PHP embedding array element inside string with curly braces
<p>I would like to know what the advantage of using
curly braces is in the following context:</p>

<pre><code>$world["foo"] = "Foo World!";
echo "Hello, {$world["foo"]}.\n";
</code></pre>

<p>is over the following:</p>

<pre><code>$world["foo"] = "Foo World!";
echo "Hello, $world["foo"].\n";
</code></pre>

<p>In particular, how is it that the braces resolve any
possible ambiguity in this case (or similar cases)?</p>
