Question

我正在尝试将关联数组从Drupal数据库转换为可以编码为json的多维数组。

我从：

开始

$notifications =`

    Array
    (
    [0] => Array
        (
            [rfp_id] => RFP-013-2014(C)
            [notification_type] => due_date
        )

    [1] => Array
        (
            [rfp_id] => RFP-013-2014(C)
            [notification_type] => changes
        )

    [2] => Array
        (
            [rfp_id] => RFP-013-2014(C)
            [notification_type] => due_date
        )

    [3] => Array
        (
            [rfp_id] => RFP-014-2014(C)
            [notification_type] => due_date
        )

    [4] => Array
        (
            [rfp_id] => RFP-014-2014(C)
            [notification_type] => changes
        )
    )

我想通过rfp_id字段进行分组，最后得到类似的结果：

Array (
  [0]=> Array (
    ["rfp_id"]=>"RFP-014-2014"
    ["notification_type"]=>
    Array (
      [0]=> "date_due"
      [1]=> "changes"
    )
  )
)

如何循环使用此数组来创建它？

Answer 1

阵列的维度没有变化，只是重组了。你可以这样做：

foreach ($notifications as $notification)
{
  $rfp_id = $notification['rfp_id'];
  $newArray[$rfp_id]['rfp_id'] = $rfp_id;
  $newArray[$rfp_id]['notification_type'][] = $notification['notification_type'];
} 
echo '<pre>'.print_r($newArray,TRUE).'</pre>';

正如您所看到的，我已经完成了与指定的略有不同，只是因为它更容易。如果你想要数字键，你可以这样做：

$newArray = array_values($newArray);

Answer 2

<?
$result = array();

foreach ($notifications as $key => $note) {
    $result[$note['rfp_id']]['rfp_id'] = $note['rfp_id'];
    $result[$note['rfp_id']]['notification_type'][] = $note['notification_type'];

}

echo '<pre>';
print_r($result);
echo '</pre>';

?>

应该这样做。由于您在我假设您不需要将密钥重置为数字后立即插入数据库。

Answer 3

这样的事情会起作用：

$ array = array（）;

//loop over the array
foreach($notifications as $row){
    //if this rfp id doesn't exist, add it
    if(!isset($array[$row['rfp_id']])){
        //add the first entry in the array
        $array[$row['rfp_id']] = array(
                'rfp_id'=>$row['rfp_id'],
                'notification_type'=>array(
                    $row['notification_type']
                )
            );
    } else {
        //rfp_id exists, so just append the notification type
        $array[$row['rfp_id']]['notification_type'][] = $row['notification_type'];
    }
}
//get just the values to reset the first level keys to numeric.
$array = array_values($array);

//display the array
echo '<pre>'.print_r($array,true).'</pre>';

从数组创建多维数组

3 个答案: