src/AppBundle/Common/TimeMachine.php

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<?php

namespace AppBundle\Common;

use DateTime;
use DateTimeZone;

class TimeMachine
{
    private static $mockedTime = 0;

    private $timezone;

    const HALF_HOUR = 1800;

    const ONE_HOUR = 3600;

    const ONE_DAY = 86400;

    const ONE_MONTH = 259200;

    /**
     * 转化为 时间字符串, 如 2018-12-22 13:33:54
     *
     * @dataExpression strtotime 指定的第一个参数， 如 '+1 Day'
     * @format 时间格式
     */
    public static function expressionToStr($dateExpression, $format = 'Y-m-d H:i:s')
    {
        $timeMachine = new self('Asia/Shanghai');

        return $timeMachine->format($format, strtotime($dateExpression));
    }

    public static function isTimestamp($timestamp)
    {
        return ((string) (int) $timestamp === (string) $timestamp)
        && ($timestamp <= PHP_INT_MAX)
        && ($timestamp >= ~PHP_INT_MAX);
    }

    public function __construct($timezone)
    {
        $this->timezone = $timezone;
    }

    /**
     * 单元测试时，解决因为时间引起的测试报错问题
     */
    public static function time()
    {
        return empty(self::$mockedTime) ? time() : self::$mockedTime;
    }

    public static function setMockedTime($time)
    {
        self::$mockedTime = $time;
    }

    public function format($format, $timestamp = null)