json_decode
(PHP 5 >= 5.2.0, PECL json >= 1.2.0)
json_decode — 对 JSON 格式的字符串进行编码
说明
mixed json_decode ( string $json [, bool $assoc ] )
接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
参数
json
待解码的 json string 格式的字符串。
assoc
当该参数为 TRUE 时,将返回 array 而非 object 。
返回值
Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned.
范例
Example #1 json_decode() 的例子
代码如下
1
$json = ‘{“a”:1,“b”:2,“c”:3,“d”:4,“e”:5}’;
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>
2 上例将输出:
3 object(stdClass)#1 (5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
4 array(5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
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);
6 结果为:
7 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] => ) )
可以看出经过json_decode()编译出来的是对象,现在输出json_decode($data,true)试下
代码如下
1 echo json_decode( d a t a , t r u e ) ; 2 结 果 : 3 A r r a y ( [ 0 ] = > A r r a y ( [ N a m e ] = > a 1 [ N u m b e r ] = > 123 [ C o n t n o ] = > 000 [ Q Q N o ] = > ) [ 1 ] = > A r r a y ( [ N a m e ] = > a 1 [ N u m b e r ] = > 123 [ C o n t n o ] = > 000 [ Q Q N o ] = > ) [ 2 ] = > A r r a y ( [ N a m e ] = > a 1 [ N u m b e r ] = > 123 [ C o n t n o ] = > 000 [ Q Q N o ] = > ) ) 可 以 看 出 j s o n d e c o d e ( data,true); 2 结果: 3 Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) ) 可以看出 json_decode( data,true);2结果:3Array([0]=>Array([Name]=>a1[Number]=>123[Contno]=>000[QQNo]=>)[1]=>Array([Name]=>a1[Number]=>123[Contno]=>000[QQNo]=>)[2]=>Array([Name]=>a1[Number]=>123[Contno]=>000[QQNo]=>))可以看出jsondecode(data,true)输出的一个关联数组,由此可知json_decode( d a t a ) 输 出 的 是 对 象 , 而 j s o n d e c o d e ( " data)输出的是对象,而json_decode(" data)输出的是对象,而jsondecode("arr",true)是把它强制生成PHP关联数组.
假如我们获取的JSON数据如下:(可以使用curl、fsockopen等方式获取)
代码如下
1 {
"from":"zh",
"to":"en",
"trans_result":[
{
"src":"u4f60u597d",
"dst":"Hello"
}
]
}
一、json_decode返回array的方式:
json_decode($data,true);用json_decode函数返回array的方式得到:
代码如下
1 Array
(
[from] => zh
[to] => en
[trans_result] => Array
(
[0] => Array
(
[src] => 你好
[dst] => Hello
)
2 )
3 )
我们在PHP语言中可以用以下方法取得我们想要的值:
代码如下
1
$data = <<
{
"from":"zh",
"to":"en",
"trans_result":[
{
"src":"u4f60u597d",
"dst":"Hello"
}
]
}
STR;
$jsondata=json_decode($data,true);
header("Content-Type: text/html; charset=UTF-8");
print_r($jsondata);www.111com.net
echo "
".$jsondata[‘to’]; //en
echo "
".$jsondata[‘trans_result’][0][‘dst’]; //Hello
?>
二、json_decode返回object的方式:
json_decode($data);
用json_decode函数返回object的方式得到:
代码如下
1 stdClass Object
(
[from] => zh
[to] => en
[trans_result] => Array
(
[0] => stdClass Object
(
[src] => 你好
[dst] => Hello
)
2 )
3 )
我们在PHP语言中可以用以下方法取得我们想要的值:
代码如下
1
$data = <<
{
"from":"zh",
"to":"en",
"trans_result":[
{
"src":"u4f60u597d",
"dst":"Hello"
}
]
}
2 STR;
$jsondata=json_decode($data);
header("Content-Type: text/html; charset=UTF-8");
print_r($jsondata);
echo "
".$jsondata->from; //zh
echo "
".$jsondata->trans_result[0]->src; //你好
?>