What did I do wrong?

[KingOfHeart]

function HTMLToBBCode($message)
{
    $html = array(
    '/\<span class="ozentity">/'         => "[color=#E25500]",
    '/\<span class="ozkey">/'         => "[color=#0000FF]", 
    '/\<span class="ozquote">/'         => "[color=#303030]",    
    '/\</span>/'         => "[/color]",
    );
    $message = preg_replace(array_keys($html), array_values($html), $message);//line 27
    return $message;
}  

 

Warning: preg_replace() [function.preg-replace]: Unknown modifier 'p' in /home/thegamin/public_html/openzelda/Admin/ozcode.php on line 27

So what mistake did I make?

[.josh]

since you are using / as the pattern delimiter, you need to escape the / in </span> in your last array key.