打印此查询输出以json格式在php webservices中使用

Question

我已经在php文件中编写了这个查询来从数据库中获取数据，它工作正常并获得所需的数据。 但是如何在json fromat中打印检索到的数据以使用Web服务

$query  = "SELECT * ";
$query .= "FROM subjects ";
$query .= "WHERE visible = 1 ";
$query .= "ORDER BY position ASC";
$result = mysqli_query($connection, $query);
   $subject = mysqli_fetch_assoc($result);
 print_r($subject);

必须要做什么代码才能帮助我。

Answer 1

你试过json_encode吗？像：

$query  = "SELECT * ";
$query .= "FROM subjects ";
$query .= "WHERE visible = 1 ";
$query .= "ORDER BY position ASC";
$result = mysqli_query($connection, $query);
$subject = mysqli_fetch_assoc($result);

echo json_encode($subject);

有关详细信息，请查看：PHP Manual

Answer 2

试试这个：

$query  = "SELECT * ";
$query .= "FROM subjects ";
$query .= "WHERE visible = 1 ";
$query .= "ORDER BY position ASC";
$result = mysqli_query($connection, $query);
$subject = mysqli_fetch_assoc($result);

header('Content-Type: application/json');
echo json_encode($subject);