php中json_decode返回数组或对象的实例
PHP5.2.0及以上版本具有json_decode函数,该函数是用来解析JSON格式的数据,可以返回array(数组)或object(对象)两种结果,,下面将分两种情况具体介绍json_decode的用法以及如何取得我们想要的值.
1.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.
范例代码如下:
<?php $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}'; var_dump(json_decode($json)); var_dump(json_decode($json, true)); ?>
//上例将输出:
object(stdClass)#1 (5) { ["a"] => int(1) ["b"] => int(2) ["c"] => int(3) ["d"] => int(4) ["e"] => int(5) } array(5) { ["a"] => int(1) ["b"] => int(2) ["c"] => int(3) ["d"] => int(4) ["e"] => int(5) }
<?php $data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]'; echo json_decode($data); ?>
//结果为:
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($data,true)试下,代码如下:
<?php echo json_decode($data,true); ?>
//结果:
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($data,true)试下,代码如下:
echo json_decode($data,true); //结果: 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($data,true)输出的一个关联数组,由此可知json_decode($data)输出的是对象,而json_decode("$arr",true)是把它强制生成PHP关联数组.
假如我们获取的JSON数据如下:(可以使用curl、fsockopen等方式获取),代码如下:
{ "from":"zh", "to":"en", "trans_result":[ { "src":"u4f60u597d", "dst":"Hello" } ] }
一、json_decode返回array的方式:
json_decode($data,true);用json_decode函数返回array的方式得到:
Array ( [from] => zh [to] => en [trans_result] => Array ( [0] => Array ( [src] => 你好 [dst] => Hello ) ) )
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:
<?php $data = <<<STR { "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($jsondata); echo "<br />".$jsondata['to']; //en echo "<br />".$jsondata['trans_result'][0]['dst']; //Hello
二、json_decode返回object的方式:
json_decode($data);
用json_decode函数返回object的方式得到:
stdClass Object ( [from] => zh [to] => en [trans_result] => Array ( [0] => stdClass Object ( [src] => 你好 [dst] => Hello ) ) )
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:
<?php $data = <<<STR { "from":"zh", "to":"en", "trans_result":[ { "src":"u4f60u597d", "dst":"Hello" } ] } STR; $jsondata=json_decode($data); header("Content-Type: text/html; charset=UTF-8"); print_r($jsondata); echo "<br />".$jsondata->from; //zh echo "<br />".$jsondata->trans_result[0]->src; //你好
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