Checking if a property exists, if not - return null

Hello all,

I'm currently fetching tracks from SoundCloud's API and storing some details in my database.

Sometimes, a track is not available for download - therefore when attempting to access a property from the response, it will throw an error regarding an undefined property.

In this case, the download_url.

Here's my code;

$soundcloud = new SoundCloud(
    getenv('SC_CLIENT_ID'),
    getenv('SC_CLIENT_SECRET')
);

$tracks = json_decode($soundcloud->get('/users/{myUserId}/favorites')->request()->bodyRaw());

foreach($tracks as $track) {

    $artist = Artist::create([
        'sc_id'         => $track->user->id,
        'name'          => $track->user->username,
        'permalink_url' => $track->user->permalink_url,
        'avatar_url'    => $track->user->avatar_url
    ]);

    Track::create([
        'sc_id'         => $track->id,
        'artist_id'     => $artist->id,
        'title'         => $track->title,
        'duration'      => $track->duration,
        'stream_url'    => $track->stream_url,
        'waveform_url'  => $track->waveform_url,
        'download_url'  => $track->download_url, // Here is my problem
        'permalink_url' => $track->permalink_url,
        'artwork_url'   => $track->artwork_url
    ]);

}

Without writing an if statement and duplicating my code, I was wondering if it was possible to check if this property exists on the fly? If it doesn't return null

I originally attempting something like this;

'download_url' => $track->download_url ?: null,

But that doesn't work.

Any help would be greatly appreciated.