<?php

class Run_Time_Test{

    /* 时间控制参数 */
    const MICROSECONDS = 100000;

    /* 换行符 */
    //web换行
    const WEB_NEW_LINE = "<br/>";
    //linux换行
    const LINUX_NEW_LINE = "\n";

    /* 首次运行时间 */
    public static $first;

    /* 上次运行时间 */
    public static $prev;

    /* 运行输出字符串 */
    public static $str;

    /* 运行环境 */
    public static $environment;

    public static $outputBoolean;

    /**
     *
     * 时间测试开始
     * @param boolean $environment(false为页面，true为linux环境)
     */
    public static function begin($output=false, $environment=false){
        self::$prev = self::$first = self::getCurrentTime()+0;
        self::$environment = $environment ? self::LINUX_NEW_LINE : self::WEB_NEW_LINE;
        self::$outputBoolean = $output;
    }

    /**
     *
     * 显示上次运行时间
     */
    public static function preTime(){
        /* 获取当前时间 */
        $currentTime = self::getCurrentTime();
        self::setTimeStr($currentTime);
        self::$prev = $currentTime;
    }

    /**
     *
     * 显示总运行时间
     */
    public static function end(){
        $currentTime = self::getCurrentTime();
        self::setTimeStr($currentTime);
    }

    /**
     *
     * 设置时间执行字符串
     */
    protected static function setTimeStr($currentTime){
        $preConsumeTime = intval(($currentTime - self::$prev) * self::MICROSECONDS)/self::MICROSECONDS;
        $allConsumeTime = intval(($currentTime - self::$first) * self::MICROSECONDS)/self::MICROSECONDS;
        self::$str = 'previous time:'. $preConsumeTime . ' | ' . 'all time:'. $allConsumeTime . self::$environment;
        if(self::$outputBoolean){
            echo self::$str;
        }
    }

    /**
     *
     * 获取当前时间
     */
    private static function getCurrentTime(){
        $time = explode(' ', microtime());
        return $time[1] . substr($time[0], 1, 7); // 1212466268.034119形式
    }
}