关于php Timer 页面运行时间监测类的相关介绍

<?php
/** Timer class, 计算页面运行时间,可按不同key计算不同的运行时间
*   Date:   2014-02-28
*   Author: fdipzone
*   Ver:    1.0
*
*   Func:
*   public  start        记录开始时间
*   public  end          记录结束时间
*   public  getTime      计算运行时间
*   pulbic  printTime    输出运行时间
*   private getKey       获取key
*   private getMicrotime 获取microtime
*/
class Timer{ // class start
    private $_start = array();
    private $_end = array();
    private $_default_key = 'Timer';
    private $_prefix = 'Timer_';
    /** 记录开始时间
    * @param String $key 标记
    */
    public function start($key=''){
        $flag = $this->getKey($key);
        $this->_start[$flag] = $this->getMicrotime();
    }
    /** 记录结束时间
    * @param String $key 标记
    */
    public function end($key=''){
        $flag = $this->getKey($key);
        $this->_end[$flag] = $this->getMicrotime();
    }
    /** 计算运行时间
    * @param  String $key 标记
    * @return float
    */
    public function getTime($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;
        }
    }
    /** 输出页面运行时间
    * @param  String $key 标记
    * @return String
    */
    public function printTime($key=''){
        printf("%srun time %f ms\r\n", $key==''? $key : $key.' ', $this->getTime($key)*1000);
    }
    /** 获取key
    * @param  String $key 标记
    * @return String 
    */
    private function getKey($key=''){
        if($key==''){
            return $this->_default_key;
        }else{
            return $this->_prefix.$key;
        }
    }
    /** 获取microtime
    */
    private function getMicrotime(){
        list($usec, $sec) = explode(' ', microtime());
        return (float)$usec + (float)$sec;
    }
} // class end
?>

<?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();
?>

program1 run time 163.285971 ms
program2 run time 100.347042 ms
run time 264.035940 ms