PHP implements recursive deletion of a value in a multidimensional array-PHP Tutorial-php.cn

PHP implements recursive deletion of a value in a multidimensional array

墨辰丷

Release： 2023-03-27 17:54:01

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这篇文章主要介绍了PHP递归删除多维数组中的某个值,需要的朋友可以参考下

今天在做业务逻辑的过程中，需要在一个不确定的多维数组中删除某个特定的key,查了挺长时间加上自己的修改，终于满足了业务逻辑，该方法在修改后应该可以适用于很多地方，所以记录下来以备后用，我这里是一个多维数组，还是json_encode后的，主要目的是删除所有old_tags_id数组中有tag_id=264的数据，顺便要删除相应的tag_name，还有 addtag要减1,，代码如下:

先放递归函数，当然这里是核心，很多人看了这个应该就已经知道如何使用了.

public function dealMenuTagDelete(&$menuData, $tag_id)
  {
    if (!is_array($menuData)) {
      return false;
    }
    foreach ($menuData as $key => $val) {
      if ($key === &#39;old_tags_id&#39;) {
        foreach ($val as $tagKey => $tagVaule) {
          if ($tagVaule == $tag_id) {
            unset($menuData[&#39;old_tags_id&#39;][$tagKey]);
            unset($menuData[&#39;old_tags&#39;][$tagKey]);
            $menuData[&#39;addtag&#39;]--;
          }
        }
      }
      if (is_array($val)) {
        self::dealMenuTagDelete($menuData[$key], $tag_id);
      }
    }
    return $menuData;
  }

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维数组长这样，还是jeson_encode后的格式:

[  {
    "typ": "res_ejcd",
    "tit": "message1",
    "data": "1@2@3",
    "subdata": {
      "zizicd1": {
        "typ": "res_wb",
        "data": "qqqq",
        "addtag": 1,
        "old_tags": [
          "\"campaign综合分析\"",
          "test add a tag"
        ],
        "old_tags_id": [
          "264",
          "17"
        ],
        "new_tags_id": [],
        "tit": "1"
      },
      "zizicd2": {
        "typ": "res_wb",
        "data": "wwww",
        "addtag": 1,
        "old_tags": [
          "test add a tag"
        ],
        "old_tags_id": [
          "17"
        ],
        "new_tags_id": [],
        "tit": "2"
      },
      "zizicd3": {
        "typ": "res_wb",
        "data": "ddd",
        "addtag": 1,
        "old_tags": [],
        "old_tags_id": [],
        "new_tags_id": [
          "new_tag1"
        ],
        "tit": "3"
      }
    },
    "addtag": 0,
    "old_tags": [],
    "old_tags_id": [],
    "new_tags_id": []
  },
  {
    "typ": "res_tw",
    "tit": "Post",
    "data": "2121",
    "subdata": null,
    "addtag": 1,
    "old_tags": [
      "“519引号阅读user message图文”"
    ],
    "old_tags_id": [
      "183"
    ],
    "new_tags_id": []
  },
  {
    "typ": "res_wb",
    "tit": "Today1",
    "data": "12312321",
    "subdata": null,
    "addtag": 1,
    "old_tags": [],
    "old_tags_id": [],
    "dynamicdata": "{\"default\":{\"message_type\":\"1\",\"val\":\"dynamic\"},\"segementation\":[{\"segId\":\"451\",\"message_type\":\"1\",\"val\":\"你属于conversation 80这一组\"},{\"segId\":\"450\",\"message_type\":\"1\",\"val\":\"poll-1212\\n有三个人，rainbow H T_T\"}]}",
    "configId": "2392",
    "new_tags_id": [
      "new_tag2"
    ]
  }
]

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然后赋值，调用

$tag_id = 264;
$menuData = json_decode($data,true);//这里第二个参数用true就会转化为数组了
self::dealMenuTagDelete($menuData,$tag_id);
print_r($menuData);

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以上就是本文的全部内容，希望对大家的学习有所帮助。