<?php
include('includes/config/config.php');
include('log_entry.php');

$query = "select param_name from history_parameter";
if (!$result = @mysqli_query($conn, $query)) {
    exit(mysqli_error($conn));
}
$data = array();
if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        $data[] = $row['param_name'];
    }
} else {
    $data['status'] = 200;
    $data['message'] = "Data not found!";
}
error_log("data ".print_r($data,true));
echo json_encode($data);