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JSON

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:
复制代码 代码如下:
{ "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:
复制代码 代码如下:
//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@bitsCN.com',
'website' =>'http://www.bitsCN.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@bitsCN.com","website":"http:\/\/www.bitsCN.com"}}
用php对JSON数据进行解码并处理:
复制代码 代码如下:
//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@bitsCN.com',
'website' =>'http://www.bitsCN.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@bitsCN.com [website] => http://www.bitsCN.com ) )
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