Simple Snippet to read and show content from file - php

Question

I am looking for a simple solution to add a Snippet in my index.php file to load and display the content shown in a file from an other Domain.
Plan was to add the Code to the 'Footer' before to show a floating ad on several of my websites.
Sourcesite: http://domainX.tld/floating/floater.txt
Content of file: little bit css for styling of the ad + script snippet for a close button + html to get it into shape.
Target Site gets a simple snippet to show content from txt file as its own content.
I have tried by now
<?php
$StrLessDescription = ("//domainX.tld/floating/floater.txt");
$file_contents = file_get_contents($StrLessDescription);
?>
Site loads but doen't shows anything of my code.
<?php
$handle = fopen("//domainX.tld/floating/floater.txt", "rb");
$delimiter = ",";
while (!feof($handle) ) {
$line = fgets($handle);
$data = explode($delimiter, $line);
foreach($data as $v) {
echo $v;
}
}
fclose($handle);
?>
Site wouldn't even load.
<?php
$f = fopen("//domain.tld/floating/floatr.txt", "r");
// Read line by line until end of file
while(!feof($f)) {
echo fgets($f) . "<br />";
}
fclose($f);
?>
Creates an endless amount of where my Code should be
Other Fails i have deleted already.
Once i had a simple snippet that had done the trick, does one have any idea how to accomplish that again?

Answer 1

This should do the trick:
<?php
echo file_get_contents('//domain.tld/floating/floatr.txt');

Answer 2

Sticking to the straightest way to do it as your intention is and supposing that:
URL you provide for the txt file is correct
you have read access to it
the file has contents to display
your PHP version is (PHP 4 >= 4.3.0, PHP 5, PHP 7) to support
the file_get_contents() function
You are missing in your first approach to echo the contents of your variable $StrLessDescription to send it to output.
<?php
$StrLessDescription = ("//domainX.tld/floating/floater.txt");
$file_contents = file_get_contents($StrLessDescription);
echo $file_contents;
?>
Remember that for large projects you could consider using a framework to achieve the same goal in a more organized way. This is a solution to a quick-and-dirty approach you inquiry.