diff --git a/html/billing-graph.php b/html/billing-graph.php
index b7d9c6200..7545b8719 100644
--- a/html/billing-graph.php
+++ b/html/billing-graph.php
@@ -112,7 +112,7 @@ if ($count <= 1) {
 $i = '0';
 
 foreach (dbFetch('SELECT *, UNIX_TIMESTAMP(timestamp) AS formatted_date FROM bill_data WHERE bill_id = ? AND `timestamp` >= FROM_UNIXTIME( ? ) AND `timestamp` <= FROM_UNIXTIME( ? ) ORDER BY timestamp ASC', array($bill_id, $start, $end)) as $row) {
-    @$timestamp = $row['formatted_date'];
+    $timestamp = $row['formatted_date'];
     if (!$first) {
         $first = $timestamp;
     }
diff --git a/html/csv.php b/html/csv.php
index 19203237d..cbd77fe5f 100644
--- a/html/csv.php
+++ b/html/csv.php
@@ -37,7 +37,7 @@ require 'includes/authenticate.inc.php';
 
 $report = mres($vars['report']);
 if (!empty($report) && file_exists("includes/reports/$report.csv.inc.php")) {
-    if ($debug == false) {
+    if ($debug === false) {
         header('Content-Type: text/csv');
         header('Content-Disposition: attachment; filename="'.$report.'-'.date('Ymd').'.csv"');
     }
diff --git a/html/includes/PasswordHash.php b/html/includes/PasswordHash.php
index 757d47d55..914ab2e4d 100644
--- a/html/includes/PasswordHash.php
+++ b/html/includes/PasswordHash.php
@@ -47,8 +47,6 @@ class PasswordHash {
 
 	function get_random_bytes($count)
 	{
-		$output = '';
-		
 		$output = openssl_random_pseudo_bytes($count,$strong);
 		
 		if(empty($output))
diff --git a/html/includes/functions.inc.php b/html/includes/functions.inc.php
index 6aed9fa6f..0b62367cf 100644
--- a/html/includes/functions.inc.php
+++ b/html/includes/functions.inc.php
@@ -673,6 +673,7 @@ function overlibprint($text) {
 
 
 function humanmedia($media) {
+    global $rewrite_iftype;
     array_preg_replace($rewrite_iftype, $media);
     return $media;
 
@@ -825,7 +826,7 @@ function generate_ap_link($args, $text=null, $type=null) {
 
     $url = generate_ap_url($args);
     if (port_permitted($args['interface_id'], $args['device_id'])) {
-        return overlib_link($url, $text, $content, $class);
+        return overlib_link($url, $text, $content, null);
     }
     else {
         return fixifName($text);
diff --git a/html/includes/graphs/device/collectd.inc.php b/html/includes/graphs/device/collectd.inc.php
index 7de642433..b15c1a89e 100644
--- a/html/includes/graphs/device/collectd.inc.php
+++ b/html/includes/graphs/device/collectd.inc.php
@@ -94,6 +94,7 @@ function error($code, $code_msg, $title, $msg) {
     imagestring($png, 5, 60, 35, sprintf('%s [%d]', $code_msg, $code), $c_etxt);
     if (function_exists('imagettfbbox') && is_file($config['error_font'])) {
         // Detailled error message
+        $errorfont = $config['error_font'];
         $fmt_msg = makeTextBlock($msg, $errorfont, 10, ($w - 86));
         $fmtbox  = imagettfbbox(12, 0, $errorfont, $fmt_msg);
         imagettftext($png, 10, 0, 55, (35 + 3 + imagefontwidth(5) - $fmtbox[7] + $fmtbox[1]), $c_txt, $errorfont, $fmt_msg);
@@ -274,7 +275,7 @@ else if ($rrd_cmd) {
     header('Cache-Control: max-age=60');
     $rt = 0;
     passthru($rrd_cmd, $rt);
-    if ($rt != 0) {
+    if ($rt !== 0) {
         return error500($graph_identifier, 'RRD failed to generate the graph: '.$rt);
     }
 
diff --git a/html/includes/graphs/device/toner.inc.php b/html/includes/graphs/device/toner.inc.php
index 9ba469cc0..bd132c4e6 100644
--- a/html/includes/graphs/device/toner.inc.php
+++ b/html/includes/graphs/device/toner.inc.php
@@ -7,7 +7,7 @@ $rrd_options .= ' -l 0 -E ';
 $iter         = '1';
 $rrd_options .= " COMMENT:'Toner level            Cur     Min      Max\\n'";
 foreach (dbFetchRows('SELECT * FROM toner where device_id = ?', array($device['device_id'])) as $toner) {
-    $colour = toner2colour($toner['toner_descr']);
+    $colour = toner2colour($toner['toner_descr'], 100 - $toner['toner_current']);
 
     if ($colour['left'] == null) {
         // FIXME generic colour function
diff --git a/html/includes/graphs/toner/usage.inc.php b/html/includes/graphs/toner/usage.inc.php
index 2b617eb8b..274845db7 100644
--- a/html/includes/graphs/toner/usage.inc.php
+++ b/html/includes/graphs/toner/usage.inc.php
@@ -6,7 +6,7 @@ require 'includes/graphs/common.inc.php';
 
 $rrd_options .= " COMMENT:'                                 Cur    Max\\n'";
 
-$colour = toner2colour($toner['toner_descr']);
+$colour = toner2colour($toner['toner_descr'], 100 - $toner['toner_current']);
 if ($colour['left'] == null) {
     $colour['left'] = 'CC0000';
 }