如何检查一个Unix Timestamp范围是否与PHP中的另一个Unix时间戳范围重叠?
我正在开发一个将来保留的应用程序。但是,每个时期仅允许一(1)个预订。
示例:
MR。X可以预订资源,从上午10:00。后来,Y女士想从上午8:00保留相同的资源。我的申请应拒绝 Y女士的尝试预订,因为它重叠 我将现有预订的开始和结束时间存储在Unix时间戳(整数)中,但是我可以将它们转换为以下格式" yyyy-mm-dd hh:mm:mm:ss",如果需要,如果需要,反之亦然。<<<<<<<<<<<<<<<<<。/p> 我不明白如何解决这个问题。如果我以所有现有的预订开始时间检查新的开始时间,并且以类似方式检查新的结束时间,则逻辑将具有许多 您是否请帮助我以有效的方式解决此问题,而无需使用大量服务器资源。 非常感谢您的帮助。 谢谢if
语句,并使应用程序缓慢。
简介
换句话说,您需要对特定资源进行比较(UNIX时间戳),以确定新的预订是否有效(在域内于新的预订)。
步骤1
首先,类似于此的SQL查询可能会有所帮助。诸如ANY
,ALL
,NOT
,EXISTS
等关键词似乎很诱人,但在计划冲突(基于UI)时,您必须决定您需要多少信息。此查询提供了提供有关潜在保留的最大信息(在PHP等中的最大信息)的机会。向前看。
// A query like this might help. It's not perfect, but you get the idea.
// This query looks for ALL potential conflicts, starting and ending.
$sql = "SELECT DISTINCT `t1`.`startTime`, `t1`.`endTime`
FROM `reservations` AS `t1`
INNER JOIN `resources` AS `t2`
ON `t1`.`resourceId` = `t2`.`resourceId`
WHERE `t2`.`resourceId` = :resourceId
AND (`t1`.`startTime` BETWEEN :minTime1 AND :maxTime1)
OR (`t1`.`endTime` BETWEEN :minTime2 AND :maxTime2)
ORDER BY `t1`.`startTime` ASC";
可能。这将为您提供多维数组。以下逻辑允许您获得报告详细信息为什么不能进行预订。您可以在另一个模块中解释报告。
步骤2
概括
作为Reservation
类的方法解决方案。根据您的RDBMS,您可以在SQL中进行类似的操作。虽然,它可能是的特定特定性要少得多,您可能希望粒度稍后。您可以以JSON格式将报告发送到JavaScript前端(只是要考虑的事情)。
private function inOpenDomain(array $exclusion, $testStart, $testEnd)
{
$result = null;
$code = null;
$start = $exclusion[0];
$end = $exclusion[1];
if (($testStart > $end) || ($testEnd < $start)) {
$result = true;
$code = 0; //Good! No conflict.
} elseif ($testStart === $start) {
$result = false;
$code = 1;
} elseif ($testStart === $end) {
$result = false;
$code = 2;
} elseif ($testEnd === $start) {
$result = false;
$code = 3;
} elseif ($testEnd === $end) {
$result = false;
$code = 4;
} elseif (($testStart > $start) && ($testEnd < $end)) { //Middle
$result = false;
$code = 5;
} elseif (($testStart < $start) && ($testEnd > $start)) { //Left limit
$result = false;
$code = 6;
} elseif (($testStart < $end) && ($testEnd > $end)) { //Right limit
$result = false;
$code = 7;
} elseif (($testStart < $start) && ($testEnd > $end)) { //Both limits
$result = false;
$code = 8;
} else {
$result = false;
$code = 9;
}
return ['start' => $start, 'end' => $end, 'result' => $result => 'code' => $code];
}
步骤3
制作一种管理先前预订时间检查的方法(假设PDO::FETCH_ASSOC
)。
private function checkPeriods(array $periods, $newStartTime, $newEndTime)
{
$report = [];
if (!isset($periods[0])) { //If NOT multi-dimensional
$report = inOpenDomain($periods, $newStartTime, $newEndTime)
} else {
for ($i = 0, $length = $count($periods); $i < $length; ++$i) {
$report[$i] = inOpenDomain($periods[$i], $newStartTime, $newEndTime);
}
}
return $report;
}
步骤4
时尚一种使用PDO准备的语句在reservations
表上执行SELECT
的方法。通常,...
private function getReservationTimes($resourceId, $minTime, $maxTime)
{
$sql = "SELECT DISTINCT `t1`.`startTime`, `t1`.`endTime`
FROM `reservations` AS `t1`
INNER JOIN `resources` AS `t2`
ON `t1`.`resourceId` = `t2`.`resourceId`
WHERE `t2`.`resourceId` = :resourceId
AND (`t1`.`startTime` BETWEEN :minTime1 AND :maxTime1)
OR (`t1`.`endTime` BETWEEN :minTime2 AND :maxTime2)
ORDER BY `t1`.`startTime` ASC";
$stmt = $this->db->prepare($sql);
$stmt->bindParam(:resourceId , $resourceId);
$stmt->bindParam(:minTime1 , $minTime);
$stmt->bindParam(:maxTime1 , $maxTime);
$stmt->bindParam(:minTime2 , $minTime);
$stmt->bindParam(:maxTime2 , $maxTime);
$stmt->execute();
return $stmt->fetchAll();
}
步骤5
在整个过程中制作公共方法(接口)。
public function isOpen($minTime, $maxTime)
{
$periods = $this->getReservationTimes($this->resource->getResourceId(), $minTime, $maxTime);
if (empty($periods)) {
return true; //You may reserve the resource during the time period.
}
return $this->checkPeriods($periods, $this->start, $this->end));
}
步骤6
将关注点分开。
为要保留的实际项目创建类层次结构。
abstact class Product
{
}
class Resource extends Product implements Reservable //Or, something ...
{
private $resourceId;
//etc ....
}
为预订创建类层次结构。
abstract class Interval
{
private $start;
private $end;
public function __construct($start, $end)
{
$this->start = $start;
$this->end = $end;
}
}
class Reservation extends Interval
{
private $db;
private $resource;
public function __construct(PDO $pdo, Reservable $resource, $reqStartTime, $reqEndTime)
{
parent::__construct($reqStartTime, $reqEndTime);
$this->db = $pdo;
$this->resource = $resource;
}
}
步骤7
在try/catch
中运行当您实例化Reservation
对象时,至少提供Reservable
对象,请求的开始时间和请求的结束时间(在这种情况下为Unix Timestamps)。
try
{
$day = 84600; // Seconds per day.
$future = $day * 90; // Application specific.
//User requested times.
$reqStartTime = 1488394687 + $day; // Tomorrow.
$reqEndTime = 1488394687 + ($day * 2); // Two day duration.
//Search constraints.
$minTime = time(); // Today. Right now.
$maxTime = 1488394687 + $future; // 90 day look ahead.
$reservation = new Reservation($pdo, $resourceObj, $reqStartTime, $reqEndTime);
$availability = $reservation->isOpen($minTime, $maxTime);
if($availability === true){
$reservation->confirm();
} else {
//Have some other object deal with the report
$reporter = new Reporter($availability);
$reporter->analyzeReport();
//Have some other object update the view, etc ...
}
}
catch(Exception $e)
{
//Handle it.
}