PHP fopen function only works one way - php

Question

Ok let me explain what's goin one:
I have 2 hosts/websites, Host A and Host B. When i'm using the php function fopen code on Host A to Host B it works, i can read the title of the page. BUT when i go from Host B to Host A it won't work. And now the strange thing when i go from Host B to example.com. It does work??
I think that it's a wrong setting on Host A but, i can't change that much on the server. Does somebody know how to fix the problem? So i can go from Host B and read the title of a file on Host A?
Code that i use to open a file (and is hosted on Host B) and search the title:
$file = fopen ("http://promike360.esy.es/main_site/", "r"); //This is HOST A
if ($file) {
echo "<p>Loadig remote file succesfull.</p>";
} else {
echo "<p>Unable to open remote file.</p>";
exit;
}
while (!feof ($file)) {
$line = fgets ($file, 1024);
/* This only works if the title and its tags are on one line */
if (preg_match ("#\<title\>(.*)\</title\>#i", $line, $out)) {
$title = $out[1];
echo $title;
break;
}
}
fclose($file);

Answer 1

I fixed it!
After a long time, i came with a solution for my problem.
But first, the problem
I have 2 hosts, Host A and Host B. I wanted to read a file on Host A by using a script (that is written in PHP and is using the fopen function) on Host B.
This did not work. What did work, was reading a file that is hosted on Host B and read it by the script on Host A. (And no, the file-permissions was configured in the right way).
This is realy strange, and even at this moment i'm writing this. I still don't know how to solve it.
The solution
The solution to solve this problem, is using jQuery to request the file on Host A and add 1 row of php code to the file on Host A.
[PHP] The code on Host A what needs to be inside the php file.
header('Access-Control-Allow-Origin: *');
This says to your browser that you can go to this host. Otherwise the browser will block your request (This is what someone told me).
[jQuery/Javascript] The code that i used to read the file
$.get("http://example.com/file.php", function( data ) {
});