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) } $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:
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 ?>查看更多关于php中json_decode返回数组或对象的实例 - php数组的详细内容...
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