php實(shí)現(xiàn)的Timer頁面運(yùn)行時(shí)間監(jiān)測類

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    本文實(shí)例講述了php實(shí)現(xiàn)的Timer頁面運(yùn)行時(shí)間監(jiān)測類及其用法,是一款非常實(shí)用的PHP類文件。分享給大家供大家參考。具體分析如下:
    該php Timer頁面運(yùn)行時(shí)間監(jiān)測類,可按不同key監(jiān)測不同的運(yùn)行時(shí)間。
    Timer.class.php類文件如下:
    <?php
    /** Timer class, 計(jì)算頁面運(yùn)行時(shí)間,可按不同key計(jì)算不同的運(yùn)行時(shí)間
    * Date: 2014-02-28
    * Author: fdipzone
    * Ver: 1.0
    *
    * Func:
    * public start 記錄開始時(shí)間
    * public end 記錄結(jié)束時(shí)間
    * public getTime 計(jì)算運(yùn)行時(shí)間
    * pulbic printTime 輸出運(yùn)行時(shí)間
    * private getKey 獲取key
    * private getMicrotime 獲取microtime
    */
    class Timer{ // class start
    private $_start = array();
    private $_end = array();
    private $_default_key = 'Timer';
    private $_prefix = 'Timer_';
    /** 記錄開始時(shí)間
    * @param String $key 標(biāo)記
    */
    public function start($key=''){
    $flag = $this->getKey($key);
    $this->_start[$flag] = $this->getMicrotime();
    }
    /** 記錄結(jié)束時(shí)間
    * @param String $key 標(biāo)記
    */
    public function end($key=''){
    $flag = $this->getKey($key);
    $this->_end[$flag] = $this->getMicrotime();
    }
    /** 計(jì)算運(yùn)行時(shí)間
    * @param String $key 標(biāo)記
    * @return float
    */
    public function getTime($key=''){
    $flag = $this->getKey($key);
    if(isset($this->_end[$flag]) && isset($this->_start[$flag])){
    return (float)($this->_end[$flag] - $this->_start[$flag]);
    }else{
    return 0;
    }
    }
    /** 輸出頁面運(yùn)行時(shí)間
    * @param String $key 標(biāo)記
    * @return String
    */
    public function printTime($key=''){
    printf("%srun time %f msrn", $key==''? $key : $key.' ', $this->getTime($key)*1000);
    }
    /** 獲取key
    * @param String $key 標(biāo)記
    * @return String
    */
    private function getKey($key=''){
    if($key==''){
    return $this->_default_key;
    }else{
    return $this->_prefix.$key;
    }
    }
    /** 獲取microtime
    */
    private function getMicrotime(){
    list($usec, $sec) = explode(' ', microtime());
    return (float)$usec + (float)$sec;
    }
    } // class end
    ?>
    demo示例代碼如下:
    <?php
    require 'Timer.class.php';
    $timer = new Timer();
    $timer->start();
    $timer->start('program1');
    usleep(mt_rand(100000,500000));
    $timer->end('program1');
    $timer->printTime('program1');
    $timer->start('program2');
    usleep(mt_rand(100000,500000));
    $timer->end('program2');
    $timer->printTime('program2');
    $timer->end();
    $timer->printTime();
    ?>
    demo運(yùn)行輸出:
    program1 run time 163.285971 ms
    program2 run time 100.347042 ms
    run time 264.035940 ms
    希望本文所述對大家的PHP程序設(shè)計(jì)有所幫助。