如何在php中推送多维数组中的值

Question

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

$clollege['studentDetails'] 等级和$classType 等级相同。

预期输出

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

        )

我已经尝试但没有达到预期的答案，请任何人更新我的答案，我已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 怎么推

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式。

$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" ] ]
];

$classType = array_column($classType, 'type', "class");
array_walk($clollege['studentDetails'], function(&$item) use($classType) {
    $item['type'] = $classType[$item['grade']];
});

echo '<pre>';
print_r($clollege['studentDetails']);
echo '</pre>';

工作demo。

Answer 2

您不能在单个或子数组元素中使用 grade 作为键 2 次，我已经提到了使用 type 索引的解决方案。

您可以将foreach 与array_reduce 一起使用

 foreach($clollege['studentDetails'] as $key => &$val){
    $grade       = $val['grade'];
    $val['type'] = array_reduce($classType, function($r, $item) use ($grade){
      return ($item['class'] == $grade) ? $item['type'] : $r;
    }); 
  }
  print_r($clollege);

更新

修改代码

$grade = $val['grade'];

到

$grade = $val['group']['grade'];

如果两种情况都有机会使用

$grade  = isset($val['group']['grade']) ? $val['group']['grade'] : $val['grade'];

工作演示：https://3v4l.org/5HGLk