php Timer 页面运行时间监测类

php Timer 页面运行时间监测类，可按不同key监测不同的运行时间

Timer.class.php

<?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
", $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

?>

demo：

<?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运行输出：

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

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