Singleton Template

<?php 

class ClassName {
    
    /**
     *  Instance
     */
    
    public static $instance = null;
    
    
    
    /**
     *  Singleton
     */
    
    public static function get_instance() {
        
        if ( self::$instance == null ) {
            
            self::$instance = new self;
            
        }
        
        return self::$instance;
    }
    
    
}

//Instantiate
ClassName::get_instance();