知识点：

1、JSON数据格式介绍

2、对数据编码成JSON格式

3、对JSON数据进行解码，并操作

JSON数据格式表示方式如下：

{ "programmers": [

{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },

{ "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" },

{ "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }

],

"authors": [

{ "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" },

{ "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" },

{ "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }

],

"musicians": [

{ "firstName": "Eric", "lastName": "Clapton", "instrument": "guitar" },

{ "firstName": "Sergei", "lastName": "Rachmaninoff", "instrument": "piano" }

] }

用php将数据编码成JSON格式：

//php中用数组表示JSON格式数据$arr = array(

'firstname' => iconv('gb2312', 'utf-8', '非诚'),

'lastname' => iconv('gb2312', 'utf-8', '勿扰'),

'contact' => array(

'email' =>'fcwr@dibaye.com',

'website' =>'http://www.dibaye.com',

)

);

//将数组编码成JSON数据格式$json_string = json_encode($arr);

//JSON格式数据可直接输出echo $json_string;

?>

需要指出的是，在非UTF-8编码下，中文字符将不可被encode，结果会出来空值，所以，如果你使用 gb2312编写PHP代码，那么就需要将包含中文的内容使用iconv或者mb转为UTF-8再进行json_encode。

输出：(JSON格式)

{"firstname":"\u975e\u8bda","lastname":"\u52ff\u6270","contact":{"email":"fcwr@dibaye.com","website":"http:\/\/www.dibaye.com"}}

用php对JSON数据进行解码并处理：

//php中用数组表示JSON格式数据$arr = array(

'firstname' => iconv('gb2312', 'utf-8', '非诚'),

'lastname' => iconv('gb2312', 'utf-8', '勿扰'),

'contact' => array(

'email' =>'fcwr@dibaye.com',

'website' =>'http://www.dibaye.com',

)

);

//将数组编码成JSON数据格式$json_string = json_encode($arr);

//将JSON格式数据进行解码，解码后不是JSON数据格式，不可用echo直接输出$obj = json_decode($json_string);

//强制转化为数组格式$arr = (array) $obj;

//按数组方式调用里面的数据echo iconv('utf-8','gb2312',$arr['firstname']);

echo '';

//输出数组结构print_r($arr);

?>

输出：

非诚

Array ( [firstname] => 闈炶瘹 [lastname] => 鍕挎壈 [contact] => stdClass Object ( [email] => fcwr@dibaye.com [website] => http://www.dibaye.com ) )