Change TRUE, FALSE, NULL capitalization to lowercase

lib/Form/Util/Styles.php

@@ -148,7 +148,7 @@ EOL;
         }, explode(';', trim($rules[$index]))));
 
         // check if we have multiple selectors
-        if(strpos($selector, ',') !== FALSE) {
+        if(strpos($selector, ',') !== false) {
           $selectors_array = array_filter(array_map(function($value) {
             return trim($value);
           }, explode(',', $selector)));
@@ -175,4 +175,4 @@ EOL;
     $this->stripComments();
     return $this->render();
   }
-}
+}

lib/Models/Subscriber.php

@@ -162,7 +162,7 @@ class Subscriber extends Model {
       $subscriber = self::findOne($subscriber->id);
 
       // restore deleted subscriber
-      if($subscriber->deleted_at !== NULL) {
+      if($subscriber->deleted_at !== null) {
         $subscriber->setExpr('deleted_at', 'NULL');
       }
 
@@ -708,4 +708,4 @@ class Subscriber extends Model {
       )
     );
   }
-}
+}