Combine an array to string in PHP
<p>I have a below array in PHP</p>

<pre><code>$arrOrders['remains'] = 'ASC';
$arrOrders['rate']    = 'DESC';
</code></pre>

<p>How can I use combine to a string like just with native function?</p>

<pre><code>$str = 'remain ASC, rate DESC';
</code></pre>
