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php中JSON的使用方法_php技巧

WBOY
WBOYOriginal
2016-05-16 20:16:191089browse

从5.2版本开始,PHP原生提供json_encode()和json_decode()函数,前者用于编码,后者用于解码。
json_encode()                                                                      
该函数主要用来将数组和对象,转换为json格式。

复制代码 代码如下:

$arr = array ('a'=>'a','b'=>'b','c'='c','d'=>'d','e'='e');
echo json_encode($arr);

输出结果:
json只接受utf-8编码的字符,json_encode()的参数必须是utf-8编码。

class person 
{ 
  public $name; 
  public $age; 
  public $height; 
  function __construct($name,$age,$height) 
  { 
    $this->name = $name; 
    $this->age = $age; 
    $this->height = $height;   
  }  
} 
$obj = new person("zhangsan",20,100); 
$foo_json = json_encode($obj); 
echo $foo_json; 

输出结果:
当类中的属性为私有变量的时候,则不会输出。
json_decode()                                                                      
该函数用于将json文本转换为相应的PHP数据结构。

复制代码 代码如下:

$json = '{"a":"hello","b":"world","c":"zhangsan","d":20,"e":170}';
var_dump(json_decode($json));

输出结果:
通常情况下,json_decode()总是返回一个PHP对象。
转成数组的:

复制代码 代码如下:

$json = '{"a":"hello","b":"world","c":"zhangsan","d":20,"e":170}';
var_dump(json_decode($json,ture));

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