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php中json_decode傳回數組或對象

http://www.3lian.com/edu/2014/02-11/128395.html

   1.json_decode()

  json_decode

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

  json_decode — 對 JSON 格式的字元串進行編碼

  說明

  mixed json_decode ( string $json [, bool $assoc ] )

  接受一個 JSON 格式的字元串并且把它轉換為 PHP 變量

  參數

  json

  待解碼的 json string 格式的字元串。

  assoc

  當該參數為 TRUE 時,将傳回 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

<?php 

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

var_dump(json_decode($json)); 

var_dump(json_decode($json, true)); 

?>

上例将輸出:

object(stdClass)#1 (5) { 

["a"] => int(1) 

["b"] => int(2) 

["c"] => int(3) 

["d"] => int(4) 

["e"] => int(5) 

}

array(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

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($data,true)輸出的一個關聯數組,由此可知json_decode($data)輸出的是對象,而json_decode("$arr",true)是把它強制生成PHP關聯數組.

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

{

 "from":"zh",

 "to":"en",

 "trans_result":[

  {

   "src":"u4f60u597d",

   "dst":"Hello"

  }

 ]

  一、json_decode傳回array的方式:

  json_decode($data,true);用json_decode函數傳回array的方式得到:

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:

<?php

$data = <<<STR

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傳回object的方式:

  json_decode($data);

  用json_decode函數傳回object的方式得到:

stdClass Object

            [0] => stdClass Object

$jsondata=json_decode($data);

print_r($jsondata);

echo "<br />".$jsondata->from; //zh

echo "<br />".$jsondata->trans_result[0]->src; //你好