php后端实现与Android进行json交互

	JSONObject jsonObject   = new JSONObject(builder.toString());

	JSONObject jo = new JSONObject();

        jo.put("name", "test");

 
params.add(new BasicNameValuePair("userJson",jo.toString() ));

<?php  
    	$json_string = $_POST ["userJson"];  
	$user = json_decode($json_string,true);//这里的true加上就会将android发来的json字符串转化为关联数组

  	$arr = array(  
        'user_id' => $user["name"]
        );  
	$str = json_encode($arr);  
    	echo($str);  
?>

<?php  
    	$json_string = $_POST ["userJson"];  
	$user = json_decode($json_string,true);//这里的true加上就会将android发来的json字符串转化为关联数组
  	$arr = array(  
        'user_id' => $user[0]["name"]
        );  
	$str = json_encode($arr);  
    	echo($str);  
?>

array(1){	["name"]=>String("test")	}

array(2){
	[0]=>array(1){			["name"]=>String("lala")			}	[1]=>array(0){}
	}

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