Add php_runtime_generation to Environment model

Author: rkunjappan

src/Models/Environment.php

@@ -683,6 +683,16 @@ public function getPHPVersion()
             : null;
     }
 
+    /**
+     * Gets the PHP runtime generation of this environment
+     *
+     * @return string
+     */
+    public function getPHPRuntimeGeneration()
+    {
+        return $this->settings('php_runtime_generation');
+    }
+
     /**
      * @return UpstreamStatus
      */
@@ -947,6 +957,7 @@ public function serialize()
             'initialized' => $this->isInitialized(),
             'connection_mode' => $this->get('connection_mode'),
             'php_version' => $this->getPHPVersion(),
+            'php_runtime_generation' => $this->getPHPRuntimeGeneration(),
         ];
     }