shortened php if else block
<p>what is the shorted if else block for this. I seen it somewhere before but cant remember it.</p>

<pre><code>if (isset($_POST['value')){
 $value = $_POST['value'];
} elseif (isset($_GET['value'])){
 $value = $_GET['value'];
} else {
 $value = '';
}
</code></pre>
