Backslash in PHP -- what does it mean?
<p>I just saw the use of a backslash in reference to a PHP object and was curious about it (never seen this before).  What does it mean?</p>

<pre><code>$mail = new SendGrid\Mail();
</code></pre>

<p>If you're curious, here's <a href="http://docs.sendgrid.com/documentation/get-started/integrate/examples/php-email-example-using-smtp/" rel="nofollow">SendGrid's documentation</a>.</p>
