私は PHP が初めてで、多次元配列を使用してイベントを処理しています。何らかの理由で Foreach 関数を使用すると、最後のサブ配列に対してエラーがスローされます。何が間違っているのかわかりません。
多次元配列は以下です。キーは、event_id、day、track、session の順です。
Array
(
[718] => Array
(
[1] => Array
(
[1] => Array
(
[1745] => Array
(
[session_id] => 1745
[event_start_date] => 2010-12-02 09:00
[session_position] => 1
)
[1554] => Array
(
[session_id] => 1554
[event_start_date] => 2010-12-02 09:00
[session_position] => 2
)
[1557] => Array
(
[session_id] => 1557
[event_start_date] => 2010-12-02 09:00
[session_position] => 3
)
[1678] => Array
(
[session_id] => 1678
[event_start_date] => 2010-12-02 09:00
[session_position] => 4
)
)
[2] => Array
(
[1555] => Array
(
[session_id] => 1555
[event_start_date] => 2010-12-02 09:00
[session_position] => 1
)
)
[3] => Array
(
[1649] => Array
(
[session_id] => 1649
[event_start_date] => 2010-12-02 09:00
[session_position] => 1
)
[1672] => Array
(
[session_id] => 1672
[event_start_date] => 2010-12-02 09:00
[session_position] => 2
)
[1651] => Array
(
[session_id] => 1651
[event_start_date] => 2010-12-02 09:00
[session_position] => 3
)
)
)
[2] => Array
(
[2] => Array
(
[1559] => Array
(
[session_id] => 1559
[event_start_date] => 2010-12-02 09:00
[session_position] => 1
)
[1669] => Array
(
[session_id] => 1669
[event_start_date] => 2010-12-02 09:00
[session_position] => 2
)
[1650] => Array
(
[session_id] => 1650
[event_start_date] => 2010-12-02 09:00
[session_position] => 3
)
)
[4] => Array
(
[1652] => Array
(
[session_id] => 1652
[event_start_date] => 2010-12-02 09:00
[session_position] => 1
)
[1561] => Array
(
[session_id] => 1561
[event_start_date] => 2010-12-02 09:00
[session_position] => 2
)
[1654] => Array
(
[session_id] => 1654
[event_start_date] => 2010-12-02 09:00
[session_position] => 3
)
)
[5] => Array
(
[1638] => Array
(
[session_id] => 1638
[event_start_date] => 2010-12-02 09:00
[session_position] => 1
)
[1556] => Array
(
[session_id] => 1556
[event_start_date] => 2010-12-02 09:00
[session_position] => 2
)
[1653] => Array
(
[session_id] => 1653
[event_start_date] => 2010-12-02 09:00
[session_position] => 3
)
)
)
)
)
次のコードを使用して配列を表示しています（バグが修正されたら処理します）
reset($rec_info); // the above array
foreach ($rec_info as $rec_event => $event_details) {
echo "event is: " . $rec_event . "<br />";
foreach ($event_details as $rec_day => $day_details){
echo "day is: " . $rec_day . "<br />";
foreach ($day_details as $rec_track => $track_details){
echo "track is: " . $rec_track . "<br />";
foreach ($track_details as $rec_session => $session_details) {
echo "session_id is: " . $session_details["session_id"]. "<br />";
}
}
}
}
これは表示されます
event is: 718
day is: 1
track is: 1
session_id is: 1745
session_id is: 1554
session_id is: 1557
session_id is: 1678
track is: 2
session_id is: 1555
track is: 3
session_id is: 1649
session_id is: 1672
session_id is: 1651
day is: 2
Warning: Invalid argument supplied for foreach() in /opt/lampp/htdocs/dev/global.php on line 349
他のイベント (2 ～ 5 日) を処理する場合、この警告がスローされるのは常に最終日です。
コードが他のすべての日では機能するのに、最後の日では機能しない理由がわかりません。配列が境界を超えたかのようです。その日を除いて、print_rを使用してすべてのサブアレイを正しく表示できます。
echo "<hr> tracks : <pre>"; print_r($track_details); echo "</pre> <br />";