Update implementation to a better standard

src/Raygun4php/RaygunClient.php

@@ -322,7 +322,7 @@ public function Send($message)
 
       $message = $this->filterParamsFromMessage($message);
       $message = $this->toJsonRemoveUnicodeSequences($message);
-      $message = str_replace("\0", '', $message);
+      $message = $this->removeNullBytes($message);
 
       if(strlen($message) <= 0) {
         return null;
@@ -419,6 +419,10 @@ function toJsonRemoveUnicodeSequences($struct) {
       return preg_replace_callback("/\\\\u([a-f0-9]{4})/", function($matches){ return iconv('UCS-4LE','UTF-8',pack('V', hexdec("U$matches[1]"))); }, json_encode($struct));
     }
 
+    function removeNullBytes($string) {
+      return str_replace("\0", '', $string);
+    }
+
     /**
      * Optionally applies a value transformation to every matching key, as defined by {@link FilterParams}.
      * Replaces the value by default, but also supports custom transformations through