以下を使用してAPIからデータを取得しています。
function get_web_page($url) {
$options = array(
CURLOPT_RETURNTRANSFER => true, // return web page
CURLOPT_HEADER => false, // don't return headers
CURLOPT_FOLLOWLOCATION => true, // follow redirects
CURLOPT_MAXREDIRS => 10, // stop after 10 redirects
CURLOPT_ENCODING => "", // handle compressed
CURLOPT_USERAGENT => "Space-X", // name of client
CURLOPT_AUTOREFERER => true, // set referrer on redirect
CURLOPT_CONNECTTIMEOUT => 120, // time-out on connect
CURLOPT_TIMEOUT => 120, // time-out on response
);
$ch = curl_init($url);
curl_setopt_array($ch, $options);
$content = curl_exec($ch);
curl_close($ch);
return $content;
}
$response = get_web_page("https://api.spacexdata.com/v3/launches/latest?pretty=true");
$resArr = array();
$resArr = json_decode($response);
echo "<pre>"; print_r($resArr); echo "</pre>";
返されたデータを使用して、配列から特定の要素を取得しようとしています。たとえば、フライト番号は次を使用することで十分に簡単です。
$flight_number = $resArr->flight_number;
echo $flight_number;
ただし、シリアル番号を取得するために次のようなことを行うと機能しません。どこが間違っているのですか？
$core_serial = $resArr->rocket->first_stage->cores->0->core_serial;
echo $core_serial;
APIの出力は次のとおりです。
stdClass Object
(
[flight_number] => 78
[mission_name] => CRS-17
[mission_id] => Array
(
[0] => EE86F74
)
[launch_year] => 2019
[launch_date_unix] => 1556952480
[launch_date_utc] => 2019-05-04T06:48:00.000Z
[launch_date_local] => 2019-05-04T02:48:00-04:00
[is_tentative] =>
[tentative_max_precision] => hour
[tbd] =>
[launch_window] => 0
[rocket] => stdClass Object
(
[rocket_id] => falcon9
[rocket_name] => Falcon 9
[rocket_type] => FT
[first_stage] => stdClass Object
(
[cores] => Array
(
[0] => stdClass Object
(
[core_serial] => B1056
[flight] => 0
[block] => 5
[gridfins] => 1
[legs] => 1
[reused] =>
[land_success] => 1
[landing_intent] => 1
[landing_type] => ASDS
[landing_vehicle] => OCISLY
)
)
)
[second_stage] => stdClass Object
(
[block] => 5
[payloads] => Array
(
[0] => stdClass Object
(
[payload_id] => CRS-17
[norad_id] => Array
(
[0] => 44222
)
[cap_serial] => C113
[reused] => 1
[customers] => Array
(
[0] => NASA (CRS)
)
[nationality] => United States
[manufacturer] => SpaceX
[payload_type] => Dragon 1.1
[payload_mass_kg] => 2482
[payload_mass_lbs] => 5472
[orbit] => ISS
[orbit_params] => stdClass Object
(
[reference_system] => geocentric
[regime] => low-earth
[longitude] =>
[semi_major_axis_km] => 6787.07
[eccentricity] => 0.0001369
[periapsis_km] => 408.006
[apoapsis_km] => 409.865
[inclination_deg] => 51.6417
[period_min] => 92.743
[lifespan_years] =>
[epoch] => 2019-05-14T13:40:22.000Z
[mean_motion] => 15.5267006
[raan] => 168.2377
[arg_of_pericenter] => 352.6849
[mean_anomaly] => 127.392
)
[mass_returned_kg] =>
[mass_returned_lbs] =>
[flight_time_sec] =>
[cargo_manifest] => https://www.nasa.gov/sites/default/files/atoms/files/spacex_crs-17_mission_overview.pdf
)
)
)
[fairings] =>
)
[ships] => Array
(
[0] => OCISLY
[1] => Hollywood
[2] => GOQUEST
)
[telemetry] => stdClass Object
(
[flight_club] => https://www.flightclub.io/result/2d?code=CR17
)
[launch_site] => stdClass Object
(
[site_id] => ccafs_slc_40
[site_name] => CCAFS SLC 40
[site_name_long] => Cape Canaveral Air Force Station Space Launch Complex 40
)
[launch_success] => 1
[links] => stdClass Object
(
[mission_patch] => https://images2.imgbox.com/12/47/6uim8L1a_o.png
[mission_patch_small] => https://images2.imgbox.com/fc/58/9UErD3ut_o.png
[reddit_campaign] => https://new.reddit.com/r/spacex/comments/bd2l28/crs17_launch_campaign_thread/
[reddit_launch] => https://www.reddit.com/r/spacex/comments/bjsn0v/rspacex_crs17_official_launch_discussion_updates
[reddit_recovery] => https://www.reddit.com/r/spacex/comments/bjy7p5/rspacex_crs17_recovery_discussion_updates_thread
[reddit_media] => https://www.reddit.com/r/spacex/comments/bkc4d5/rspacex_crs17_media_thread_videos_images_gifs
[presskit] => https://www.spacex.com/sites/spacex/files/crs-17_press_kit.pdf
[article_link] => https://spaceflightnow.com/2019/05/04/spacex-launches-space-station-resupply-mission-lands-rocket-on-drone-ship/
[wikipedia] => https://en.wikipedia.org/wiki/SpaceX_CRS-17
[video_link] => https://youtu.be/AQFhX5TvP0M
[youtube_id] => AQFhX5TvP0M
[flickr_images] => Array
(
[0] => https://live.staticflickr.com/65535/46856594435_206c773b5a_o.jpg
[1] => https://live.staticflickr.com/65535/47720639872_284e49381d_o.jpg
[2] => https://live.staticflickr.com/65535/46856594755_88f1b22e50_o.jpg
[3] => https://live.staticflickr.com/65535/47720639542_1b7c1a71b0_o.jpg
[4] => https://live.staticflickr.com/65535/47720639732_e04b2a9ed7_o.jpg
[5] => https://live.staticflickr.com/65535/32829382467_087d024428_o.jpg
)
)
[details] => SpaceX's 17th Commercial Resupply Services mission for NASA out of a total of 20 contracted flights, this mission brings essential supplies to the International Space Station using SpaceX's reusable Dragon 1 spacecraft. The external payloads for this mission include Orbital Carbon Observatory 3 and Space Test Program-Houston 6. The Falcon 9 launches from SLC-40 at Cape Canaveral AFS. The booster was expected to land at LZ-1, however, due to the ongoing investigation and clean-up following the Crew Dragon testing incident, it is likely to land on OCISLY instead.
[upcoming] =>
[static_fire_date_utc] => 2019-04-27T07:23:00.000Z
[static_fire_date_unix] => 1556349780
[timeline] => stdClass Object
(
[webcast_liftoff] => 900
[go_for_prop_loading] => -2280
[rp1_loading] => -2100
[stage1_lox_loading] => -2100
[stage2_lox_loading] => -960
[engine_chill] => -420
[prelaunch_checks] => -60
[propellant_pressurization] => -60
[go_for_launch] => -45
[ignition] => -3
[liftoff] => 0
[maxq] => 72
[meco] => 137
[stage_sep] => 141
[second_stage_ignition] => 148
[first_stage_boostback_burn] => 154
[first_stage_entry_burn] => 399
[first_stage_landing] => 507
[seco-1] => 519
[dragon_separation] => 578
[dragon_solar_deploy] => 728
[dragon_bay_door_deploy] => 8340
)
)
具体的には、ミックス内にアレイがあります cores
[cores] => Arrayたとえば、ダンプではなく、ダンプでどのように注釈が付けられているかを確認してください[rocket] => stdClass Object
そう
$core_serial = $resArr->rocket->first_stage->cores[0]->core_serial;
この記事はインターネットから収集されたものであり、転載の際にはソースを示してください。
侵害の場合は、連絡してください[email protected]
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