 enable them. If they are,
try adding this at the very beginning of your script:
<div class="doc-source">
<pre><code>ob_end_clean();</code></pre>
</div>
</li>

<li id='q3'>
<p><b>3.</b> <span class='question'>Accented letters are replaced with some strange characters like é.</span></p>
Don't use UTF-8 with the standard fonts; they expect text encoded in ISO-8859-1 or windows-1252.
You can use utf8_decode() to perform a conversion to ISO-8859-1:
<div class="doc-source">
<pre><code>$str = utf8_decode($str);<