What difference does it makes when I use '' against ""?
<p>What difference does it makes when I use  <code>''</code> against <code>""</code> ?</p>

<p>For example:</p>

<pre><code>$example = 'Merry Christmas in Advance';
$eg = "Merry Christmas";

echo "$example";
echo '$example';


echo "$eg";
echo '$eg';
</code></pre>

<p>What would the output for each echo statements and what can we infer about <code>''</code> vs <code>""</code> in <code>PHP</code> ?</p>
