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Internal/package-zerocore/Ability/Singleton.php

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+<?php namespace ZN\Ability;
+/**
+ * ZN PHP Web Framework
+ * 
+ * "Simplicity is the ultimate sophistication." ~ Da Vinci
+ * 
+ * @package ZN
+ * @license MIT [http://opensource.org/licenses/MIT]
+ * @author  Ozan UYKUN [ozan@znframework.com]
+ */
+
+trait Singleton
+{
+    /**
+     * singleton
+     * 
+     * @var self
+     * 
+     * @return self
+     */
+    protected static $singleton = NULL;
+    
+    /**
+     * singleton
+     * 
+     * @param void
+     * 
+     * @return self
+     */
+    protected static function singleton()
+    {
+        if( ! self::$singleton instanceof self ) 
+        {
+            self::$singleton = new self;
+        }
+
+        return self::$singleton;
+    }
+}