diff --git a/backend.php b/backend.php
index cdad2083f..327030e32 100644
--- a/backend.php
+++ b/backend.php
@@ -1,6 +1,14 @@
 <?
 	session_start();
 
+	if ($_GET["debug"]) {
+		define('DEFAULT_ERROR_LEVEL', E_ALL);
+	} else {
+		define('DEFAULT_ERROR_LEVEL', E_ERROR | E_WARNING | E_PARSE);
+	}
+
+	error_reporting(DEFAULT_ERROR_LEVEL);
+
 	$op = $_REQUEST["op"];
 
 	if ((!$op || $op == "rpc" || $op == "globalUpdateFeeds") && !$_REQUEST["noxml"]) {
@@ -20,7 +28,7 @@
 		exit;
 	}
 
-	define(SCHEMA_VERSION, 2);
+	define('SCHEMA_VERSION', 2);
 
 	require_once "sanity_check.php";
 	require_once "config.php";
@@ -111,7 +119,7 @@
 
 			print "<label id=\"$id\" counter=\"$count\"/>";
 
-			error_reporting (E_ERROR | E_WARNING | E_PARSE);
+			error_reporting (DEFAULT_ERROR_LEVEL);
 	
 		}
 	}
@@ -227,7 +235,7 @@
 						$class .= "Unread";
 					}
 					
-					error_reporting (E_ERROR | E_WARNING | E_PARSE);
+					error_reporting (DEFAULT_ERROR_LEVEL);
 	
 					printFeedEntry(-$line["id"]-11, 
 						$class, $line["description"], $count, "images/label.png", $link);
@@ -836,7 +844,7 @@
 
 		$lnum = 0;
 
-		error_reporting (E_ERROR | E_WARNING | E_PARSE);
+		error_reporting (DEFAULT_ERROR_LEVEL);
 
 		$num_unread = 0;
 
diff --git a/config.php-dist b/config.php-dist
index 8212184c5..68c35ff44 100644
--- a/config.php-dist
+++ b/config.php-dist
@@ -2,29 +2,29 @@
 	// Your RDBMS must be configured to accept connections
 	// via TCP/IP and authentified by password.
 
-	define(DB_TYPE, "pgsql"); // or mysql
-	define(DB_HOST, "localhost");
-	define(DB_USER, "fox");
-	define(DB_NAME, "fox");
-	define(DB_PASS, "XXXXXX");
+	define('DB_TYPE', "pgsql"); // or mysql
+	define('DB_HOST', "localhost");
+	define('DB_USER', "fox");
+	define('DB_NAME', "fox");
+	define('DB_PASS', "XXXXXX");
 
 	define('MAGPIE_CACHE_DIR', '/var/tmp/magpie-ttrss-cache');
 	// Local cache directory for RSS feeds
 	
-	define(WEB_DEMO_MODE, false);
+	define('WEB_DEMO_MODE', false);
 	// Demo mode with reduced functionality.
 
-	define(ICONS_DIR, "icons");
-	define(ICONS_URL, "icons");
+	define('ICONS_DIR', "icons");
+	define('ICONS_URL', "icons");
 
-	define(USE_HTTP_AUTH, false);
+	define('USE_HTTP_AUTH', false);
 	// Use HTTP Basic authentication instead of login form. Has some problems.
 
-	define(SINGLE_USER_MODE, true);
+	define('SINGLE_USER_MODE', true);
 	// Operate in single user mode, disables all functionality related to
 	// multiple users.
 
-	define(DAEMON_REFRESH_ONLY, false);
+	define('DAEMON_REFRESH_ONLY', false);
 	// updates to all feeds will only run when the backend script is
 	// invoked with a "daemon" option on the URI stem. This is useful when you
 	// are hosting multi-user system and want to control how often 
diff --git a/functions.php b/functions.php
index ed2910a2a..e479c28b7 100644
--- a/functions.php
+++ b/functions.php
@@ -1,6 +1,12 @@
 <?
 	session_start();
 
+	if ($_GET["debug"]) {
+		define('DEFAULT_ERROR_LEVEL', E_ALL);
+	} else {
+		define('DEFAULT_ERROR_LEVEL', E_ERROR | E_WARNING | E_PARSE);
+	}
+
 	require_once 'config.php';
 	require_once 'db-prefs.php';
 
@@ -130,7 +136,7 @@
 				
 			error_reporting(0);
 			$r = fopen($icon_url, "r");
-			error_reporting (E_ERROR | E_WARNING | E_PARSE);
+			error_reporting (DEFAULT_ERROR_LEVEL);
 
 			if ($r) {
 				$tmpfname = tempnam("/tmp", "ttrssicon");
@@ -152,7 +158,7 @@
 
 				chmod($icon_file, 0644);
 				
-				error_reporting (E_ERROR | E_WARNING | E_PARSE);
+				error_reporting (DEFAULT_ERROR_LEVEL);
 
 			}	
 		}
@@ -167,7 +173,7 @@
 		error_reporting(0);
 		$rss = fetch_rss($feed_url);
 
-		error_reporting (E_ERROR | E_WARNING | E_PARSE);
+		error_reporting (DEFAULT_ERROR_LEVEL);
 
 		db_query($link, "BEGIN");
 
@@ -352,7 +358,7 @@
 						if (is_filtered($entry_title, $entry_content, $entry_link, $filters)) {
 							continue;
 						}
-						error_reporting (E_ERROR | E_WARNING | E_PARSE);
+						error_reporting (DEFAULT_ERROR_LEVEL);
 
 						$result = db_query($link,
 							"SELECT ref_id FROM ttrss_user_entries WHERE