Question

必须将关联数组数组转换为关联数组，其关键字是这些关联数组的一个键的值。例如，这个数组：

$source = array(array("key" => "a", "value" => "1"),
                array("key" => "b", "value" => "2"),
                array("key" => "a", "value" => "3"),
                array("key" => "b", "value" => "4"));

必须根据键＆＃34;键＆＃34; 的值转换为以下关联数组：

$dest = array("a" => array(array("key" => "a", "value" => "1"),
                           array("key" => "a", "value" => "3")),
              "b" => array(array("key" => "b", "value" => "2"),
                           array("key" => "b", "value" => "4")));

这就是我要做的事情：

$dest = array();
foreach($source as $elem) {
    $key = $elem["key"];
    if(!array_key_exists($key, $dest)){
        $dest[$key] = array();
    }
    array_push($dest[$key], $elem);
}

是否有更惯用的方式？

Answer 1

您可以使用简单的foreach内容：

$source_arr = array(array("key" => "a", "value" => "1"),
                array("key" => "b", "value" => "2"),
                array("key" => "a", "value" => "3"),
                array("key" => "b", "value" => "4"));

$destination_arr = array();
foreach ($destination_arr as $k => $v)
{
  $key = $v['key'];
  $destination_arr[$key][$k] = array('key' => $v['key'], 'value' => $v['value']);
}

print_r($destination_arr);

Answer 2

将您改为此。

Box<Option<Foo>>

请检查：https://eval.in/605983

输出是：

    <?php
        $dest = array(array("key" => "a", "value" => "1"),
                    array("key" => "b", "value" => "2"),
                    array("key" => "a", "value" => "3"),
                    array("key" => "b", "value" => "4"));
         $result = array();
        foreach($dest as $elem) {
            $result[$elem['key']][] = ["key"=>$elem['key'],"value"=>$elem['value']];
        }
        print_r($result);
    ?>

关联数组的关联数组数组，索引键的值

2 个答案: