source: sourcecode/system/core/Benchmark.php @ 1

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license             http://codeigniter.com/user_guide/license.html
 * @link                http://codeigniter.com
 * @since               Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter Benchmark Class
 *
 * This class enables you to mark points and calculate the time difference
 * between them.  Memory consumption can also be displayed.
 *
 * @package             CodeIgniter
 * @subpackage  Libraries
 * @category    Libraries
 * @author              ExpressionEngine Dev Team
 * @link                http://codeigniter.com/user_guide/libraries/benchmark.html
 */
class CI_Benchmark {

        /**
         * List of all benchmark markers and when they were added
         *
         * @var array
         */
        var $marker = array();

        // --------------------------------------------------------------------

        /**
         * Set a benchmark marker
         *
         * Multiple calls to this function can be made so that several
         * execution points can be timed
         *
         * @access      public
         * @param       string  $name   name of the marker
         * @return      void
         */
        function mark($name)
        {
                $this->marker[$name] = microtime();
        }

        // --------------------------------------------------------------------

        /**
         * Calculates the time difference between two marked points.
         *
         * If the first parameter is empty this function instead returns the
         * {elapsed_time} pseudo-variable. This permits the full system
         * execution time to be shown in a template. The output class will
         * swap the real value for this variable.
         *
         * @access      public
         * @param       string  a particular marked point
         * @param       string  a particular marked point
         * @param       integer the number of decimal places
         * @return      mixed
         */
        function elapsed_time($point1 = '', $point2 = '', $decimals = 4)
        {
                if ($point1 == '')
                {
                        return '{elapsed_time}';
                }

                if ( ! isset($this->marker[$point1]))
                {
                        return '';
                }

                if ( ! isset($this->marker[$point2]))
                {
                        $this->marker[$point2] = microtime();
                }

                list($sm, $ss) = explode(' ', $this->marker[$point1]);
                list($em, $es) = explode(' ', $this->marker[$point2]);

                return number_format(($em + $es) - ($sm + $ss), $decimals);
        }

        // --------------------------------------------------------------------

        /**
         * Memory Usage
         *
         * This function returns the {memory_usage} pseudo-variable.
         * This permits it to be put it anywhere in a template
         * without the memory being calculated until the end.
         * The output class will swap the real value for this variable.
         *
         * @access      public
         * @return      string
         */
        function memory_usage()
        {
                return '{memory_usage}';
        }

}

// END CI_Benchmark class

/* End of file Benchmark.php */
/* Location: ./system/core/Benchmark.php */