学步园

<?php<br /> /*<br /> * This class enables you to mark points and calculate the time difference<br /> * between them. Memory consumption can also be displayed.<br /> *<br /> * @package CodeIgniter<br /> * @subpackage Libraries<br /> * @category Libraries<br /> * @author ExpressionEngine Dev Team<br /> * @link http://codeigniter.com/user_guide/libraries/benchmark.html<br /> */<br /> class CI_Benchmark {</p> <p> var $marker = array();</p> <p> // --------------------------------------------------------------------</p> <p> /**<br /> * Set a benchmark marker<br /> *<br /> * Multiple calls to this function can be made so that several<br /> * execution points can be timed<br /> *<br /> * @access public<br /> * @param string $name name of the marker<br /> * @return void<br /> */<br /> function mark($name)<br /> {<br /> $this->marker[$name] = microtime();<br /> }</p> <p> // --------------------------------------------------------------------</p> <p> /**<br /> * Calculates the time difference between two marked points.<br /> *<br /> * If the first parameter is empty this function instead returns the<br /> * {elapsed_time} pseudo-variable. This permits the full system<br /> * execution time to be shown in a template. The output class will<br /> * swap the real value for this variable.<br /> *<br /> * @access public<br /> * @param string a particular marked point<br /> * @param string a particular marked point<br /> * @param integer the number of decimal places<br /> * @return mixed<br /> */<br /> function elapsed_time($point1 = '', $point2 = '', $decimals = 4)<br /> {<br /> if ($point1 == '')<br /> {<br /> return '{elapsed_time}';<br /> }</p> <p> if ( ! isset($this->marker[$point1]))<br /> {<br /> return '';<br /> }</p> <p> if ( ! isset($this->marker[$point2]))<br /> {<br /> $this->marker[$point2] = microtime();<br /> }</p> <p> list($sm, $ss) = explode(' ', $this->marker[$point1]);<br /> list($em, $es) = explode(' ', $this->marker[$point2]);</p> <p> return number_format(($em + $es) - ($sm + $ss), $decimals);<br /> }</p> <p> // --------------------------------------------------------------------</p> <p> /**<br /> * Memory Usage<br /> *<br /> * This function returns the {memory_usage} pseudo-variable.<br /> * This permits it to be put it anywhere in a template<br /> * without the memory being calculated until the end.<br /> * The output class will swap the real value for this variable.<br /> *<br /> * @access public<br /> * @return string<br /> */<br /> function memory_usage()<br /> {<br /> return '{memory_usage}';<br /> }</p> <p>}</p> <p>// END CI_Benchmark class</p> <p>/* End of file Benchmark.php */<br /> /* Location: ./system/libraries/Benchmark.php */<br />

一个小例子，如下：

<?php</p> <p>header("Content-Type:text/html;charset=UTF-8");<br /> if( ! defined('BASEPATH') ) {<br /> define ('BASEPATH', $_SERVER['DOCUMENT_ROOT'].'/news/');<br /> }<br /> require_once BASEPATH.'service/Json_service.php';<br /> require_once BASEPATH.'common/Benchmark.php';</p> <p>$benchmark = new CI_Benchmark();<br /> $benchmark->mark('10');<br /> $benchmark->mark('11');</p> <p>$benchmark->mark('12');<br /> $jsonservice = new JsonService();<br /> $benchmark->mark('13');<br /> $resultjson = $jsonservice->getNewsTitleJsonArray($categoryid=143746653,$index=1,$max=20,$lastpage,$lastid);<br /> $benchmark->mark('14');<br /> $jsonservice->clear();<br /> //$size = strlen($resultjson);<br /> //header("Content-Length: $size");<br /> $benchmark->mark('15');<br /> echo '-----------------------------------------'.'<br>';<br /> echo $benchmark->elapsed_time('10','11',6).'<br>';<br /> echo $benchmark->elapsed_time('11','12',6).'<br>';<br /> echo $benchmark->elapsed_time('12','13',6).'<br>';<br /> echo $benchmark->elapsed_time('13','14',6).'<br>';<br /> echo $benchmark->elapsed_time('14','15',6).'<br>';<br /> ?>