field.php

<?php
session_start();
require_once 'config.php';
mysqli_set_charset($mysqli, "utf8");

if ($_SESSION['login']==1) {

    $id_user = $_SESSION['id'];
    $id = $_GET['id'];
    $id = $mysqli->real_escape_string($id);

    $json = array();
                
    $re = mysqli_query($mysqli, "SELECT field_settings.id, field.id AS fid, field_settings.name, field.value, unit.symbol FROM field_settings LEFT JOIN field ON field_settings.id = field.field AND field.entry='$id' JOIN unit ON field_settings.unit = unit.id  WHERE field_settings.user='$id_user' ");
    while($row = mysqli_fetch_array($re))
    {      
        $bus = array (
            "id" => $row['id'],
            "fid" => $row['fid'],
            "name" => $row['name'],
            "value" => $row['value'],
            "symbol" => $row['symbol']
        );
        array_push($json, $bus);
    }

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

}
else {
    header('Location: http://'.$host.'/login.php');
}

?>