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

    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?>

demo：

    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 msprogram2 run time 100.347042 msrun time 264.035940 ms

源码下载地址：