php array（的數組）到javascript

Question

我有一個包含GPS座標的MySQL數據庫。 這是我的部分PHP代碼來檢索座標;

$sql = "SELECT lat, lon FROM gps_data"; 
$stmt=$db->query($sql); 
$result=$stmt->fetchAll(); 

現在我需要將返回的PHP數組「轉換」爲JavaScript中數組的數組。我已經試過了;

var js_var = <?php echo json_encode($result); ?>; 

但它不期望的輸出

電流輸出：

var js_var = [{"lat":"61.883350","0":"61.883350","lon":"8.551115","1":"8.551115"},{"lat":"61.883380","0":"61.883350","lon":"8.551715","1":"8.551715"}]; 

所需的輸出：

var js_var = 
[[61.883350,8.551115],[61.883380,8.551715]]; 

如何實現這一目標？

Answer 1

您可以使用.map，像這樣

var js_var = [{"lat":"61.883350","0":"61.883350","lon":"8.551115","1":"8.551115"},{"lat":"61.883380","0":"61.883350","lon":"8.551715","1":"8.551715"}]; 
 

 
var result = js_var.map(function (el) { 
 
    return [el.lat, el.lon]; 
 
}); 
 

 
console.log(result);

Answer 2

嘗試

$sql = "SELECT lat, lon FROM gps_data"; 
$stmt=$db->query($sql); 
$result=$stmt->fetchAll(); 
$final=array(); 
foreach($result as $row) { 
    $final[]=array($row[0],$row[1]); 
} 

而且

var js_var = <?php echo json_encode($final); ?>;