php - 未显示从 MySQL 到 JSON 数据的 Highchart 数据

Question

$sql = "SELECT * FROM `demo_viewer` WHERE 1 ";

$viewer = mysqli_query($mysqli,$sql);

$view = array();

while ($row = mysqli_fetch_array($viewer)){

    $view[] = $row;
}

$viewer = json_encode($view,JSON_NUMERIC_CHECK);

为什么这段代码没有显示数据... 数据库连接正常，但是如果像下面这样的代码显示此数据..

$sql = "SELECT SUM(numberofview) as count FROM demo_viewer 

        GROUP BY YEAR(created_at) ORDER BY created_at";

$viewer = mysqli_query($mysqli,$sql);

$viewer = mysqli_fetch_all($viewer,MYSQLI_ASSOC);

$viewer = json_encode(array_column($viewer, 'count'),JSON_NUMERIC_CHECK);

Answer 1

试试这个，

mysqli_query($mysqli,'SET NAMES utf8mb4');

$sql = "SELECT * FROM `demo_viewer` WHERE 1 ";

$viewer = mysqli_query($mysqli,$sql);

$view = array();

while ($row = mysqli_fetch_array($viewer,MYSQLI_ASSOC)){

    $view[] = $row;
}

$viewer = json_encode($view, JSON_PARTIAL_OUTPUT_ON_ERROR | JSON_FORCE_OBJECT | JSON_NUMERIC_CHECK);

编辑

mysqli_query($mysqli,'SET NAMES utf8mb4');

$sql = "SELECT numberofclick FROM `demo_viewer` GROUP BY YEAR(created_at) ORDER BY created_at ";

$viewer = mysqli_query($mysqli,$sql);

$view = array();

while ($row = mysqli_fetch_array($viewer,MYSQLI_ASSOC)){

    $view[] = $row['numberofclick'];
}

$viewer = json_encode($view, JSON_PARTIAL_OUTPUT_ON_ERROR | JSON_FORCE_OBJECT | JSON_NUMERIC_CHECK);

PS:你不应该使用 select * from table。因为 Highchart 需要一列值。不是所有的列。