<?php
$test = '{"FullName":"1234567","UserName":"test2"}';//测试数据成功
$test_json = json_decode($test);
error_log("test_json->FullName = ". $test_json->FullName);
//接受android post 请求的类似json格式的字符串数据（{"FullName":"1234567","UserName":"test2"}）
$obj = file_get_contents("php://input");
error_log(" obj1 == ".$obj);
$obj = "'".$obj ."'";
error_log(" obj2 == ".$obj);
$json = json_decode($obj);
//如果$obj不加单引号，则报类型转换异常，加了单引号之后json_decode($obj)，又没有数据输出
//$obj = {"FullName":"1234567","UserName":"test2"};
//<b>Catchable fatal error</b>: Object of class stdClass could not be converted to string in <b>D:\Web\www\book\AppCart.php</b> on line <b>21</b><br />
// 用json_encode也不能$json->UserName输出数据
// $json = json_encode($obj);
// "{\\"FullName\\":\\"1234567\\",\\"UserName\\":\\"test2\\"}"
error_log(" json== " . $json);
$username = $json->UserName;
$fullname = $json->FullName;
error_log("+++++UserName++++" . $username);
error_log("++++++fullname==++++" . $fullname);
?>
以上是全部代码，为什么接受android post 请求的过来的json格式的字符串，获取不到数据，以下是输出日志：
[Mon Oct 20 21:36:10 2014] [error] [client 192.168.1.109] test_json->FullName = 1234567
[Mon Oct 20 21:36:10 2014] [error] [client 192.168.1.109] obj1 == {"FullName":"1234567","UserName":"test2"}
[Mon Oct 20 21:36:10 2014] [error] [client 192.168.1.109] obj2 == '{"FullName":"1234567","UserName":"test2"}'
[Mon Oct 20 21:36:10 2014] [error] [client 192.168.1.109] json==
[Mon Oct 20 21:36:10 2014] [error] [client 192.168.1.109] +++++UserName++++
[Mon Oct 20 21:36:10 2014] [error] [client 192.168.1.109] ++++++fullname==++++
