Imploding nested arrays
<p>If I have an array structured like this:</p>

<pre><code>$array[index]['first_name']
$array[index]['last_name']
</code></pre>

<p>Is there an easy way to implode it into something like first_name last_name,first_name last_name, etc. for all the indices?</p>

<p>Implode didn't seem to do what I wanted for something like this. Currently I'm just looping over the whole thing, but it's a SIGNIFICANT bottleneck.</p>
