CodeIgniter源代码阅读（三）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 {//记录不同点之间的时间消耗
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]);//list 把数组中的值赋给一些变量
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 内存的消耗 把{memory_usage}放于模版的任何一个地方都能显示处理处理过程中的内存消耗是多少
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 */
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 {//记录不同点之间的时间消耗
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]);//list 把数组中的值赋给一些变量
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 内存的消耗 把{memory_usage}放于模版的任何一个地方都能显示处理处理过程中的内存消耗是多少
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 */
