php - How to handle Objects with arrays to access specific data? -
i'm new working objects in php. have json object print_r output looks (please see below). i've edited shorten it, structure of it:
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] => aboard [sec_late] => 322 [backcolor] => green [forecolor] => white [shadowcolor] => black [gpslatitude] => [gpslongitude] => [gpstime] => 8/2/2013 7:59:37 [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 ) [1] => stdclass object ( [name] => madison [time] => 8/2/2013 8:08:43 ) [2] => stdclass object ( [name] => convent station [time] => 8/2/2013 8:12:56 ) ... 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 [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 ) [1] => stdclass object ( [name] => south orange ... etc this type of php coding method have been using access data. i'm wondering if there better way, because becomes kind of complex having "foreach" loop through @ need. had impression objects in php able access data more directly.
here php code wrote. it's function , while has worked unit testing of far, have feeling there better way more elegant in programming. function has 2 nested foreach loops , 3 "if" statements. seems lot me find connection times trip.
// $trip object above data sample. function get_connection($trip,$final_desired_dest,$connection_time) { foreach ($trip $st_key=>$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 $key=>$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 i'm looking better method improve on this. might overlooking how make full use of objects , oo programming here, forward being enlighten. thanks!
a start using objects , arrays use objects somethings , arrays lists (0,1, many, lots) of somethings. oversimplification, gets things started. objects particularly useful when can answer question (does train stop in x?) code once , use often.
since have objects in json , showing print_r, assume able translate raw data whatever format want. format show has fields necessary data interchange, maybe superfluous when using in programming. recommend removing unhelpful fields/levels (the stop in stops, e.g.) , converting lists arrays, other items objects.
i brute-forced data structure i'd use below. allows code this:
$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')); you should able write parser convert raw data similar. hope helps!
class station { public function goestodestination($destination) { $areturn = array(); foreach ($this->items $oscheduleddeparture) { if ($oscheduleddeparture->goestostation($destination)) { $areturn[] = $oscheduleddeparture; } } return $areturn; } public function getconnections($destination, $connection_time) { $areturn = array(); foreach ($this->items $oscheduleddeparture) { if ($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 $key=>$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 $stop) { if ($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 $stop) { if ($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 $key=>$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 $key=>$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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