Laravel Excel: how to get value of a cell?
<p>I've loaded <code>.xls</code> file with <a href="https://github.com/Maatwebsite/Laravel-Excel" rel="nofollow">Laravel Excel</a>:</p>

<pre><code>Excel::load('public/files/20160621.xls', function($reader) {
    // read a cell value
});
</code></pre>

<p>How do I read values of cells of the loaded excel file? Documentation seems to be unclear on that part.</p>