Question

我有一个带有空键值的多维数组。如何在多维数组php中将null替换为空字符串？我的数组是

"result": [
    {
      "id": "1",
      "first_name": "Kishan",
      "last_name": "Patel",
      "profile_picture": null,
      "email": "imkishanpatel107@gmail.com",
      "birthdate": "1992-07-10",
      "gender": "male",
      "nickname": "KK",
      "town": null,
      "state": "58",
      "bio": "123",
      "zipcode": "395006",
      "radius": "12356",
      "favroiteteam": "2",
      "latitude": "1.25456",
      "longitude": "4.5658787",
      "message_enable": "0",
      "ratting_enable": "0",
      "add_friend_enable": "0",
      "interested_in": null,
      "user_sport": [
        {
          "sport": {
            "id": "3",
            "name": "Basketball",
            "image": "",
            "no_of_player": "9",
            "is_active": "1"
          },
          "sportPosition": {
            "id": "1",
            "sport_id": "3",
            "position_name": "Point Guard"
          },
          "skill_level": {
            "id": "1",
            "name": "Novice"
          }
        },
        {
          "sport": {
            "id": "2",
            "name": "Baseball",
            "image": "",
            "no_of_player": "10",
            "is_active": "1"
          },
          "sportPosition": {
            "id": "6",
            "sport_id": "2",
            "position_name": "Pitcher"
          },
          "skill_level": {
            "id": "3",
            "name": "Advanced"
          }
        },
        {
          "sport": {
            "id": "8",
            "name": "Roller Hockey",
            "image": "",
            "no_of_player": "0",
            "is_active": "1"
          },
          "sportPosition": {
            "id": "15",
            "sport_id": "8",
            "position_name": "Forward"
          },
          "skill_level": {
            "id": "1",
            "name": "Novice"
          }
        }
      ]
    }
  ]

Answer 1

@Kishan Kikani你不能将null替换为''，因为两者都认为是空值，在数组的输出中，在null的位置会有空值或''你需要指定一些东西来替换你的值如上所示，你可以做到两种方式（你和我的）：

<?php
$result =   array("result"=> 
                array(
                  "id"=> "1",
                  "first_name"=> "Kishan",
                  "last_name"=> "Patel",
                  "profile_picture"=> null,
                  "email"=> "imkishanpatel107@gmail.com",
                  "birthdate"=> "1992-07-10",
                  "gender"=> "male",
                  "nickname"=> "KK",
                  "town"=> null,
                  "state"=> "58",
                  "bio"=> "123",
                  "zipcode"=> "395006",
                  "radius"=> "12356",
                  "favroiteteam"=> "2",
                  "latitude"=> "1.25456",
                  "longitude"=> "4.5658787",
                  "message_enable"=> "0",
                  "ratting_enable"=> "0",
                  "add_friend_enable"=> "0",
                  "interested_in"=> null,
                  "user_sport"=> 
                    array(
                      "sport"=> array(
                        "id"=> "3",
                        "name"=> "Basketball",
                        "image"=> "",
                        "no_of_player"=> "9",
                        "is_active"=> "1"
                      ),
                      "sportPosition"=> array(
                        "id"=> "1",
                        "sport_id"=> "3",
                        "position_name"=> "Point Guard"
                      ),
                      "skill_level"=> array(
                        "id"=> "1",
                        "name"=> "Novice"
                      )
                    ),
                    array(
                      "sport"=> array(
                        "id"=> "2",
                        "name"=> "Baseball",
                        "image"=> "",
                        "no_of_player"=> "10",
                        "is_active"=> "1"
                      ),
                      "sportPosition"=> array(
                        "id"=> "6",
                        "sport_id"=> "2",
                        "position_name"=> "Pitcher"
                      ),
                      "skill_level"=> array(
                        "id"=> "3",
                        "name"=> "Advanced"
                      )
                    ),
                    array(
                      "sport"=> array(
                        "id"=> "8",
                        "name"=> "Roller Hockey",
                        "image"=> "",
                        "no_of_player"=> "0",
                        "is_active"=> "1"
                      ),
                      "sportPosition"=> array(
                        "id"=> "15",
                        "sport_id"=> "8",
                        "position_name"=> "Forward"
                      ),
                      "skill_level"=> array(
                        "id"=> "1",
                        "name"=> "Novice"
                      )
                    )
                )
            );
echo "<pre>";
print_r($result); // BEFORE


foreach($result as $rsKey => $rs){
    foreach($rs as $key => $value){
        if(is_null($value)){
            $result[$rsKey][$key] = "";
        }
    }
}
echo "<pre>";
print_r($result); // after replace only null to "" but there will be a empty space in the values



foreach($result as $rsKey => $rs){
    foreach($rs as $key => $value){
        if(is_array($value)){   
            foreach ($value as $k => $v) {
                foreach ($v as $k1 => $v1) {
                    if(empty($v1)){
                        $result[$rsKey][$key][$k][$k1] = "level2";
                    }
                }
            }
        }
        else{
            if(is_null($value)){
                $result[$rsKey][$key] = "level1";
            }
        }
    }
}
echo "<pre>";
print_r($result); // after replace whole array empty values

尝试任何你想要的（y）

Answer 2

$arr = array(
          "key1"=>"value1",
          "key2"=>null,
          "key3"=>array(
                 "subkey1"=>null, 
                 "subkey2"=>"subvalue2"),
          "key4"=>null);

    echo json_encode(replace_null_with_empty_string($arr));

   function replace_null_with_empty_string($array)
    {
        foreach ($array as $key => $value) 
        {
            if(is_array($value))
                $array[$key] = replace_null_with_empty_string($value);
            else
            {
                if (is_null($value))
                    $array[$key] = "";
            }
        }
        return $array;
    }

Answer 3

Pi带@Atish的答案...我清理了它并简化了它。这将遍历数组并更改值引用（＆），然后使用递归遍历数组的每个下一维。 @Daidon的答案只循环到第一个维度。

新功能看起来像这样...

    function null2empty($array){
        foreach ($array as &$value) {
            $value = (is_array($value)) ? null2empty($value) : $value;
            $value = (is_null($value)) ? "" : $value;
        }
        return $array;
    }

要使用它，您会这样称呼它...

$profile_array = null2empty($profile_array);

Answer 4

只需放置一个循环并检查是否为foreach

foreach ($array as $key => $value) {
    if (is_null($value)) $array[$key] = "";
}

在多维数组php中用空字符串值替换null

4 个答案: