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php中json_decode返回数组或对象的实例

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Release: 2016-06-08 17:22:48
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PHP5.2.0及以上版本具有json_decode函数,该函数是用来解析JSON格式的数据,可以返回array(数组)或object(对象)两种结果,下面将分两种情况具体介绍json_decode的用法以及如何取得我们想要的值。

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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

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($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)
}


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

$data = {
 "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($jsondata);www.111cn.net
echo "
".$jsondata['to']; //en
echo "
".$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

$data = {
 "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($jsondata);
echo "
".$jsondata->from; //zh
echo "
".$jsondata->trans_result[0]->src; //你好
?>

 

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