Php to json nasıl yapabilirim?

<?php

require "simple_html_dom.php";

$html = str_get_html(html_entity_decode(file_get_contents('https://namazvakitleri.diyanet.gov.tr/tr-TR/9541/istanbul-icin-namaz-vakti'), ENT_HTML5, 'UTF-8'));

$data = array();

foreach($html->find('div[data-vakit-name]') as $salads)
{
    $salad = mb_strtolower($salads->find('div[class=tpt-title]', 0)->plaintext, 'UTF-8');
    $time = $salads->find('div[class=tpt-time]', 0)->plaintext;

    $data[$salad] = $time;
}

header('Content-Type: application/json; charset=utf-8');

echo json_encode($data, JSON_UNESCAPED_UNICODE);

?>