php - 在php中获取多维数组中键的值

Question

在我的 php 查询中，我得到了这个输出：

{"projects":[{"id":127,"name":"efrat","status":{"id":10,"name":"development","label":"development"},"description":"","enabled":true,"view_state":{"id":10,"name":"public","label":"public"},"access_level":{"id":90,"name":"administrator","label":"administrator"},"custom_fields":[{"id":1,"name":"Customer email","type":"email","default_value":"","possible_values":"","valid_regexp":"","length_min":0,"length_max":50,"access_level_r":{"id":10,"name":"viewer","label":"viewer"},"access_level_rw":{"id":10,"name":"viewer","label":"viewer"},"display_report":true,"display_update":true,"display_resolved":true,"display_closed":true,"require_report":false,"require_update":false,"require_resolved":false,"require_closed":false}],"versions":[],"categories":[{"id":93,"name":"Monitor","project":{"id":0,"name":null}},{"id":31,"name":"Proactive","project":{"id":0,"name":null}},{"id":30,"name":"Project","project":{"id":0,"name":null}},{"id":29,"name":"Support","project":{"id":0,"name":null}}]}]}

在对它使用'json_decode'方法后，我得到了这个：“（

[projects] => Array
    (
        [0] => Array
            (
                [id] => 127
                [name] => myprojectname
                [status] => Array
                    (
                        [id] => 10
                        [name] => development
                        [label] => development
                    )

                [description] =>
                [enabled] => 1
                [view_state] => Array
                    (
                        [id] => 10
                        [name] => public
                        [label] => public
                    )

                [access_level] => Array
                    (
                        [id] => 90
                        [name] => administrator
                        [label] => administrator
                    )

                [custom_fields] => Array
                    (
                        [0] => Array
                            (
                                [id] => 1
                                [name] => Customer email
                                [type] => email
                                [default_value] =>
                                [possible_values] =>
                                [valid_regexp] =>
                                [length_min] => 0
                                [length_max] => 50
                                [access_level_r] => Array
                                    (
                                        [id] => 10
                                        [name] => viewer
                                        [label] => viewer
                                    )

                                [access_level_rw] => Array
                                    (
                                        [id] => 10
                                        [name] => viewer
                                        [label] => viewer
                                    )

                                [display_report] => 1
                                [display_update] => 1
                                [display_resolved] => 1
                                [display_closed] => 1
                                [require_report] =>
                                [require_update] =>
                                [require_resolved] =>
                                [require_closed] =>
                            )

                    )

                [versions] => Array
                    (
                    )

                [categories] => Array
                    (
                        [0] => Array
                            (
                                [id] => 93
                                [name] => Monitor
                                [project] => Array
                                    (
                                        [id] => 0
                                        [name] =>
                                    )

                            )

                        [1] => Array
                            (
                                [id] => 31
                                [name] => Proactive
                                [project] => Array
                                    (
                                        [id] => 0
                                        [name] =>
                                    )

                            )

                        [2] => Array
                            (
                                [id] => 30
                                [name] => Project
                                [project] => Array
                                    (
                                        [id] => 0
                                        [name] =>
                                    )

                            )

                        [3] => Array
                            (
                                [id] => 29
                                [name] => Support
                                [project] => Array
                                    (
                                        [id] => 0
                                        [name] =>
                                    )

                            )

                    )

            )

    )

)"

在我的 PHP 中，如何从这个数组中释放“name”对象值（结果应该是 'myprojectname'）？我尝试了许多 foreach 循环，但都无济于事。

谢谢，

标签： phparraysjsondecoder

Answer 1

您的“项目”包含一个数组 ( "projects":[{"id":127, ... }])。我假设“项目”数组可能包含多个这样的“项目”对象？

{
    "projects":
    [
        {
            "id":127,
            "name":"my-project"
        },
        {
            "id":128,
            "name":"my-other-project"
        }
    ]
}

在这种情况下，您需要箭头符号来访问 name 属性，例如：

foreach ($projects as $project_object) {
    foreach ($project_object as $project) {
        echo $project->name . '<br/>';
    }
}

编辑：

我采用了 OP 的最小代码示例并得到了预期的结果：

您能否在原始问题的代码片段中添加更多详细信息或向我们提供您的代码的工作示例？有一些在线 PHP 沙箱可以帮助您解决这个问题。例如：我删除了所有似乎与您的问题无关的代码，并以两种不同的方式获得了您正在寻找的结果：http: //sandbox.onlinephpfunctions.com/code/009c53671fd9545e4fcecfe4b0328974381ee2ce

总结您已经尝试过的所有 foreach 循环也是一个好主意，这样我们就可以看到您是否已经有了自己的解决方案。这样，我们可以更好地理解您的问题，并阻止我们提供您已经使用过的解决方案。