Hide echo output, when text file is empty - php

Question

I have a blog/vlog where I also share my listening habits from Spotify live.
I use a little snippet called Snip (available on Github) that fetches my Spotify stream, creates text files for my data (like track, artist, album and trackID)
Now I wanted to add a link on my webpage to the actual track I am playing using the variable $i for trackID
I've come up with this code thanks to some googling and tips/trix pages:
<?php
$myfile = fopen("Snip_TrackId.txt", "r") or die("Die!");
echo "<a href='https://open.spotify.com/track/";
echo fread($myfile,filesize("Snip_TrackId.txt"));
echo "'target='_blank'><img width='18px' height='18px' title='Open with Spotify' src='np_spotify.png'><a/> <- Listen";
fclose($myfile);
?>
This works just fine, but when I close down Spotify or pause, the text files empty themselves and my info box turns blank AND THAT'S THE WAY IT SHOULD BE :).
B
ut...... With my code above, the link, image and text "<- Listen" is still visible and I've been trying to figure out how I can fix this but I'm stuck.
(The link is also not really working as it only points to the part without the trackID)
So now I turn to you. Can you help me with a working solution for this?
If not, I will probably just keep things as they are.

Answer 1

you can just check the filesize before reading it:
<?php
if ((int)filesize("Snip_TrackId.txt") > 0)
{
$myfile = fopen("Snip_TrackId.txt", "r") or die("Die!");
echo "<a href='https://open.spotify.com/track/";
echo fread($myfile, filesize("Snip_TrackId.txt"));
echo "'target='_blank'><img width='18px' height='18px' title='Open with Spotify' src='np_spotify.png'><a/> <- Listen";
fclose($myfile);
}

Answer 2

Before writing a link check file for emptiness for example:
$file = "Snip_TrackId.txt";
if (0 < filesize($file)) {
$myfile = fopen("Snip_TrackId.txt", "r") or die("Die!");
echo "<a href='https://open.spotify.com/track/";
echo fread($myfile,filesize("Snip_TrackId.txt"));
echo "'target='_blank'><img width='18px' height='18px' title='Open with Spotify' src='np_spotify.png'><a/> <- Listen";
fclose($myfile);
}
Or if file contains spaces - check read data:
$myfile = fopen("Snip_TrackId.txt", "r") or die("Die!");
$data = trim(fread($myfile,filesize("Snip_TrackId.txt")));
if ($data) {
echo "<a href='https://open.spotify.com/track/";
echo $data;
echo "'target='_blank'><img width='18px' height='18px' title='Open with Spotify' src='np_spotify.png'><a/> <- Listen";
}
fclose($myfile);