using const

Author: aliabbasrizvi

src/Optimizely/Entity/Experiment.php

@@ -21,6 +21,16 @@
 
 class Experiment
 {
+    /**
+     * @const string String denoting running state of experiment.
+     */
+    const STATUS_RUNNING = 'Running';
+
+    /**
+     * @const string String denoting policy of mutually exclusive group.
+     */
+    const MUTEX_GROUP_POLICY = 'random';
+
     /**
      * @var string Experiment ID.
      */
@@ -262,7 +272,7 @@ public function setTrafficAllocation($trafficAllocation)
      */
     public function isInMutexGroup()
     {
-        return !is_null($this->_groupPolicy) && $this->_groupPolicy == 'random';
+        return !is_null($this->_groupPolicy) && $this->_groupPolicy == self::MUTEX_GROUP_POLICY;
     }
 
     /**
@@ -272,7 +282,7 @@ public function isInMutexGroup()
      */
     public function isExperimentRunning()
     {
-        return !is_null($this->_status) && $this->_status == 'Running';
+        return !is_null($this->_status) && $this->_status == self::STATUS_RUNNING;
     }
 
     /**