string inside array, quotes or no quotes
<p>When i assign a key value into an array of type string, does it have to be in quotes?</p>

<pre><code>define('ALBUM_COVER_50', '../discography/artwork/cover/50/');
define('ALBUM_COVER_ZOOM', '../discography/artwork/cover/800/');

$selected_artwork = array();
$cover = 'greatesthits_cs23409.jpg';

$selected_artwork[ALBUM_COVER_50.$cover] = ALBUM_COVER_ZOOM.$cover;
</code></pre>

<p>In the above snippet, do i have to put <code>ALBUM_COVER_50.$cover</code> in quotes like:</p>

<pre><code>$selected_artwork['\''.ALBUM_COVER_50.$cover.'\''] = ALBUM_COVER_ZOOM.$cover;
</code></pre>

<p>What is the best practice to go about this issue?</p>
