CI framework source code reading---------Benchmark test class Benchmark.php

CI framework source code reading---------Benchmark test class Benchmark.php_PHP tutorial

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Release： 2016-07-14 10:09:04

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[php]

/**

* CodeIgniter

* An open source application development framework for PHP 5.1.6 or newer

* @package CodeIgniter

* @author ExpressionEngine Dev Team

* @license http://codeigniter.com/user_guide/license.html

* @link http://codeigniter.com

* @since Version 1.0

* @filesource

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

/**

* CodeIgniter Benchmark Class

* This class enables 能够 you to mark points and calculate 计算 the time difference 差异

* 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

* Array used to store benchmark class tags

* @var array

var $marker = array();

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

/**

* Set a benchmark marker

* 设置一个标记点

* 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)

{

// When a method is called anywhere in the program, the current time point will be recorded.

$this->marker[$name] = microtime();

}

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

/**

* Calculates the time difference between two marked points.

* 计算出两个时间点之间的时间。

* If the first parameter is empty this function instead returns the

* {elapsed_time} pseudo-variable 虚假变量. This permits 许可 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 integer the number of decimal places

* @return mixed

function elapsed_time($point1 = '', $point2 = '', $decimals = 4)

{

* If no clear time point is given, the running time of the entire program will be calculated.

* How can we calculate the running time of the entire program? In fact, it is the Output component that performs this calculation.

* When calling Benchmark::elapsed_time(); (no parameters), what is actually returned first is not

* It is impossible to measure the running time of the entire program. What is actually returned is an {elapsed_time} tag, and then

* When Output is processing the output, it calculates the entire program running time, because the program can be viewed during the output processing stage

* Since it is in the final stage, the total time can be approximately calculated, and then the {elapsed_time} in the output can be replaced.

* The principle of memory_usage() below is the same.

if ($point1 == '')

{

Return '{elapset_time}';

} }

if ( ! isset($this->marker[$point1]))

{

return '';

} }

if ( ! isset($this->marker[$point2]))

{

$this->marker[$point2] = microtime();

} }

//Why list is used here is because microtime(); returns the value in the format of "msec sec".

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.

* www.2cto.com

* @access public

* @return string

function memory_usage()

{

return '{memory_usage}';

}

// END CI_Benchmark class

/* End of file Benchmark.php */

/* Location: ./system/core/Benchmark.php */