使用json從數據庫中獲取數據而不使用數組

Question

我想使用PHP和MySql在JSON中從數據庫中檢索對象。我只想知道如何做到這一點，而不必創建一個數組？可以做到嗎？

如果是這樣，我可以通過這個草稿代碼得到一個例子嗎？

$sql = "SELECT Email , FirstName, LastName,Contact FROM tblUser where UserID=sessionID"; 
$result = mysqli_query($conn,$sql); 

while($row = mysqli_fetch_array ($result)) { 
    $arr = array(
     $row["Email"], 
     $row["FirstName"], 
     $row["LastName"], 
     $row["Contact"] 
    ); 

    array_push($json, $arr); 
} 

$jsonstring = json_encode($json); 
echo $jsonstring; 

Answer 1

$sql = "select name,email from contact"; 

$res = mysqli_query($conn,$sql) or die(mysqli_error($conn)); 
$num = mysqli_num_rows($res); 

$json = array(); 
if($num > 0) 
{ 
    while ($obj=mysqli_fetch_object($res)) 
    { 
     $json[] = $obj; 
    } 
} 
echo json_encode($json); 

輸出：

[{"name":"test","email":"test@gmail.cmom"},{"name":"test1","email":"test1@gmail.cmom"}]