Reuse code.

lib/Predis/Commands/HashDeleteV24x.php

@@ -2,16 +2,15 @@
 
 namespace Predis\Commands;
 
+use Predis\Helpers;
+
 class HashDeleteV24x extends Command {
     public function getId() {
         return 'HDEL';
     }
 
     public function filterArguments(Array $arguments) {
-        if (count($arguments) === 2 && is_array($arguments[1])) {
-            return array_merge(array($arguments[0]), $arguments[1]);
-        }
-        return $arguments;
+        return Helpers::filterVariadicValues($arguments);
     }
 
     public function parseResponse($data) {

lib/Predis/Commands/ListPushTailV24x.php

@@ -2,15 +2,14 @@
 
 namespace Predis\Commands;
 
+use Predis\Helpers;
+
 class ListPushTailV24x extends Command {
     public function getId() {
         return 'RPUSH';
     }
 
     public function filterArguments(Array $arguments) {
-        if (count($arguments) === 2 && is_array($arguments[1])) {
-            return array_merge(array($arguments[0]), $arguments[1]);
-        }
-        return $arguments;
+        return Helpers::filterVariadicValues($arguments);
     }
 }

lib/Predis/Commands/SetAddV24x.php

@@ -2,16 +2,15 @@
 
 namespace Predis\Commands;
 
+use Predis\Helpers;
+
 class SetAddV24x extends Command {
     public function getId() {
         return 'SADD';
     }
 
     public function filterArguments(Array $arguments) {
-        if (count($arguments) === 2 && is_array($arguments[1])) {
-            return array_merge(array($arguments[0]), $arguments[1]);
-        }
-        return $arguments;
+        return Helpers::filterVariadicValues($arguments);
     }
 
     public function parseResponse($data) {

lib/Predis/Commands/SetRemoveV24x.php

@@ -2,16 +2,15 @@
 
 namespace Predis\Commands;
 
+use Predis\Helpers;
+
 class SetRemoveV24x extends Command {
     public function getId() {
         return 'SREM';
     }
 
     public function filterArguments(Array $arguments) {
-        if (count($arguments) === 2 && is_array($arguments[1])) {
-            return array_merge(array($arguments[0]), $arguments[1]);
-        }
-        return $arguments;
+        return Helpers::filterVariadicValues($arguments);
     }
 
     public function parseResponse($data) {

lib/Predis/Helpers.php

@@ -26,4 +26,11 @@ class Helpers {
         }
         return $arguments;
     }
+
+    public static function filterVariadicValues(Array $arguments) {
+        if (count($arguments) === 2 && is_array($arguments[1])) {
+            return array_merge(array($arguments[0]), $arguments[1]);
+        }
+        return $arguments;
+    }
 }