PHP拼接数组

最新推荐文章于 2025-05-29 10:07:05 发布

chuoquerun2668

最新推荐文章于 2025-05-29 10:07:05 发布

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文章标签： php

原文链接：https://my.oschina.net/helloworldcoding/blog/777432

版权

/*
$score是某次考试的成绩数据，小明想把数组进行重组拼接为如下格式：
array(
      [1] => Array
        (
            [id] => 1
            [name] => zhansan
            [exam] => Array
                (
                    [0] => Array
                        (
                            [subject] => math // zhansan参加了两场考试，math得分90，music得分80
                            [score] => 90
                        )
                    [1] => Array
                        (
                            [subject] => music
                            [score] => 80
                        )
                    ....
                )

        ),
    [2] => array(),
    ....
    [id] =>array(),
);
*/
$score = array(
    array('id'=>1,'name'=>'zhansan','subject'=>'math','score'=>98),
    array('id'=>1,'name'=>'zhansan','subject'=>'music','score'=>80),
    array('id'=>2,'name'=>'lisi','subject'=>'math','score'=>60),
    array('id'=>2,'name'=>'lisi','subject'=>'music','score'=>90),
);
$result = array();
foreach($score as $k => $v)
{
    $result[$v['id']] = array(
        'id'   => $v['id'],
        'name'  => $v['name'],
    );
    $result[$v['id']]['exam'][] = array(
        'subject' => $v['subject'],
        'score'  => $v['score'],
    );
}
echo '<pre>';
print_r($result);

没想到，结果居然如下:

>Array
(
    [1] => Array
        (
            [id] => 1
            [name] => zhansan
            [exam] => Array
                (
                    [0] => Array
                        (
                            [subject] => music
                            [score] => 80
                        )

                )

        )

    [2] => Array
        (
            [id] => 2
            [name] => lisi
            [exam] => Array
                (
                    [0] => Array
                        (
                            [subject] => music
                            [score] => 90
                        )

                )

        )

)

好像是$result[$v['id']]['exam']这个变量，在foreach循环中，每次都会初始化，最后只是保存了，最后一次赋值。感觉自己一直写代码的根基都动摇了。

返回打印输出后，找到如下方案：

$data = array();
foreach($score as $k => $v)
{
    $result[$v['id']] = array(
        'id' => $v['id'],
        'name' => $v['name'],
    );
    $data[$v['id']]['exam'][] = array(
        'subject' => $v['subject'],
        'score'   => $v['score'],
    );
    $result[$v['id']]['exam'] = $data[$v['id']]['exam'];
}
echo '<pre>';
print_r($result);

最后小明想要的结果终于输入的，如下，但是还是不愉快。

Array
(
    [1] => Array
        (
            [id] => 1
            [name] => zhansan
            [exam] => Array
                (
                    [0] => Array
                        (
                            [subject] => math
                            [score] => 98
                        )

                    [1] => Array
                        (
                            [subject] => music
                            [score] => 81
                        )

                )

        )

    [2] => Array
        (
            [id] => 2
            [name] => lisi
            [exam] => Array
                (
                    [0] => Array
                        (
                            [subject] => math
                            [score] => 60
                        )

                    [1] => Array
                        (
                            [subject] => music
                            [score] => 90
                        )

                )

        )

)

转载于:https://my.oschina.net/helloworldcoding/blog/777432