How to run an external PHP script silently within a PHP script?
<p>For example:</p>

<p>Content of <strong>server-a.com/test.php</strong>:</p>

<pre><code>echo 'hello world one';

// now I need to call server-b.com/test.php here silently
// without interfering with user experience

echo 'hello world two';
</code></pre>

<hr>

<p>Content of <strong>server-b.com/test.php</strong>:</p>

<p><code>mail($foo, $bar, $qux); header('location: http://google.com');</code></p>

<hr>

<p>Now running <code>server-a.com/test.php</code> should output <code>hello world one hello world two</code>. And it should not redirect to google.com even though <code>server-b.com/test.php</code> was called successfully.</p>
