PHP中多维数组格式的更改

Question

如何在PHP中更改第一个数组，如最后一个数组？

Array ( [0] => Array ( [month] => 2007-02 [clicks] => 94 ) 
        [1] => Array ( [month] => 2007-03 [clicks] => 6930 )
        [2] => Array ( [month] => 2007-04 [clicks] => 4 ) 
        ....
        [11] => Array ( [month] => 2008-01 [clicks] => 1008)
        [12] => Array ( [month] => 2008-02 [clicks] => 7 ) 
      )
Array ( [2007] => Array(
                        [0] => Array ( [month] => 1 [clicks] => 94 ) 
                        [1] => Array ( [month] => 2 [clicks] => 6930 )
                        [2] => Array ( [month] => 3 [clicks] => 4 )
                        ...
                       ),
        [2008] => Array(
                        [0] => Array ( [month] => 1 [clicks] => 1008) 
                        [1] => Array ( [month] => 2 [clicks] => 7 )
                       )
      )

请帮忙？

Answer 1

这类工作是手动完成的。。只需分解问题并逐步解决即可。

$start = array();
$start[] = array("month"=>"2007-02","clicks"=>94);
$start[] = array("month"=>"2007-03","clicks"=>6930);
$start[] = array("month"=>"2007-04","clicks"=>4);
.....this is just for setup of testing.... 
$end = array();
foreach ($start as $record) {
    $keys = explode("-",$record['month']);
    $year = $keys[0];
    $month = $keys[1];
    if (!isset($end[$year])) $end[$year] = array();
    $end[$year][] = array("month"=>$month, "clicks"=>$record['clicks']);
}
var_dump($end);

设置一个最终数组（本例中为$end），然后循环遍历初始数组（本示例中为$start）。细分月份值以获得年份和月份。检查年份是否已添加到最终数组中，如果没有创建，则将记录添加为根据现有值构建的新数组。最后，您得到了所需的格式。

Answer 2

$newArray = array();
foreach($oldArray as $row) {
    list($year, $month) = explode($row['month']);
    $newArray[$year][(int)$month] = array( 
        'month' => (int)$month,  // this is in fact redundant - you have it in the index aleready
        'clicks' => $row['clicks'];
    );
}