Php 使用动态键字符串检索对象变量

我有一个PHP对象，其属性名为“required”。此“必填”字段是嵌套数组。我想用动态字符串（用于属性名和数组索引）从此对象检索所需的键。我怎样才能做到这一点

$myObj = new StdClass;
$myObj->required = array(
        "name_required" => 1,
        "courses" => array(
                "course_name_required" => 1,
                "lessons_required" => 1,
                "lessons" => array(
                        "lesson_name_required" => 1,
                        "lesson_file_required" => 1,
                        "is_viewed_required" => 1,
                    ),
            ),

);
// Desired Key I want to retrieve using dynamic strings.
$desiredKeyArrayPart = "[courses][lessons][lesson_name_required]";
$desiredKeyAttributePart = "required";
$desiredKey = $desiredKeyAttributePart . $desiredKeyArrayPart;

// Get the value (Should return 1)
$desiredValue = $myObj->$desiredKey;

我希望返回值1，但这会引发运行时错误： PHP通知：未定义属性：stdClass:：$required[课程][课程][课程名称]

替换此：

$desiredKeyArrayPart = "[courses][lessons][lesson_name_required]";
$desiredKeyAttributePart = "required";
$desiredKey = $desiredKeyAttributePart . $desiredKeyArrayPart;

// Get the value (Should return 1)
$desiredValue = $myObj->$desiredKey;

据此：

$desiredValue = $myObj->required['courses']['lessons']['lesson_name_required'];

---

你试图这样做是行不通的。此外，最好引用数组值以避免警告。

$desiredKey

的值是

必修[课程][课程][课程名称][必修]

。那不是一种财产。现在，

$desiredKey

只是一个字符串。PHP不会解释字符串以访问数组属性。您还忘记了数组键周围的引号。您可以通过以下方式访问所需的值：

$desiredValue = $myObj->required["courses"]["lessons"]["lesson_name_required"];

---

我假设您知道如何正确访问对象/数组，并尝试动态生成所需值的路径。下面的代码将允许您传递字符串，并通过对象筛选该字符串中的多个键

<?php
$myObj = new StdClass;
$myObj->required = array(
  "name_required" => 1,
  "courses" => array(
    "course_name_required" => 1,
    "lessons_required" => 1,
    "lessons" => array(
      "lesson_name_required" => 1,
      "lesson_file_required" => 1,
      "is_viewed_required" => 1,
    ),
  ),
);
// Desired Key I want to retrieve using dynamic strings.
$desiredKeyArrayPart = "[courses][lessons][lesson_name_required]";
$desiredKeyAttributePart = "required";

// Set our searchObject to $myObj->required using Variable Variables
$searchObject = $myObj->$desiredKeyAttributePart;
// Match all of the keys in our string
preg_match_all('/\[(.*?)\]/', $desiredKeyArrayPart, $keyMap);
// Foreach key that we found
foreach ($keyMap[1] as $key) {
  // Change our $searchObject to the new key's value
  $searchObject = $searchObject[$key];
}
// We found our object
var_dump($searchObject);

---

正是我想要的。谢谢