php获取当前时间戳、日期并精确到毫秒（三种方法）

/**
 * 获取时间戳到毫秒
 * @return bool|string
 */
public static function getMillisecond(){
 list($msec, $sec) = explode(' ', microtime());
 $msectime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
 return $msectimes = substr($msectime,0,13);
}

/**
 * 时间戳 - 精确到毫秒
 * @return float
 */
public static function getMillisecond() {
 list($t1, $t2) = explode(' ', microtime());
 return (float)sprintf('%.0f',(floatval($t1)+floatval($t2))*1000);
}

//时间戳
$_t = self::getMillisecond();
dd($_t);

/**
 * 年月日、时分秒 + 3位毫秒数
 * @param string $format
 * @param null $utimestamp
 * @return false|string
 */
public static function ts_time($format = 'u', $utimestamp = null) {
 if (is_null($utimestamp)){
 $utimestamp = microtime(true);
 }
 
 $timestamp = floor($utimestamp);
 $milliseconds = round(($utimestamp - $timestamp) * 1000);
 
 return date(preg_replace('`(?<!\\)u`', $milliseconds, $format), $timestamp);
}

/**
 * @param array $reqData 接口传递的参数
 * @param PayMerchant $payConf object PayMerchant类型的对象
 * @return array
 */
 public static function getAllInfo($reqData, PayMerchant $payConf)
 {
 /**
 * 参数赋值，方法间传递数组
 */
 $order = $reqData['order'];
 $amount = $reqData['amount'];
 $bank = $reqData['bank'];
 $ServerUrl = $reqData['ServerUrl']; // 异步通知地址
 $returnUrl = $reqData['returnUrl']; // 同步通知地址
 //TODO: do something
 $data = array(
 'mchntCode' => $payConf['business_num'],
 'channelCode' => $bank,
 'mchntOrderNo' => $order,
 'orderAmount' => $amount * 100,
 'clientIp' => request()->ip(),
 'subject' => 'goodsName',
 'body' => 'goodsName',
 'notifyUrl' => $ServerUrl,
 'pageUrl' => $returnUrl,
 'orderTime' => date('YmdHis'),
 'description' => $order,
 'orderExpireTime' => date('YmdHis',time()+300),
 'ts' => self::ts_time('YmdHisu'),
 );
 dd($data);
 }