無法返回正確的JSON響應android

Question

我已經把PHP腳本放在服務器上。當我使用表單進行測試時，該腳本正常工作。我已經添加了php腳本位於我的android應用程序中的地址，現在，當我執行代碼時，它不會返回json數據，而是返回此值。

07-20 16:42:13.839: I/System.out(2048): displaying <!-- www.freewebhost.com Analytics 
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下面是PHP腳本：

<?php 

require("config.inc.php"); 

if (!empty($_POST)) { 

$query = " 
     SELECT 
      id, 
      username, 
      password 
     FROM userCredentials 
     WHERE 
      username = :username 
    "; 

$query_params = array(
    ':username' => $_POST['username'] 
); 

try { 
    $stmt = $db->prepare($query); 
    $result = $stmt->execute($query_params); 
} 
catch (PDOException $ex) { 


    $response["success"] = 0; 
    $response["message"] = "Database Error1. Please Try Again!"; 
    die(json_encode($response)); 

} 

$validated_info = false; 


$row = $stmt->fetch(); 
if ($row) { 

    if ($_POST['password'] === $row['password']) { 
     $login_ok = true; 
    } 
} 

if ($login_ok) { 
    $response["success"] = 1; 
    $response["message"] = "Login successful!"; 
    die(json_encode($response)); 

} else { 
    $response["success"] = 0; 
    $response["message"] = "Invalid Credentials!"; 

    die(json_encode($response)); 
} 
} 
?> 

的config.inc.php

<?php 

$host = "db.freewebhost.com"; 
$dbname = "hello";  
$username = "android"; 
$password = "12345"; 


$options = array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'); 

try 
{ 
    $db = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $username, $password, $options); 
} 
catch(PDOException $ex) 
{ 
    die("Failed to connect to the database: " . $ex->getMessage()); 
} 

$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); 

if(function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc()) 
{ 
    function undo_magic_quotes_gpc(&$array) 
    { 
     foreach($array as &$value) 
     { 
      if(is_array($value)) 
      { 
       undo_magic_quotes_gpc($value); 
      } 
      else 
      { 
       $value = stripslashes($value); 
      } 
     } 
    } 

    undo_magic_quotes_gpc($_POST); 
    undo_magic_quotes_gpc($_GET); 
    undo_magic_quotes_gpc($_COOKIE); 
} 

header('Content-Type: text/html; charset=utf-8'); 


session_start(); 

?> 

爲什麼這個腳本不返回JSON數據？請幫我解決這個問題。我沒有PHP的經驗。

Regards

Answer 1

標題內容類型應該是text/json。在confing.inc.php中，將其設置爲text/html：

header('Content-Type: text/html; charset=utf-8');