what is "php://input"? It mainly seen in webservice
<p>What is the relevance of <code>php://input</code> in the following snippet, and what is it used for?</p>

<pre><code>$json_string = GPTake(array('json_string'));
$handle = fopen('php://input', 'r');
$jsonInput = fgets($handle);

$test = json_decode($jsonInput);
</code></pre>
