如何在php中推送多维数组中的值

Question

$classType 数组我正在存储类明智的类型，例如具有类型 A 的类 1 和具有类型的类 2 是 A 和具有类型的类 3 是 B

$clollege['studentDetails']数组我想根据类从$classType数组中推送类型是什么类型

$clollege['studentDetails']年级和$classType班级都是一样的。

预期产出

Array

(

    [0] => Array

        (

            [grade] => 2

            [hobbies] => Array

                (

                    [0] => A

                    [1] => B

                )

        [type] => A

        )

    [1] => Array

        (

            [grade] => 2

            [hobbies] => Array

                (

                    [0] => A

                )

           [type] => A

        )

    [2] => Array

        (

            [grade] => 3

            [hobbies] => Array

                (

                    [0] => C

                )

        [type] => A

        )

我已经尝试过但没有达到我预期的答案，请任何人更新我的答案，我已经在下面的部分中发布了我的代码。我知道这是一个简单的问题，如果有人发布你的，以便我可以从这里学习如何推动

我的代码

<?php

$classType = [

    ["class" => "1", "type" => "A"],

    ["class" => "2", "type" => "A"],

    ["class" => "3", "type" => "B"]

];

$clollege['studentDetails'] = [

   ["grade" => "2", "hobbies" => ["A" , "B"] ],

   ["grade" => "2", "hobbies" => ["A" ] ],

   ["grade" => "3", "hobbies" => [ "C" ] ]

];

foreach ($classType as $item) {

        $clollege['studentDetails'][$item['class']]['type'] = $item['type'];

}

echo "<pre>";

print_r($clollege['studentDetails']);exit;

?>

更新代码部分

$studentList['studentDetails'] = [

    [ "group" => ["id" => 1 , "grade" => "2"] ],

    [ "group" => ["id" => 2 , "grade" => "2", ] ],

    [ "group" => [ "id" => 3, "grade" => "3"] ]

];

Answer 1

您可以在array_walk()的帮助下尝试以下方法。$classType = [&nbsp; &nbsp; ["class" => "1", "type" => "A"],&nbsp; &nbsp; ["class" => "2", "type" => "A"],&nbsp; &nbsp; ["class" => "3", "type" => "B"]];$clollege['studentDetails'] = [&nbsp; &nbsp; ["grade" => "2", "hobbies" => ["A" , "B"] ],&nbsp; &nbsp; ["grade" => "2", "hobbies" => ["A" ] ],&nbsp; &nbsp; ["grade" => "3", "hobbies" => [ "C" ] ]];$classType = array_column($classType, 'type', "class");array_walk($clollege['studentDetails'], function(&$item) use($classType) {&nbsp; &nbsp; $item['type'] = $classType[$item['grade']];});echo '<pre>';print_r($clollege['studentDetails']);echo '</pre>';

Answer 2

您不能grade在单个或子数组元素中用作键 2 次，我已经通过使用type索引提到了解决方案。你可以用foreach与array_reduce&nbsp;foreach($clollege['studentDetails'] as $key => &$val){&nbsp; &nbsp; $grade&nbsp; &nbsp; &nbsp; &nbsp;= $val['grade'];&nbsp; &nbsp; $val['type'] = array_reduce($classType, function($r, $item) use ($grade){&nbsp; &nbsp; &nbsp; return ($item['class'] == $grade) ? $item['type'] : $r;&nbsp; &nbsp; });&nbsp;&nbsp; }&nbsp; print_r($clollege);更新更改代码$grade = $val['grade'];到$grade = $val['group']['grade'];如果有机会为这两种情况使用$grade&nbsp; = isset($val['group']['grade']) ? $val['group']['grade'] : $val['grade'];工作演示：https : //3v4l.org/5HGLk