如何遍历语句结果以插入 PHP 中的关联数组

Question

我似乎无法获得正确的语法来循环遍历我的结果并将它们插入关联数组 - 目前它只给我第一个结果而不循环其余的结果。我尝试了 foreach 等的多种组合，但无法成功完成此操作。

这是我的代码：

$count = array(
    "timeinsert"=>"value",
    "rfid"=>"value"
  );
  
  $readlags = "SELECT id_arduino, Device_id,time_inserted, message, message_type,
                    LAG(message) OVER(PARTITION BY device_id ORDER BY time_inserted) 
                    AS 'Previous Entry'
                    FROM Arduino_Data 
                    WHERE Datediff(Curdate(), time_inserted) < $period AND Device_id = $device AND message != 2
                    GROUP BY time_inserted ASC";
  
  $result = $conn->query($readlags);
  
  if (!$result) {
      echo $conn->error;
  }
  
  while ($row = mysqli_fetch_array($result)) {
      $eventtime = $row['time_inserted'];
      $message = $row['message'];
      $message_type = $row['message_type'];
      $previous = $row['Previous Entry'];
  
      if ($previous != 'Broken' and $previous != null) {
          $catid = "SELECT RFID_id
                    FROM Cat_User
                    WHERE RFID_id = $previous ";
  
          $result1 = $conn->query($catid);
  
          if (!$result1) {
              echo $conn->error;
          }
          while ($row1 = mysqli_fetch_array($result1)) {
              $cat_id = $row1['RFID_id'];
              //echo $cat_id . '<br>';
  
              }
          }
  
       
          if ($message == "Broken" && $message_type == "BreakBeam" && $previous==$cat_id) {
              
            
            $count["timeinsert"] = $eventtime;
              $count["rfid"]=$previous;

          }
            
      }       
  

 
  print_r($count);

这是输出：

Array
(
    [timeinsert] => 2020-09-17 16:02:44
    [rfid] => 5609
)

当我执行 array_push 时，结果如下：

Array
(
    [0] => 2020-09-17 15:51:37
    [1] => 23641
    [2] => 2020-09-17 15:52:20
    [3] => 5609
    [4] => 2020-09-17 15:53:23
    [5] => 5609
    [6] => 2020-09-17 16:02:44
    [7] => 5609
)

Answer 1

这是因为您在同一个变量中覆盖了所有结果，所以当您打印结果时，您会看到最后写入变量的数据。

1) 将 $count 定义为数组，将 $c 定义为对数组元素进行计数，如下所示

$count = array();
$c=0;

2) 当你想保存新数据，但它是这样的多维数组时：

$count[$c]["timeinsert"] = $eventtime;
$count[$c]["rfid"]=$previous;
$c++;

3) 像这样检索您的数据：

$c=count($count);
for($i=0;$i<$c;$i++){
    echo $count[$i]["timeinsert"];
    echo $count[$i]["rfid"];
}

如何遍历语句结果以插入 PHP 中的关联数组

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