video/system/core/Benchmark.php

   1 <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   2 /**
   3  * CodeIgniter
   4  *
   5  * An open source application development framework for PHP 5.1.6 or newer
   6  *
   7  * @package             CodeIgniter
   8  * @author              ExpressionEngine Dev Team
   9  * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
  10  * @license             http://codeigniter.com/user_guide/license.html
  11  * @link                http://codeigniter.com
  12  * @since               Version 1.0
  13  * @filesource
  14  */
  15
  16 // ------------------------------------------------------------------------
  17
  18 /**
  19  * CodeIgniter Benchmark Class
  20  *
  21  * This class enables you to mark points and calculate the time difference
  22  * between them.  Memory consumption can also be displayed.
  23  *
  24  * @package             CodeIgniter
  25  * @subpackage  Libraries
  26  * @category    Libraries
  27  * @author              ExpressionEngine Dev Team
  28  * @link                http://codeigniter.com/user_guide/libraries/benchmark.html
  29  */
  30 class CI_Benchmark {
  31
  32         /**
  33          * List of all benchmark markers and when they were added
  34          *
  35          * @var array
  36          */
  37         var $marker = array();
  38
  39         // --------------------------------------------------------------------
  40
  41         /**
  42          * Set a benchmark marker
  43          *
  44          * Multiple calls to this function can be made so that several
  45          * execution points can be timed
  46          *
  47          * @access      public
  48          * @param       string  $name   name of the marker
  49          * @return      void
  50          */
  51         function mark($name)
  52         {
  53                 $this->marker[$name] = microtime();
  54         }
  55
  56         // --------------------------------------------------------------------
  57
  58         /**
  59          * Calculates the time difference between two marked points.
  60          *
  61          * If the first parameter is empty this function instead returns the
  62          * {elapsed_time} pseudo-variable. This permits the full system
  63          * execution time to be shown in a template. The output class will
  64          * swap the real value for this variable.
  65          *
  66          * @access      public
  67          * @param       string  a particular marked point
  68          * @param       string  a particular marked point
  69          * @param       integer the number of decimal places
  70          * @return      mixed
  71          */
  72         function elapsed_time($point1 = '', $point2 = '', $decimals = 4)
  73         {
  74                 if ($point1 == '')
  75                 {
  76                         return '{elapsed_time}';
  77                 }
  78
  79                 if ( ! isset($this->marker[$point1]))
  80                 {
  81                         return '';
  82                 }
  83
  84                 if ( ! isset($this->marker[$point2]))
  85                 {
  86                         $this->marker[$point2] = microtime();
  87                 }
  88
  89                 list($sm, $ss) = explode(' ', $this->marker[$point1]);
  90                 list($em, $es) = explode(' ', $this->marker[$point2]);
  91
  92                 return number_format(($em + $es) - ($sm + $ss), $decimals);
  93         }
  94
  95         // --------------------------------------------------------------------
  96
  97         /**
  98          * Memory Usage
  99          *
 100          * This function returns the {memory_usage} pseudo-variable.
 101          * This permits it to be put it anywhere in a template
 102          * without the memory being calculated until the end.
 103          * The output class will swap the real value for this variable.
 104          *
 105          * @access      public
 106          * @return      string
 107          */
 108         function memory_usage()
 109         {
 110                 return '{memory_usage}';
 111         }
 112
 113 }
 114
 115 // END CI_Benchmark class
 116
 117 /* End of file Benchmark.php */
 118 /* Location: ./system/core/Benchmark.php */