items'] = array();
-				$action_id = $line["action_id"];
-			} */
-
 			$name = $this->getFilterName($line["id"]);
 
 			$match_ok = false;
@@ -471,7 +454,7 @@ class Pref_Filters extends Handler_Protected {
 		$inverse = checkbox_to_sql_bool($this->dbh->escape_string($_REQUEST["inverse"]));
 		$title = $this->dbh->escape_string($_REQUEST["title"]);
 
-		$result = $this->dbh->query("UPDATE ttrss_filters2 SET enabled = $enabled,
+		$this->dbh->query("UPDATE ttrss_filters2 SET enabled = $enabled,
 			match_any_rule = $match_any_rule,
 			inverse = $inverse,
 			title = '$title'
diff --git a/classes/pref/prefs.php b/classes/pref/prefs.php
index 3e7d467fa..1fb40a0d6 100644
--- a/classes/pref/prefs.php
+++ b/classes/pref/prefs.php
@@ -887,7 +887,6 @@ class Pref_Prefs extends Handler_Protected {
 
 		if (!$otp_enabled) {
 			$secret = $base32->encode(sha1($this->dbh->fetch_result($result, 0, "salt")));
-			$topt = new \OTPHP\TOTP($secret);
 	      print QRcode::png("otpauth://totp/".urlencode($login).
 				"?secret=$secret&issuer=".urlencode("Tiny Tiny RSS"));
 
diff --git a/classes/rpc.php b/classes/rpc.php
index 7d55e6ba8..b4de44a74 100644
--- a/classes/rpc.php
+++ b/classes/rpc.php
@@ -95,7 +95,7 @@ class RPC extends Handler_Protected {
 							WHERE orig_feed_id = '$id') = 0 AND
 		id = '$id' AND owner_uid = ".$_SESSION["uid"]);
 
-			$rc = $this->dbh->affected_rows($result);
+			$this->dbh->affected_rows($result);
 		}
 	}
 
@@ -138,7 +138,7 @@ class RPC extends Handler_Protected {
 			$mark = "false";
 		}
 
-		$result = $this->dbh->query("UPDATE ttrss_user_entries SET marked = $mark,
+		$this->dbh->query("UPDATE ttrss_user_entries SET marked = $mark,
 					last_marked = NOW()
 					WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 
@@ -148,8 +148,8 @@ class RPC extends Handler_Protected {
 	function delete() {
 		$ids = $this->dbh->escape_string($_REQUEST["ids"]);
 
-		$result = $this->dbh->query("DELETE FROM ttrss_user_entries
-		WHERE ref_id IN ($ids) AND owner_uid = " . $_SESSION["uid"]);
+		$this->dbh->query("DELETE FROM ttrss_user_entries
+			WHERE ref_id IN ($ids) AND owner_uid = " . $_SESSION["uid"]);
 
 		purge_orphans();
 
@@ -258,7 +258,6 @@ class RPC extends Handler_Protected {
 	function publ() {
 		$pub = $_REQUEST["pub"];
 		$id = $this->dbh->escape_string($_REQUEST["id"]);
-		$note = trim(strip_tags($this->dbh->escape_string($_REQUEST["note"])));
 
 		if ($pub == "1") {
 			$pub = "true";
@@ -266,7 +265,7 @@ class RPC extends Handler_Protected {
 			$pub = "false";
 		}
 
-		$result = $this->dbh->query("UPDATE ttrss_user_entries SET
+		$this->dbh->query("UPDATE ttrss_user_entries SET
 			published = $pub, last_published = NOW()
 			WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 
@@ -620,7 +619,7 @@ class RPC extends Handler_Protected {
 
 			$p = new Publisher(PUBSUBHUBBUB_HUB);
 
-			$pubsub_result = $p->publish_update($rss_link);
+			/* $pubsub_result = */ $p->publish_update($rss_link);
 		}
 	}
 
diff --git a/include/digest.php b/include/digest.php
index 4427936e5..71ee6d203 100644
--- a/include/digest.php
+++ b/include/digest.php
@@ -127,8 +127,6 @@
 			ORDER BY ttrss_feed_categories.title, ttrss_feeds.title, score DESC, date_updated DESC
 			LIMIT $limit");
 
-		$cur_feed_title = "";
-
 		$headlines_count = db_num_rows($result);
 
 		$headlines = array();
diff --git a/include/feedbrowser.php b/include/feedbrowser.php
index d35f1ebf8..8907aa9e4 100644
--- a/include/feedbrowser.php
+++ b/include/feedbrowser.php
@@ -63,7 +63,7 @@
 				htmlspecialchars($line["title"])."</span></a>";
 
 				$feed_url = "<a target=\"_blank\" class=\"fb_feedUrl\"
-							href=\"$feed_url\"><img src='images/pub_set.svg'
+							href=\"$feed_url\"><img src='images/pub_set.png'
 							style='vertical-align : middle'></a>";
 
 				$rv .= "<li>$check_box $feed_url $site_url".
@@ -72,7 +72,6 @@
 			} else if ($mode == 2) {
 				$feed_url = htmlspecialchars($line["feed_url"]);
 				$site_url = htmlspecialchars($line["site_url"]);
-				$title = htmlspecialchars($line["title"]);
 
 				$check_box = "<input onclick='toggleSelectListRow2(this)' dojoType=\"dijit.form.CheckBox\"
 							type=\"checkbox\">";
@@ -92,7 +91,7 @@
 				htmlspecialchars($line["title"])."</span></a>";
 
 				$feed_url = "<a target=\"_blank\" class=\"fb_feedUrl\"
-							href=\"$feed_url\"><img src='images/pub_set.svg'
+							href=\"$feed_url\"><img src='images/pub_set.png'
 							style='vertical-align : middle'></a>";
 
 
diff --git a/include/functions.php b/include/functions.php
index 8e8832a58..48f6218e1 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -1613,7 +1613,6 @@
 				AND ttrss_counters_cache.feed_id = id";
 
 		$result = db_query($query);
-		$fctrs_modified = false;
 
 		while ($line = db_fetch_assoc($result)) {
 
@@ -2922,7 +2921,6 @@
 
 					$fragment = $doc->createDocumentFragment();
 					$text = $child->textContent;
-					$stubs = array();
 
 					while (($pos = mb_stripos($text, $word)) !== false) {
 						$fragment->appendChild(new DomText(mb_substr($text, 0, $pos)));
@@ -3104,19 +3102,16 @@
 	}
 
 	function format_warning($msg, $id = "") {
-		global $link;
 		return "<div class=\"warning\" id=\"$id\">
 			<span><img src=\"images/alert.png\"></span><span>$msg</span></div>";
 	}
 
 	function format_notice($msg, $id = "") {
-		global $link;
 		return "<div class=\"notice\" id=\"$id\">
 			<span><img src=\"images/information.png\"></span><span>$msg</span></div>";
 	}
 
 	function format_error($msg, $id = "") {
-		global $link;
 		return "<div class=\"error\" id=\"$id\">
 			<span><img src=\"images/alert.png\"></span><span>$msg</span></div>";
 	}
@@ -3225,8 +3220,6 @@
 
 			$line = db_fetch_assoc($result);
 
-			$tag_cache = $line["tag_cache"];
-
 			$line["tags"] = get_article_tags($id, $owner_uid, $line["tag_cache"]);
 			unset($line["tag_cache"]);
 
@@ -3382,7 +3375,7 @@
 					$rv['content'] .= "&nbsp;";
 
 					$rv['content'] .= "<a target='_blank' href='" . htmlspecialchars($tmp_line['feed_url']) . "'>";
-					$rv['content'] .= "<img title='".__('Feed URL')."'class='tinyFeedIcon' src='images/pub_set.svg'></a>";
+					$rv['content'] .= "<img title='".__('Feed URL')."' class='tinyFeedIcon' src='images/pub_set.png'></a>";
 
 					$rv['content'] .= "</div>";
 				}
@@ -4268,9 +4261,9 @@
 			$fetch_last_error = curl_errno($curl) . " " . curl_error($curl);
 			curl_close($curl);
 
-			$oline='';
-			foreach($status as $key=>$eline){$oline.='['.$key.']'.$eline.' ';}
-			$line =$oline." \r\n ".$url."\r\n-----------------\r\n";
+#			$oline='';
+#			foreach($status as $key=>$eline){$oline.='['.$key.']'.$eline.' ';}
+#			$line =$oline." \r\n ".$url."\r\n-----------------\r\n";
 #			$handle = @fopen('./curl.error.log', 'a');
 #			fwrite($handle, $line);
 			return FALSE;
diff --git a/include/labels.php b/include/labels.php
index 6e0bfcb98..4149864b3 100644
--- a/include/labels.php
+++ b/include/labels.php
@@ -109,7 +109,7 @@
 
 		if (!$label_id) return;
 
-		$result = db_query(
+		db_query(
 			"DELETE FROM ttrss_user_labels2
 			WHERE
 				label_id = '$label_id' AND