php数组（数组）到javascript

Question

我有一个包含 GPS 坐标的 MySQL 数据库。 这是我检索坐标的部分 PHP 代码；

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

现在我需要将返回的 PHP 数组“转换”为 javascript 中的数组数组。这个我已经试过了；

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

但这不是我们想要的输出

电流输出：

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"}];

期望的输出：

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

如何做到这一点？

Answer 1

你可以使用.map，像这样

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

试试

$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]);
}

还有

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