diff --git a/php-pimf/pimf-framework/.travis.yml b/php-pimf/pimf-framework/.travis.yml
index 66f242c1fa3..22082ecd60b 100644
--- a/php-pimf/pimf-framework/.travis.yml
+++ b/php-pimf/pimf-framework/.travis.yml
@@ -1,10 +1,10 @@
 language: php
 
 php:
-  - 5.3
-  - 5.4
-  - 5.5
   - 5.6
+  - 5.5
+  - 5.4
+  - 5.3
 
 before_script:
   - phpenv rehash
diff --git a/php-pimf/pimf-framework/core/Pimf/Cache/Storages/File.php b/php-pimf/pimf-framework/core/Pimf/Cache/Storages/File.php
index a734d5dd343..a0d1de99d6c 100644
--- a/php-pimf/pimf-framework/core/Pimf/Cache/Storages/File.php
+++ b/php-pimf/pimf-framework/core/Pimf/Cache/Storages/File.php
@@ -64,8 +64,8 @@ protected function retrieve($key)
    */
   public function put($key, $value, $minutes)
   {
-    if ($minutes <= 0) {
-      return;
+    if ((int)$minutes <= 0) {
+      return null;
     }
 
     $value = $this->expiration($minutes) . serialize($value);
@@ -91,7 +91,7 @@ public function forever($key, $value)
    *
    * @param string $key
    *
-   * @return bool|void
+   * @return bool
    */
   public function forget($key)
   {
@@ -103,5 +103,7 @@ public function forget($key)
 
       return true;
     }
+
+    return false;
   }
 }
diff --git a/php-pimf/pimf-framework/core/Pimf/Param.php b/php-pimf/pimf-framework/core/Pimf/Param.php
index 77fe5e3643e..02b71201b51 100644
--- a/php-pimf/pimf-framework/core/Pimf/Param.php
+++ b/php-pimf/pimf-framework/core/Pimf/Param.php
@@ -37,7 +37,7 @@ public function getAll()
 
   /**
    * @param string $index
-   * @param null   $defaultValue
+   * @param mixed  $defaultValue
    * @param bool   $filtered If you trust foreign input introduced to your PHP code - set to FALSE!
    *
    * @return string
diff --git a/php-pimf/pimf-framework/core/Pimf/View.php b/php-pimf/pimf-framework/core/Pimf/View.php
index 8b4fe06d9c8..c24a5766b3d 100644
--- a/php-pimf/pimf-framework/core/Pimf/View.php
+++ b/php-pimf/pimf-framework/core/Pimf/View.php
@@ -125,11 +125,10 @@ public function pump(array $model)
   }
 
   /**
-   * Is utilized for reading data from inaccessible properties.
-   *
    * @param string $name
    *
-   * @return mixed|null
+   * @return mixed
+   * @throws \OutOfBoundsException If undefined property at the template.
    */
   public function __get($name)
   {
@@ -138,11 +137,9 @@ public function __get($name)
     }
 
     $trace = debug_backtrace();
-    trigger_error(
-      'undefined property "' . $name . '" at file ' . $trace[0]['file'] . ' line ' . $trace[0]['line'], E_USER_WARNING
+    throw new \OutOfBoundsException(
+      'undefined property "' . $name . '" at file ' . $trace[0]['file'] . ' line ' . $trace[0]['line']
     );
-
-    return null;
   }
 
   /**