PHP 中操作JSON的一些笔记。
简介
JSON(JavaScript Object Notation)最初是javascript对象的一种格式，后来越来越多的的高级语言也支持这种格式，PHP也不例外。
php数据转化成JSON
其实非常简单，只要json_encode()函数就可以实现，具体代码如下
1、php数组转化为Json
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| $concerts_array = array(
array("product" => "book", "price" => 23.1, "num" => 3),
array("product" => "food", "price" => 32.87, "num" => 2),
array("product" => "computer", "price" => 6534, "num" => 1)
);
echo json_encode($concerts_array);
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然后在浏览器里显示如下
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| [{"product":"book","price":23.1,"num":3},{"product":"food","price":32.87,"num":2},{"product":"computer","price":6534,"num":1}]
|
2、php对象转化为Json
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| $concerts_class = new stdclass();
$concerts_class->book = new stdclass();
$concerts_class->book->price = 23.1;
$concerts_class->book->num = 3;
$concerts_class->food = new stdclass();
$concerts_class->food->price = 32.87;
$concerts_class->food->num = 2;
$concerts_class->computer = new stdclass();
$concerts_class->computer->price = 6534;
$concerts_class->computer->num = 1;
echo json_encode($concerts_class);
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首先看下$concerts_class这个对象的结构
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| object(stdClass)
["book"]=>
object(stdClass)
["price"]=>
float(23.1)
["num"]=>
int(3)
}
["food"]=>
object(stdClass)
["price"]=>
float(32.87)
["num"]=>
int(2)
}
["computer"]=>
object(stdClass)
["price"]=>
int(6534)
["num"]=>
int(1)
}
}
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转化后的Json数据为
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| {"book":{"price":23.1,"num":3},"food":{"price":32.87,"num":2},"computer":{"price":6534,"num":1}}
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Json格式数据转化成php可操作数据类型
这一步也是一个json_decode()函数就可以搞定的事情，其中第二的参数是一个开关，默认为false，可就是默认转化为object，当传入true时，就是转化为array类型。
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| $json_array = '[{"product":"book","price":23.1,"num":3},{"product":"food","price":32.87,"num":2},{"product":"computer","price":6534,"num":1}]';
$content_class = json_decode($json_array, true);
$content_array = json_decode($json_array, false);
var_dump($content_array);
var_dump($content_class);
echo "\n===============================（看毛看，没看过昏割线嘛）=======================================\n";
$json_class = '{"book":{"price":23.1,"num":3},"food":{"price":32.87,"num":2},"computer":{"price":6534,"num":1}}';
$content_class = json_decode($json_class, true);
$content_array = json_decode($json_class, false);
var_dump($content_array);
var_dump($content_class);
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然后浏览器里显示对应如下
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| array(3) {
[0]=>
object(stdClass)
["product"]=>
string(4) "book"
["price"]=>
float(23.1)
["num"]=>
int(3)
}
[1]=>
object(stdClass)
["product"]=>
string(4) "food"
["price"]=>
float(32.87)
["num"]=>
int(2)
}
[2]=>
object(stdClass)
["product"]=>
string(8) "computer"
["price"]=>
int(6534)
["num"]=>
int(1)
}
}
array(3) {
[0]=>
array(3) {
["product"]=>
string(4) "book"
["price"]=>
float(23.1)
["num"]=>
int(3)
}
[1]=>
array(3) {
["product"]=>
string(4) "food"
["price"]=>
float(32.87)
["num"]=>
int(2)
}
[2]=>
array(3) {
["product"]=>
string(8) "computer"
["price"]=>
int(6534)
["num"]=>
int(1)
}
}
===============================（看毛看，没看过昏割线嘛）=======================================
object(stdClass)
["book"]=>
object(stdClass)
["price"]=>
float(23.1)
["num"]=>
int(3)
}
["food"]=>
object(stdClass)
["price"]=>
float(32.87)
["num"]=>
int(2)
}
["computer"]=>
object(stdClass)
["price"]=>
int(6534)
["num"]=>
int(1)
}
}
array(3) {
["book"]=>
array(2) {
["price"]=>
float(23.1)
["num"]=>
int(3)
}
["food"]=>
array(2) {
["price"]=>
float(32.87)
["num"]=>
int(2)
}
["computer"]=>
array(2) {
["price"]=>
int(6534)
["num"]=>
int(1)
}
}
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The End~