<?php

if ( ! function_exists('file_suffix'))
{
	function file_suffix($file, $format='Ymdhis')
	{
		$CI = get_instance();

		$file_path = FCPATH . ltrim($file, '/');
		if (file_exists($file_path)) {
			return $CI->config->base_url($file) . '?' . date($format, filemtime($file_path));
		}
		else
		{
			return $CI->config->base_url($file);
		}
	}
}