将数组和输出中的数据组合为JSON

Question

I'm fetching some data from a website and output them in JSON. Retrieving the data is now successful, but unfortunately I am unable to sort the times and cars by date. Maybe someone can me help to get on the right track here.

    <li class="day">
    <span class="dayText">Maandag 1 juli</span>
    <ul>
        <li class="details" detailid="142">
            <div class="info">
                <span class="time">12:15</span>
            </div>
            <div class="car">
                <span class="car">
                    <a href="https://url.url">Opel Astra</a>
                </span>
            </div>
        </li>
        <li class="details" detailid="143">
            <div class="info">
                <span class="time">14:45 uur</span>
            </div>
            <div class="car">
                <span class="car">
                    <a href="https://url.url">Opel Ascona</a>
                </span>
            </div>
        </li>
    </ul>
</li>
<li class="day">
    <span class="dayText">Dinsdag 2 juli</span>
    <ul>
        <li class="details" detailid="144">
            <div class="info">
                <span class="time">03:15</span>
            </div>
            <div class="car">
                <span class="car">
                    <a href="https://url.url">Aston Martin Vanquish</a>
                </span>
            </div>
        </li>
        <li class="details" detailid="145">
            <div class="info">
                <span class="time">08:23 uur</span>
            </div>
            <div class="car">
                <span class="car">
                    <a href="https://url.url">Fiat Panda</a>
                </span>
            </div>
        </li>
    </ul>
</li>

Output wanted (JSON): The output should resemble this as much as it can. The hard thing is to have the two times match the date.

{
"date": "Maandag 1 juli" {
    "time": "12:15"
    "car": "Opel Astra"
    "time": "14:45"
    "car": "Opel Ascona"
}
"date": "Dinsdag 2 juli" {
    "time": "03:15"
    "car": "Aston Martin Vanquish"
    "time": "08:23"
    "car": "Fiat Panda"
}

PHP This is the PHP-code is have written this far. The output shows NULL. For some reason it can't be matched.

<?php
$html = file_get_contents('https://url.url');
preg_match_all("/\<span class\=\"dayText\"\>(.*?)\<\/span\>/", $html, $day);
preg_match_all("/\<span class\=\"time\"\>(.*?)\<\/span\>/", $html, $time);
preg_match_all("/\<span class\=\"car\"\>(.*?)\<\/span\>/", $html, $car);
$finalResult = array_combine($day[0],$time[0],$car[0]);
var_dump($finalResult);
?>