如何增量添加到 multidim 数组 PHP？

Question

我从数据库中提取许多这样的行$rows = [    ['id' => 3, 'course_name' => 'GSG2', 'course_day' => 'Monday', 'course_starts_at' => '01:30:00'],    ['id' => 2, 'course_name' => 'Look1', 'course_day' => 'Wednesday', 'course_starts_at' => '03:10:00']]我需要从中创建一个多维数组，该数组将工作日作为键，将行数组作为值。因为即使当天没有空，我也需要钥匙在场，所以我首先这样做了$timetable = [  ['Monday' => ''],  ['Tuesday' => ''],  ['Wednesday' => ''],  ['Thursday' => ''],  ['Friday' => ''],];然后我就这样做foreach ($rows as $row) {  switch ($row['course_day']) {    case "Monday":      $timetable['Monday'] = $row;      break;    case "Tuesday":      $timetable['Tuesday'] = $row;      break;    case "Wednesday":      $timetable['Wednesday'] = $row;      break;    case "Thursday":      $timetable['Thursday'] = $row;      break;    case "Friday":      $timetable['Friday'] = $row;      break;  }}但随后生成的 multidim 数组每天只有一个课程（其最后一次迭代）。我尝试使用 += 而不是 = 但那不起作用。请问您有什么建议吗？

Answer 1

对您的最简单的修改可能如下：

$timetable = [

    'Monday' => [],

    'Tuesday' => [],

    'Wednesday' => [],

    'Thursday' => [],

    'Friday' => []

];

foreach ($rows as $row) {

    $courseDay = $row['course_day'];

    if (isset($timetable[$courseDay])) {

        $timetable[$courseDay][] = $row;

    }

}

首先创建索引作为工作日的时间表，然后如果工作日匹配则添加事件。它还允许您通过在时间表变量中添加或删除它们来限制您支持的日期。

Answer 2

尝试这样做

foreach ($rows as $row) {

  switch ($row['course_day']) {

    case "Monday":

      $timetable['Monday'][] = $row;

      break;

    case "Tuesday":

      $timetable['Tuesday'][] = $row;

      break;

    case "Wednesday":

      $timetable['Wednesday'][] = $row;

      break;

    case "Thursday":

      $timetable['Thursday'][] = $row;

      break;

    case "Friday":

      $timetable['Friday'][] = $row;

      break;

  }

}