Edw*_*ard 6 php arrays oop foreach object
我刚开始使用PHP中的对象.我有一个带有print_r输出的JSON对象,如下所示(请参见下文).我编辑它来缩短它,但这是它的结构:
stdClass Object
(
[STATION_2CHAR] => ST
[STATIONNAME] => Summit
[ITEMS] => stdClass Object
(
[ITEM] => Array
(
[0] => stdClass Object
(
[ITEM_INDEX] => 0
[SCHED_DEP_DATE] => 07:55:00 08/02/2013
[DESTINATION] => Dover
[TRACK] => 1
[LINE] => M&E
[TRAIN_ID] => 6607
[STATUS] => All Aboard
[SEC_LATE] => 322
[BACKCOLOR] => green
[FORECOLOR] => white
[SHADOWCOLOR] => black
[GPSLATITUDE] =>
[GPSLONGITUDE] =>
[GPSTIME] => 8/2/2013 7:59:37 AM
[TRAIN_LINE] => Morris & Essex Line
[STATION_POSITION] => 1
[LINEABBREVIATION] => M&E
[INLINEMSG] =>
[STOPS] => stdClass Object
(
[STOP] => Array
(
[0] => stdClass Object
(
[NAME] => Chatham
[TIME] => 8/2/2013 8:05:31 AM
)
[1] => stdClass Object
(
[NAME] => Madison
[TIME] => 8/2/2013 8:08:43 AM
)
[2] => stdClass Object
(
[NAME] => Convent Station
[TIME] => 8/2/2013 8:12:56 AM
)
... etc
)
)
)
[1] => stdClass Object
(
[ITEM_INDEX] => 1
[SCHED_DEP_DATE] => 08:07:00 08/02/2013
[DESTINATION] => Hoboken
[TRACK] => 2
[LINE] => M&E
[TRAIN_ID] => 414
[STATUS] => in 8 Min
[SEC_LATE] => 81
[BACKCOLOR] => lightgreen
[FORECOLOR] => black
[SHADOWCOLOR] => lightgreen
[GPSLATITUDE] => 40.6951
[GPSLONGITUDE] => -74.4034
[GPSTIME] => 8/2/2013 7:59:59 AM
[TRAIN_LINE] => Gladstone Branch
[STATION_POSITION] => 1
[LINEABBREVIATION] => M&E
[INLINEMSG] =>
[STOPS] => stdClass Object
(
[STOP] => Array
(
[0] => stdClass Object
(
[NAME] => Maplewood
[TIME] => 8/2/2013 8:14:53 AM
)
[1] => stdClass Object
(
[NAME] => South Orange
... etc
这是我用来访问这些数据的PHP编码方法.我想知道是否有更好的方法,因为它变得有点复杂,不得不"循环"循环通过它来获得我需要的东西.我对PHP中的Objects有了印象,我可以更直接地访问数据.
这是我写的一些PHP代码.它是一个功能,虽然它到目前为止我的单元测试工作,我觉得有一个更好的方法来做这个更优雅的编程.此函数有两个嵌套的foreach循环和三个"if"语句.对于我来说,找到旅行的连接时间似乎很重要.
// $trip is the Object from the above data sample.
function get_connection($trip,$final_desired_dest,$connection_time) {
foreach ($trip as $st_key=>$st_ny_trip) {
$xfer_depart_time = $st_ny_trip->SCHED_DEP_DATE;
if ($st_ny_trip->STOPS->STOP instanceof stdClass)
{
$st_ny_trip->STOPS->STOP = array($st_ny_trip->STOPS->STOP);
}
foreach ($st_ny_trip->STOPS->STOP as $key=>$value) {
if ($value->NAME == $final_desired_dest ) {
$connect_raw = DateTime::createFromFormat("m/d/Y g:i:s a", $connection_time);
$xfer_depart_raw = DateTime::createFromFormat("H:i:s m/d/Y", $xfer_depart_time);
$final_raw = DateTime::createFromFormat("m/d/Y g:i:s a", $value->TIME);
if ($xfer_depart_raw > $connect_raw) {
$xfer = $xfer_depart_raw->format("m/d/Y g:i:s a");
$final = $final_raw->format("m/d/Y g:i:s a");
return array ($xfer,$final);
} // if (second)
} // if (first)
}
} // foreach (first)
return array ("","");
} // function end
我正在寻找一种更好的方法来改进这一点.我可能会非常忽略如何在这里充分利用Objects和OO编程,所以我期待着能够启发.谢谢!
使用对象和数组的开始是使用对象表示某些东西，使用数组表示某些东西的列表（0,1，很多，很多）。过于简单化，但它让事情开始了。当对象可以回答有关自身的问题（这列火车停在 X 吗？）时，对象特别有用，因为您只需编写一次代码即可经常使用它。
由于您拥有 JSON 格式的对象并显示了print_r，我假设您能够将原始数据转换为您想要的任何格式。您显示的格式有一些数据交换所需的额外字段，但在编程中使用它时可能是多余的。我建议删除无用的字段/级别（例如STOPS中的STOP）并将列表转换为数组，将其他项目转换为对象。
我将数据强行转换为我在下面使用的结构。它允许这样的代码：
$oScheduleDeparture = generate_scheduled_departure_1();
$oStation = generate_station();
print_r($oScheduleDeparture->getConnection('Madison', '3/4/2013 3:14:00 AM'));
print_r($oStation->goesToDestination('Hoboken'));
print_r($oStation->getConnections('Madison', '3/4/2013 3:14:00 AM'));
您应该能够编写一个解析器将原始数据转换为类似的数据。希望能帮助到你！
class Station {
public function goesToDestination($destination) {
$aReturn = array();
foreach ($this->ITEMS as $oScheduledDeparture) {
if ($oScheduledDeparture->goesToStation($destination)) {
$aReturn[] = $oScheduledDeparture;
}
}
return $aReturn;
}
public function getConnections($destination, $connection_time) {
$aReturn = array();
foreach ($this->ITEMS as $oScheduledDeparture) {
if ($oScheduledDeparture->goesToStation($destination)) {
$aReturn[] = array(
'SCHED_DEP_DATE' => $oScheduledDeparture->SCHED_DEP_DATE,
'DESTINATION' => $oScheduledDeparture->DESTINATION,
'CONNECTION' => $oScheduledDeparture->getConnection($destination, $connection_time),
);
}
}
return $aReturn;
}
}
function generate_station() {
$aStation = array(
STATION_2CHAR => 'ST',
STATIONNAME => 'Summit',
);
$oStation = new Station();
foreach ($aItem as $key=>$value) {
$oStation->$key = $value;
}
$oStation->ITEMS = array(
generate_scheduled_departure_0(),
generate_scheduled_departure_1(),
);
return $oStation;
}
class ScheduledDeparture {
public function getScheduledDepartureTime() {
return $this->SCHED_DEP_DATE;
}
public function goesToStation($destination) {
if ($this->DESTINATION == $destination) {
return true;
}
// check stops
foreach ($this->STOPS as $STOP) {
if ($STOP->NAME == $destination) {
return true;
}
}
return false;
}
public function getConnection($destination, $connection_time) {
$connect_raw = DateTime::createFromFormat("m/d/Y g:i:s a", $connection_time);
$xfer_depart_raw = DateTime::createFromFormat("H:i:s m/d/Y", $this->getScheduledDepartureTime());
foreach ($this->STOPS as $STOP) {
if ($STOP->NAME == $destination) {
$final_raw = DateTime::createFromFormat("m/d/Y g:i:s a", $STOP->TIME);
if ($xfer_depart_raw > $connect_raw) {
$xfer = $xfer_depart_raw->format("m/d/Y g:i:s a");
$final = $final_raw->format("m/d/Y g:i:s a");
return array ($xfer,$final);
}
}
}
// no connection available
return false;
}
}
function generate_scheduled_departure_0() {
$aItem = array(
'ITEM_INDEX' => '0',
'SCHED_DEP_DATE' => '07:55:00 08/02/2013',
'DESTINATION' => 'Dover',
'TRACK' => '1',
'LINE' => 'M&E',
'TRAIN_ID' => '6607',
'STATUS' => 'All Aboard',
'SEC_LATE' => '322',
'BACKCOLOR' => 'green',
'FORECOLOR' => 'white',
'SHADOWCOLOR' => 'black',
'GPSLATITUDE' => '',
'GPSLONGITUDE' => '',
'GPSTIME' => '8/2/2013 7:59:37 AM',
'TRAIN_LINE' => 'Morris & Essex Line',
'STATION_POSITION' => '1',
'LINEABBREVIATION' => 'M&E',
'INLINEMSG' => '',
);
$oScheduleDeparture = new ScheduledDeparture();
foreach ($aItem as $key=>$value) {
$oScheduleDeparture->$key = $value;
}
$oScheduleDeparture->STOPS = generate_scheduled_departure_0_stops();
return $oScheduleDeparture;
}
function generate_scheduled_departure_0_stops() {
$aStops = array();
//
$aStop = array(
'NAME' => 'Chatham',
'TIME' => '8/2/2013 8:05:31 AM',
);
$aStops[] = (object)$aStop;
$aStop = array(
'NAME' => 'Madison',
'TIME' => '8/2/2013 8:08:43 AM',
);
$aStops[] = (object)$aStop;
$aStop = array(
'NAME' => 'Convent Station',
'TIME' => '8/2/2013 8:12:56 AM',
);
$aStops[] = (object)$aStop;
return $aStops;
}
// item 1
function generate_scheduled_departure_1() {
$aItem = array(
'ITEM_INDEX' => '1',
'SCHED_DEP_DATE' => '08:07:00 08/02/2013',
'DESTINATION' => 'Hoboken',
'TRACK' => '2',
'LINE' => 'M&E',
'TRAIN_ID' => '414',
'STATUS' => 'in 8 Min',
'SEC_LATE' => '81',
'BACKCOLOR' => 'lightgreen',
'FORECOLOR' => 'black',
'SHADOWCOLOR' => 'lightgreen',
'GPSLATITUDE' => '40.6951',
'GPSLONGITUDE' => '-74.4034',
'GPSTIME' => '8/2/2013 7:59:59 AM',
'TRAIN_LINE' => 'Gladstone Branch',
'STATION_POSITION' => '1',
'LINEABBREVIATION' => 'M&E',
'INLINEMSG' => '',
);
$oScheduleDeparture = new ScheduledDeparture();
foreach ($aItem as $key=>$value) {
$oScheduleDeparture->$key = $value;
}
$oScheduleDeparture->STOPS = generate_scheduled_departure_1_stops();
return $oScheduleDeparture;
}
function generate_scheduled_departure_1_stops() {
$aStops = array();
$aStop = array(
'NAME' => 'Maplewood',
'TIME' => '8/2/2013 8:14:53 AM',
);
$aStops[] = (object)$aStop;
$aStop = array(
'NAME' => 'South Orange',
'TIME' => '8/2/2013 8:08:43 AM',
);
$aStops[] = (object)$aStop;
$aStop = array(
'NAME' => 'Convent Station',
'TIME' => '8/2/2013 8:14:25 AM',
);
$aStops[] = (object)$aStop;
return $aStops;
}
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