Avoid calls to backend_command() if the function has not yet been def…

…ined. Also make sure that certain variables are defined as 'global' in case I later decide to actually load the backend connection routines early. Closes #3305 again.

git-svn-id: http://svn.mythtv.org/svn/trunk@13335 7dbf422c-18fa-0310-86e9-fd20926502f2

includes/mythbackend.php

@@ -22,9 +22,11 @@
 // NUMPROGRAMLINES is defined in mythtv/libs/libmythtv/programinfo.h and is
 // the number of items in a ProgramInfo QStringList group used by
 // ProgramInfo::ToSringList and ProgramInfo::FromStringList.
+    global $NUMPROGRAMLINES;
     $NUMPROGRAMLINES = 43;
 
 // Keep track of the master backend port/ip
+    global $Master_Host, $Master_Port;
     $Master_Host = get_backend_setting('MasterServerIP');
     $Master_Port = get_backend_setting('MasterServerPort');
     if (!$Master_Host || !$Master_Port)

includes/utils.php

@@ -56,8 +56,13 @@ function setting($field, $hostname=null, $new_value = "old\0old") {
             $db->query('INSERT INTO settings (value, data, hostname) VALUES (?,?,?)',
                        $field, $new_value, $hostname);
             $cache[$h][$field] = $new_value;
-        // Alert the rest of the MythTV network
-            backend_command('CLEAR_SETTINGS_CACHE');
+        // Alert the rest of the MythTV network.  Though there are some
+        // occasional times where setting() gets called before we're actually
+        // connected to the backend, the only known instance is in db_update.php
+        // and those settings don't affect anything but MythWeb.
+            if (function_exists('backend_command')) {
+                backend_command('CLEAR_SETTINGS_CACHE');
+            }
         }
     // Not cached?
         elseif (!array_key_exists($field, $cache[$h])) {