[英]How can I regroup an array
我有以下查詢
$sql = 'SELECT F.ID, F.name as famName,F.contactEmail,F.address,F.phone,F.sitting,
M.date,M.time,M.meeting,
P.name as partName,P.email,
R.numAttendees,R.deltoken
FROM Registration R, meeting M,
Participants P,Family F
WHERE date = CURDATE() + INTERVAL 1 DAY
AND R.participant = P.ID
AND R.meeting= M.ID
AND M.family = F.ID
ORDER BY M.meeting';
$data = $pdo -> query($sql)->fetchAll(PDO::FETCH_GROUP);
這正是我所需要的。 但是,然后我需要使用通過電子郵件分組的相同信息。 有什么方法可以做到,而無需重新查詢數據庫?
$grouped_by_email = array();
foreach($data as $row) {
if(!isset($grouped_by_email[$row['email']])) {
$grouped_by_email[$row['email']] = array();
}
$grouped_by_email[$row['email']][] = $row;
}
這將創建一個以電子郵件為鍵的數組數組。
如果要執行此操作類似於SQL中“ GROUP BY”的工作方式,請使用以下命令:
$grouped_by_email = array();
foreach ($data as $row) {
if (!isset($grouped_by_email[$row['email']])) {
$grouped_by_email[$row['email']] = $row;
}
else {
$grouped_by_email[$row['email']] = aggregate($grouped_by_email[$row['email']], $row);
}
}
function aggregate($existingValue, $newValue)
{
// Here write the olumn you want to combine and how.
$newValue['numAttendees'] += $existingValue['numAttendees'];
return $newValue;
}
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