[ticket/12777] Add is_purged()

PHPBB3-12777

phpBB/phpbb/extension/manager.php

@@ -556,6 +556,19 @@ class manager
 		return isset($this->extensions[$name]);
 	}
 
+	/**
+	* Check to see if a given extension is purged
+	*
+	* An extension is purged if it is available, not enabled and not disabled.
+	*
+	* @param string $name Extension name to check
+	* @return bool Depending on whether or not the extension is purged
+	*/
+	public function is_purged($name)
+	{
+		return $this->is_available($name) && !$this->is_configured($name);
+	}
+
 	/**
 	* Instantiates a \phpbb\finder.
 	*