Description:
------------
Hello,

When I try to highlight some source code, the output is sometimes blue (#0000BB) when it has to be black.




Reproduce code:
---------------
<?php
$string = '<?php echo "test"; ?> blaa blabla ? die, test test';
echo highlight_string ($string,1);
?>

Expected result:
----------------
in HTML source:

<code><font color="#000000">
<font color="#0000BB">&lt;?php </font><font color="#007700">echo </font><font color="#DD0000">"test"</font><font color="#007700">; </font><font color="#0000BB">?&gt;</font> blaa blabla ? die, test test</font>
</code>

Actual result:
--------------
in HTML source:

<code><font color="#000000">
<font color="#0000BB">&lt;?php echo </font><font color="#DD0000">"test"</font><font color="#0000BB">; ?&gt; blaa blabla ? die, test test</font>
</font>
</code>