<?php
header('Content-Type: application/json ');
$servername = "localhost";
$username = "root";
$password = "root";
$database = "base";

$conn = new mysqli($servername, $username, $password, $database);
if ($conn->connect_error) {
    die("Ошибка соединения: " . $conn->connect_error);
}
$massiv = array();
$id = isset($_GET['id']) ? $_GET['id'] : '';

$sql = "SELECT * FROM express where id between ($id+1) and ($id+20)  ";

$stmt = $conn->prepare($sql); $stmt->execute();

$stmt->bind_result($id, $type, $added, $start, $finish, $kapper, $kf, $opisanie);
while($stmt->fetch()){

    $temp = [
        'id'=>+$id,
        'type'=>$type,
        'added'=>$added,
        'start'=>$start,
        'finish'=>$finish,
        'kapper'=>$kapper,
        'kf'=>$kf,
        'opisanie'=>$opisanie
    ];

    array_push($massiv, $temp);
}
echo json_encode($massiv);
?>