从对象数组中提取值

Question

我有一个对象数组作为JSON响应的一部分进入，如下所示。我需要提取“值”字符串项之一。但是，问题在于某些“值”项是字符串，有些是字符串数组，有些是对象本身。有关如何进行此操作的任何建议？

这是我正在谈论的JSON部分（我需要提取员工编号的值）：

"meta_data": [
        {
            "id": 20,
            "key": "wc_last_active",
            "value": "1591574400"
        },
        {
            "id": 21,
            "key": "jetpack_tracks_anon_id",
            "value": "jetpack:XPs4qwPuwtU9/37vf635CIal"
        },
        {
            "id": 22,
            "key": "wpsl_disable_key_warning",
            "value": "true"
        },
        {
            "id": 26,
            "key": "nav_menu_recently_edited",
            "value": "52"
        },
        {
            "id": 27,
            "key": "managenav-menuscolumnshidden",
            "value": [
                "link-target",
                "css-classes",
                "xfn",
                "description",
                "title-attribute"
            ]
        },
        {
            "id": 40,
            "key": "dismissed_no_shipping_methods_notice",
            "value": "1"
        },
        {
            "id": 41,
            "key": "dismissed_no_secure_connection_notice",
            "value": "1"
        },
        {
            "id": 108,
            "key": "iconic-register-text",
            "value": "54321"
        },
        {
            "id": 111,
            "key": "employee_number",
            "value": "5432145623"
        },
        {
            "id": 199,
            "key": "tgmpa_dismissed_notice_tgmpa",
            "value": "1"
        },
        {
            "id": 207,
            "key": "community-events-location",
            "value": {
                "ip": "xxxxxxxxxxxx"
            }
        },
        {
            "id": 295,
            "key": "mobiconnector-avatar",
            "value": ""
        },
        {
            "id": 367,
            "key": "shipping_method",
            "value": ""
        },
        {
            "id": 368,
            "key": "shipping_email",
            "value": "xxxxxxxxxxx"
        },
        {
            "id": 369,
            "key": "shipping_phone",
            "value": "xxxxxxxxxx"
        },
        {
            "id": 579,
            "key": "dismissed_update_notice",
            "value": "1"
        },
        {
            "id": 800,
            "key": "supsystic-tables-tutorial_was_showed",
            "value": "1"
        },
        {
            "id": 801,
            "key": "dismissed_template_files_notice",
            "value": "1"
        },
        {
            "id": 804,
            "key": "managetablepress_listcolumnshidden",
            "value": [
                "table_last_modified_by"
            ]
        },
        {
            "id": 1849,
            "key": "edit_shop_order_per_page",
            "value": "100"
        }
    ]