public function args_string()
	{
		if ( !isset( $this->args ) || !is_array( $this->args ) )
		{
			return null;
		}
		
		$args = $this->args;
		
		foreach( $args as $key => $arg )
		{
			if ( is_array( $arg ) )
			{
				$args[$key] = 'Array';
			} 
			else 
			{
				$args[$key] = var_export( $arg, true );
			}
		}
		
		return implode( ', ', $args );
	}