php中的json解码答案

【问题标题】：json decode in phpphp中的json解码
【发布时间】：2009-08-13 04:22:16
【问题描述】：

我有以下 json 字符串，我只想从中检索电子邮件地址。在php中怎么做？

{"communications":{"communication":[{"@array":"true","@id":"23101384","@uri":"xyz/v1/Communications/1111","household":{"@id":"111111","@uri":"xyz/v1/Households/5465465"},"person":{"@id":"","@uri":""},"communicationType":{"@id":"1","@uri":"xyz/v1/Communications/CommunicationTypes/1","name":"Home Phone"},"communicationGeneralType":"Telephone","communicationValue":"1111","searchCommunicationValue":"2693240758","listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:40:02"},{"@array":"true","@id":"11111","@uri":"xyz/v1/Communications/111111111","household":{"@id":"14436295","@uri":"xyz/v1/Households/11111"},"person":{"@id":"2222222","@uri":"xyz/v1/People/22222222"},"communicationType":{"@id":"2","@uri":"xyz/v1/Communications/CommunicationTypes/2","name":"Work Phone"},"communicationGeneralType":"Telephone","communicationValue":"11111","searchCommunicationValue":"789787987","listed":"false","communicationComment":null,"createdDate":"2009-08-09T15:49:27","lastUpdatedDate":"2009-08-11T23:40:02"},{"@array":"true","@id":"11111","@uri":"xyz/v1/Communications/11111","household":{"@id":"1111","@uri":"xyz/v1/Households/1111"},"person":{"@id":"244404","@uri":"xyz/v1/People/1111"},"communicationType":{"@id":"3","@uri":"xyz/v1/Communications/CommunicationTypes/3","name":"Mobile"},"communicationGeneralType":"Telephone","communicationValue":"22222","searchCommunicationValue":"5475454","listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:40:02"},{"@array":"true","@id":"15454","@uri":"xyz/v1/Communications/111111","household":{"@id":"14436295","@uri":"xyz/v1/Households/1111"},"person":{"@id":"244444474","@uri":"xyz/v1/People/111111"},"communicationType":{"@id":"4","@uri":"xyz/v1/Communications/CommunicationTypes/4","name":"Email"},"communicationGeneralType":"Email","communicationValue":"email@needthis.com","searchCommunicationValue":"email@needthis.com","listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:39:06"}]}}

【问题讨论】：

我希望这个问题刚刚出现：我有一个 JSON 编码的字符串，想从中检索电子邮件地址，但不明白如何使用 json_decode 并从结果中检索值。有人可以帮我在 PHP 中做到这一点。我习惯了更棘手的问题，而这个问题把我扔了。 :)
X-Ref: Able to see a variable in print_r()'s output, but not sure how to access it in code

标签： php json

【解决方案1】：

考虑到你有json_decoded 你这样的数据：

$data = json_decode($json);

你可以使用var_dump （好吧，如果与Xdebug 扩展一起使用，它的输出看起来会更好，顺便说一句，这在开发机器上很不错）数据：

// Allows you to know what's in the data ;-)
var_dump($data);

你会得到这样的东西：

object(stdClass)[1]
  public 'communications' => 
    object(stdClass)[2]
      public 'communication' => 
        array
          0 => 
            object(stdClass)[3]
              public '@array' => string 'true' (length=4)
              public '@id' => string '23101384' (length=8)
              public '@uri' => string 'xyz/v1/Communications/1111' (length=26)
              public 'household' => 
                object(stdClass)[4]
                  public '@id' => string '111111' (length=6)
                  public '@uri' => string 'xyz/v1/Households/5465465' (length=25)
              public 'person' => 
                object(stdClass)[5]
                  public '@id' => string '' (length=0)
                  public '@uri' => string '' (length=0)
              public 'communicationType' => 
                object(stdClass)[6]
                  public '@id' => string '1' (length=1)
                  public '@uri' => string 'xyz/v1/Communications/CommunicationTypes/1' (length=42)
                  public 'name' => string 'Home Phone' (length=10)
              public 'communicationGeneralType' => string 'Telephone' (length=9)
              public 'communicationValue' => string '1111' (length=4)
              public 'searchCommunicationValue' => string '2693240758' (length=10)
              public 'listed' => string 'true' (length=4)
              public 'communicationComment' => null
              public 'createdDate' => string '2008-11-10T12:31:26' (length=19)
              public 'lastUpdatedDate' => string '2009-08-11T23:40:02' (length=19)
          1 => 
            object(stdClass)[7]
              public '@array' => string 'true' (length=4)
              public '@id' => string '11111' (length=5)
              public '@uri' => string 'xyz/v1/Communications/111111111' (length=31)
              public 'household' => 
                object(stdClass)[8]
                  public '@id' => string '14436295' (length=8)
                  public '@uri' => string 'xyz/v1/Households/11111' (length=23)
              public 'person' => 
                object(stdClass)[9]
                  public '@id' => string '2222222' (length=7)
                  public '@uri' => string 'xyz/v1/People/22222222' (length=22)
              public 'communicationType' => 
                object(stdClass)[10]
                  public '@id' => string '2' (length=1)
                  public '@uri' => string 'xyz/v1/Communications/CommunicationTypes/2' (length=42)
                  public 'name' => string 'Work Phone' (length=10)
              public 'communicationGeneralType' => string 'Telephone' (length=9)
              public 'communicationValue' => string '11111' (length=5)
              public 'searchCommunicationValue' => string '789787987' (length=9)
              public 'listed' => string 'false' (length=5)
              public 'communicationComment' => null
              public 'createdDate' => string '2009-08-09T15:49:27' (length=19)
              public 'lastUpdatedDate' => string '2009-08-11T23:40:02' (length=19)
          2 => 
            object(stdClass)[11]
              public '@array' => string 'true' (length=4)
              public '@id' => string '11111' (length=5)
              public '@uri' => string 'xyz/v1/Communications/11111' (length=27)
              public 'household' => 
                object(stdClass)[12]
                  public '@id' => string '1111' (length=4)
                  public '@uri' => string 'xyz/v1/Households/1111' (length=22)
              public 'person' => 
                object(stdClass)[13]
                  public '@id' => string '244404' (length=6)
                  public '@uri' => string 'xyz/v1/People/1111' (length=18)
              public 'communicationType' => 
                object(stdClass)[14]
                  public '@id' => string '3' (length=1)
                  public '@uri' => string 'xyz/v1/Communications/CommunicationTypes/3' (length=42)
                  public 'name' => string 'Mobile' (length=6)
              public 'communicationGeneralType' => string 'Telephone' (length=9)
              public 'communicationValue' => string '22222' (length=5)
              public 'searchCommunicationValue' => string '5475454' (length=7)
              public 'listed' => string 'true' (length=4)
              public 'communicationComment' => null
              public 'createdDate' => string '2008-11-10T12:31:26' (length=19)
              public 'lastUpdatedDate' => string '2009-08-11T23:40:02' (length=19)
          3 => 
            object(stdClass)[15]
              public '@array' => string 'true' (length=4)
              public '@id' => string '15454' (length=5)
              public '@uri' => string 'xyz/v1/Communications/111111' (length=28)
              public 'household' => 
                object(stdClass)[16]
                  public '@id' => string '14436295' (length=8)
                  public '@uri' => string 'xyz/v1/Households/1111' (length=22)
              public 'person' => 
                object(stdClass)[17]
                  public '@id' => string '244444474' (length=9)
                  public '@uri' => string 'xyz/v1/People/111111' (length=20)
              public 'communicationType' => 
                object(stdClass)[18]
                  public '@id' => string '4' (length=1)
                  public '@uri' => string 'xyz/v1/Communications/CommunicationTypes/4' (length=42)
                  public 'name' => string 'Email' (length=5)
              public 'communicationGeneralType' => string 'Email' (length=5)
              public 'communicationValue' => string 'email@needthis.com' (length=18)
              public 'searchCommunicationValue' => string 'email@needthis.com' (length=18)
              public 'listed' => string 'true' (length=4)
              public 'communicationComment' => null
              public 'createdDate' => string '2008-11-10T12:31:26' (length=19)
              public 'lastUpdatedDate' => string '2009-08-11T23:39:06' (length=19)

这意味着您应该能够通过以下方式访问您正在寻找的数据：

foreach ($data->communications->communication as $communication) {
    if ($communication->communicationGeneralType == 'Email') {
        var_dump($communication->communicationValue);
        var_dump($communication->searchCommunicationValue);
    }
}

这会得到你：

string 'email@needthis.com' (length=18)
string 'email@needthis.com' (length=18)

“communications”是一个对象，其中包含“communication”，它是一个对象数组，每个对象都包含一个communicationGeneralType，可以让你判断当前通信是否为EMail。

如果是，您可以使用communicationValue 或searchCommunicationValue 字段。

如果不遍历每个 communication 元素，我真的看不到这样做的方法...

希望这会有所帮助！

【讨论】：

【解决方案2】：

另一个关于访问它是多么惰性的转折：

$json_object = '{"communications":
                       {"communication":
                         [{"@array":"true","@id":"23101384","@uri":"xyz/v1/Communications/1111","household":
                            {"@id":"111111","@uri":"xyz/v1/Households/5465465"},
                            "person": {"@id":"","@uri":""},
                            "communicationType":{"@id":"1","@uri":"xyz/v1/Communications/CommunicationTypes/1","name":"Home Phone"},
                            "communicationGeneralType":"Telephone","communicationValue":"1111","searchCommunicationValue":"2693240758",
                               "listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:40:02"},
                            {"@array":"true","@id":"11111","@uri":"xyz/v1/Communications/111111111","household":
                              {"@id":"14436295","@uri":"xyz/v1/Households/11111"},
                            "person": {"@id":"2222222","@uri":"xyz/v1/People/22222222"},
                            "communicationType": {"@id":"2","@uri":"xyz/v1/Communications/CommunicationTypes/2","name":"Work Phone"},
                            "communicationGeneralType":"Telephone","communicationValue":"11111","searchCommunicationValue":"789787987","listed":"false",
                                "communicationComment":null,"createdDate":"2009-08-09T15:49:27","lastUpdatedDate":"2009-08-11T23:40:02"},
                            {"@array":"true","@id":"11111","@uri":"xyz/v1/Communications/11111","household": {"@id":"1111","@uri":"xyz/v1/Households/1111"},
                            "person":{"@id":"244404","@uri":"xyz/v1/People/1111"},
                            "communicationType":{"@id":"3","@uri":"xyz/v1/Communications/CommunicationTypes/3","name":"Mobile"},
                            "communicationGeneralType":"Telephone","communicationValue":"22222","searchCommunicationValue":"5475454","listed":"true",
                                "communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:40:02"},
                            {"@array":"true","@id":"15454","@uri":"xyz/v1/Communications/111111","household":{"@id":"14436295","@uri":"xyz/v1/Households/1111"},
                            "person":{"@id":"244444474","@uri":"xyz/v1/People/111111"},
                            "communicationType":{"@id":"4","@uri":"xyz/v1/Communications/CommunicationTypes/4","name":"Email"},
                            "communicationGeneralType":"Email","communicationValue":"email@needthis.com","searchCommunicationValue":"email@needthis.com","listed":"true",
                            "communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:39:06"}
                         ]
                       }
                      }';


    $json_decoded = json_decode($json_object);
    echo "email: ".$json_decoded->communications->communication[3]->communicationValue."<br />";

【讨论】：

这太棒了！它完美地完成了这项工作。谢谢！

【解决方案3】：

您可以使用json_decode()。你的示例字符串让我现在想起来有点复杂，但作为我自己的一个例子：

$json = '{"a":"apples","b":["bananas","boysenberries"],"c":"carrots"}';

$arr = json_decode($json);
echo $arr['a']; // "apples"
echo $arr['b'][0]; // "bananas"

【讨论】：

是的，这就是我想要的，但我不知道具体细节？非常感谢任何帮助。
电子邮件地址的数组名称和密钥是什么？
使用var_dump 或print_r 打印输出并查看那里

【解决方案4】：

<?php
$string = '{"communications":{"communication":[{"@array":"true","@id":"23101384","@uri":"xyz/v1/Communications/1111","household":{"@id":"111111","@uri":"xyz/v1/Households/5465465"},"person":{"@id":"","@uri":""},"communicationType":{"@id":"1","@uri":"xyz/v1/Communications/CommunicationTypes/1","name":"Home Phone"},"communicationGeneralType":"Telephone","communicationValue":"1111","searchCommunicationValue":"2693240758","listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:40:02"},{"@array":"true","@id":"11111","@uri":"xyz/v1/Communications/111111111","household":{"@id":"14436295","@uri":"xyz/v1/Households/11111"},"person":{"@id":"2222222","@uri":"xyz/v1/People/22222222"},"communicationType":{"@id":"2","@uri":"xyz/v1/Communications/CommunicationTypes/2","name":"Work Phone"},"communicationGeneralType":"Telephone","communicationValue":"11111","searchCommunicationValue":"789787987","listed":"false","communicationComment":null,"createdDate":"2009-08-09T15:49:27","lastUpdatedDate":"2009-08-11T23:40:02"},{"@array":"true","@id":"11111","@uri":"xyz/v1/Communications/11111","household":{"@id":"1111","@uri":"xyz/v1/Households/1111"},"person":{"@id":"244404","@uri":"xyz/v1/People/1111"},"communicationType":{"@id":"3","@uri":"xyz/v1/Communications/CommunicationTypes/3","name":"Mobile"},"communicationGeneralType":"Telephone","communicationValue":"22222","searchCommunicationValue":"5475454","listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:40:02"},{"@array":"true","@id":"15454","@uri":"xyz/v1/Communications/111111","household":{"@id":"14436295","@uri":"xyz/v1/Households/1111"},"person":{"@id":"244444474","@uri":"xyz/v1/People/111111"},"communicationType":{"@id":"4","@uri":"xyz/v1/Communications/CommunicationTypes/4","name":"Email"},"communicationGeneralType":"Email","communicationValue":"email@needthis.com","searchCommunicationValue":"email@needthis.com","listed":"true","communicationComment":null,"createdDate":"2008-11-10T12:31:26","lastUpdatedDate":"2009-08-11T23:39:06"}]}}';

$encoded = json_decode($string, JSON_FORCE_OBJECT);

echo $encoded['communications']['communication'][3]['communicationValue'];

echo "\n";

echo $encoded['communications']['communication'][3]['searchCommunicationValue'];

?>

但如果communicationValue 或searchCommunicationValue 超出communication 的索引3，你就有麻烦了。您可能需要循环 communication 并在其键/值上搜索这些字符串。

【讨论】：

【解决方案5】：

我写的很好的例子

在函数中传递 json_object 和 1，您将看到所有结构的值。

function decodejson($value,$num){
    if (count($value,0) > 0 && is_array($value)){
        foreach ($value as $key =>$tvalue){
            if (is_array($tvalue)){
                //echo $key."-<br />";
                $num++;
                decodejson($tvalue,$num);
            }else
                echo str_repeat("&nbsp;", $num).$key."->".$tvalue."<br />";
        }
    }else
        echo str_repeat("&nbsp;", $num).$key."->".$value."<br />";
}

【讨论】：