Question

我有一个名为 $ output 的数组。如果我做以下事情......

<?php
print_r($output);
?>

......数组的内容看起来像这样......

Array ( [id] => 116 [the_key] => monday    [value] => 0 )
Array ( [id] => 116 [the_key] => tuesday   [value] => 1 )
Array ( [id] => 116 [the_key] => wednesday [value] => 0 )
Array ( [id] => 133 [the_key] => monday    [value] => 0 )
Array ( [id] => 133 [the_key] => tuesday   [value] => 1 )
Array ( [id] => 133 [the_key] => wednesday [value] => 0 )
Array ( [id] => 127 [the_key] => monday    [value] => 0 )
Array ( [id] => 127 [the_key] => tuesday   [value] => 0 )
Array ( [id] => 127 [the_key] => wednesday [value] => 0 )

...但我想以这样的形式提供内容......

Array ( [id] => 116 [monday] => 0 [tuesday] => 1 [wednesday] => 0)
Array ( [id] => 133 [monday] => 0 [tuesday] => 1 [wednesday] => 0)
Array ( [id] => 127 [monday] => 0 [tuesday] => 0 [wednesday] => 0)

有没有一些方法可以做到这一点而不需要循环一百万次？

Answer 1

我不知道这是否属于“循环一百万次”，但为什么不尝试按id对项目进行分组？

$newArray = array();

for($i = 0; $i < sizeof($output); $i++) {
    $curr = $output[$i];
    $id = $curr["id"];
    $day = $curr["the_key"];
    $value = $curr["value"];
    if(array_key_exists($id, $newArray)) {
        $newArray[$id][$day] = $value;
    } else {
        $newArray[$id] = array($day => $value);
    }
}

根据我收集的内容，$newArray应该符合您的规范。

在PHP中压缩多维数组？

1 个答案: