fix(api): fix php warning in realtime host api (#6174)

* fix(api): fix php warning in realtime host api

* fix(api): fix php warning in centreon classes

www/api/class/centreon_realtime_hosts.class.php

@@ -406,8 +406,9 @@ class CentreonRealtimeHosts extends CentreonRealtimeBase
         $query .= " AND h.enabled = 1 ";
 
         if (
-            in_array($this->sortType, explode(',', $this->arguments['fields'])) ||
-            is_null($this->arguments['fields'])
+            !isset($this->arguments['fields']) ||
+            is_null($this->arguments['fields']) ||
+            in_array($this->sortType, explode(',', $this->arguments['fields']))
         ) {
             $q = 'ASC';
             if (isset($this->order) && strtoupper($this->order) === 'DESC') {

www/class/centreonHostgroups.class.php

@@ -373,7 +373,7 @@ class CentreonHostgroups
             $hostList[] = array(
                 'host' => $elem['host_name'],
                 'host_id' => $elem['host_id'],
-                'hg_name' => $elem[$hgName]
+                'hg_name' => $hgName
             );
         }
 

www/class/centreonInstance.class.php

@@ -271,7 +271,7 @@ class CentreonInstance
         while ($elem = $result->fetchrow()) {
             $instanceList[] = array(
                 'host' => $elem['host_name'],
-                'name' => $elem['instance_name']
+                'name' => $instanceName
             );
         }
 

www/class/centreonServicegroups.class.php

@@ -263,7 +263,7 @@ class CentreonServicegroups
                 'service' => $elem['service_description'],
                 'service_id' => $elem['service_id'],
                 'host' => $elem['host_name'],
-                'sg_name' => $elem[$sgName]
+                'sg_name' => $sgName
             );
         }