• php中json_decode返回数组或对象的实例


    1.json_decode()

    json_decode
    (PHP 5 >= 5.2.0, PECL json >= 1.2.0)

    json_decode — 对 JSON 格式的字符串进行编码

    说明
    mixed json_decode ( string $json [, bool $assoc ] )
    接受一个 JSON 格式的字符串并且把它转换为 PHP 变量

    参数

    json
    待解码的 json string 格式的字符串。

    assoc
    当该参数为 TRUE 时,将返回 array 而非 object 。


    返回值
    Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned.

    范例

    Example #1 json_decode() 的例子

     代码如下 复制代码
    <?php
    $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
    var_dump(json_decode($json));
    var_dump(json_decode($json, true));
    ?>

    上例将输出:

    object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
    }

    array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
    }http://www.111cn.net/phper/php-cy/57800.htm


    $data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]';
    echo json_decode($data);

    结果为:

    Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )
     

    可以看出经过json_decode()编译出来的是对象,现在输出json_decode($data,true)试下

     代码如下 复制代码
    echo json_decode($data,true);

    结果:

    Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )
     

    可以看出 json_decode($data,true)输出的一个关联数组,由此可知json_decode($data)输出的是对象,而json_decode("$arr",true)是把它强制生成PHP关联数组.


    假如我们获取的JSON数据如下:(可以使用curl、fsockopen等方式获取)

     代码如下 复制代码
    {
     "from":"zh",
     "to":"en",
     "trans_result":[
      {
       "src":"u4f60u597d",
       "dst":"Hello"
      }
     ]
    }
     

    一、json_decode返回array的方式:

    json_decode($data,true);用json_decode函数返回array的方式得到:

     代码如下 复制代码
    Array
    (
        [from] => zh
        [to] => en
        [trans_result] => Array
            (
                [0] => Array
                    (
                        [src] => 你好
                        [dst] => Hello
                    )

            )

    )
     

    我们在PHP语言中可以用以下方法取得我们想要的值:

     代码如下 复制代码
    <?php
    $data = <<<STR
    {
     "from":"zh",
     "to":"en",
     "trans_result":[
      {
       "src":"u4f60u597d",
       "dst":"Hello"
      }
     ]
    }
    STR;
    $jsondata=json_decode($data,true);
    header("Content-Type: text/html; charset=UTF-8");
    print_r($jsondata);www.111cn.net
    echo "<br />".$jsondata['to']; //en
    echo "<br />".$jsondata['trans_result'][0]['dst']; //Hello
    ?>
     

    二、json_decode返回object的方式:

    json_decode($data);

    用json_decode函数返回object的方式得到:

     代码如下 复制代码
    stdClass Object
    (
        [from] => zh
        [to] => en
        [trans_result] => Array
            (
                [0] => stdClass Object
                    (
                        [src] => 你好
                        [dst] => Hello
                    )

            )

    )
     

    我们在PHP语言中可以用以下方法取得我们想要的值:

     代码如下 复制代码
    <?php
    $data = <<<STR
    {
     "from":"zh",
     "to":"en",
     "trans_result":[
      {
       "src":"u4f60u597d",
       "dst":"Hello"
      }
     ]
    }

    STR;
    $jsondata=json_decode($data);
    header("Content-Type: text/html; charset=UTF-8");
    print_r($jsondata);
    echo "<br />".$jsondata->from; //zh
    echo "<br />".$jsondata->trans_result[0]->src; //你好
    ?>
     

    更多详细内容请查看:http://www.111cn.net/phper/php-cy/57800.htm

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  • 原文地址:https://www.cnblogs.com/alibai/p/3547485.html
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