Using Curly Braces with $_REQUEST to retrieve its indexes
<p>I've been reviewing a sample code to learn PHP and what I saw made me confused in the following code:</p>

<pre><code>$in = $_REQUEST;
require_once 'utils.php';
require_once 'utils_user.php';
require_once 'utils_email.php';
require_once 'utils_affiliate.php';

#Load Settings
$globalSettings = parse_ini_file("settings.ini", true);

if(isInDevelMode())
{
    $system = "devel";
}

if(strlen($in{'system'} &gt; 0))
{
    $system = strip_tags($in{'system'});
}
</code></pre>

<p>Here a variable called <code>$in</code> was created and <code>$_REQUEST</code> was assigned to it and then later on in the second if-statement it was written like <code>if(strlen($in{'system'} &gt; 0))</code> and I don't quite understand what <code>$in{'system'}</code> here. It doesn't look like an array but $_REQUEST is an array-like to retrieve its content. Can somebody tell me what these curly braces are used for after <code>$in</code> variable...</p>

<p>Thanks. </p>
