php中json_decode返回數組或對象的執行個體

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1.json_decode()

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

json_decode — 對 JSON 格式的字串進行編碼

說明
mixed json_decode ( string $json [, bool $assoc ] )
接受一個 JSON 格式的字串並且把它轉換為 PHP 變數

參數

json
待解碼的 json string 格式的字串。

assoc
當該參數為 TRUE 時,將返回 array 而非 object 。


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

範例

Example #1 json_decode() 的例子

 代碼如下 複製代碼

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

上例將輸出:

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);

結果為:

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] => ) )

可以看出經過json_decode()編譯出來的是對象,現在輸出json_decode($data,true)試下

 代碼如下 複製代碼

echo json_decode($data,true);

結果:

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($data,true)輸出的一個關聯陣列,由此可知json_decode($data)輸出的是對象,而json_decode("$arr",true)是把它強制產生PHP關聯陣列.


假如我們擷取的JSON資料如下:(可以使用curl、fsockopen等方式擷取)

 代碼如下 複製代碼

{
 "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函數返回array的方式得到:

 代碼如下 複製代碼

Array
(
    [from] => zh
    [to] => en
    [trans_result] => Array
        (
            [0] => Array
                (
                    [src] => 你好
                    [dst] => Hello
                )

        )

)

我們在PHP語言中可以用以下方法取得我們想要的值:

 代碼如下 複製代碼

<?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函數返回object的方式得到:

 代碼如下 複製代碼

stdClass Object
(
    [from] => zh
    [to] => en
    [trans_result] => Array
        (
            [0] => stdClass Object
                (
                    [src] => 你好
                    [dst] => Hello
                )

        )

)

我們在PHP語言中可以用以下方法取得我們想要的值:

 代碼如下 複製代碼

<?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
?>

 

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