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

[php]

/** 

 * 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 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   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 */

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