ISSUE-104: PHP 5.4 improvements

Author: raymondschouten

src/BooleanType.php

@@ -54,14 +54,12 @@ public function buildForm(FormBuilderInterface $builder, array $options)
      */
     public function configureOptions(OptionsResolver $resolver)
     {
-        $self = $this;
-
-        $labelTrueNormalizer = function (Options $options, $value) use ($self) {
-            return !is_null($value) ? (string) $value : $self->humanize($options['value_true']);
+        $labelTrueNormalizer = function (Options $options, $value) {
+            return !is_null($value) ? (string) $value : $this->humanize($options['value_true']);
         };
 
-        $labelFalseNormalizer = function (Options $options, $value) use ($self) {
-            return !is_null($value) ? (string) $value : $self->humanize($options['value_false']);
+        $labelFalseNormalizer = function (Options $options, $value) {
+            return !is_null($value) ? (string) $value : $this->humanize($options['value_false']);
         };
 
         $choicesNormalizer = function (Options $options) {