Unambiguously typecast to expected datatype

ajax/networking/get_frequencies.php

@@ -9,6 +9,7 @@ if (isset($_POST['interface'])) {
     define( 'NL80211_BAND_24GHZ', 0x1 );
     define( 'NL80211_BAND_5GHZ', 0x2 );
     $iface = escapeshellcmd($_POST['interface']);
+    $flags = 0;
 
     // get physical device for selected interface
     exec("iw dev | awk '/$iface/ {print line}{line = $0}'", $return);

app/lib/system.php

@@ -49,7 +49,7 @@ class Sysinfo
     public function usedMemory()
     {
         $used = shell_exec("free -m | awk 'NR==2{ total=$2 ; used=$3 } END { print used/total*100}'");
-        return floor($used);
+        return floor(intval($used));
     }
 
     public function processorCount()