BB-Code Function

<?php 
 
function bbcode($string){ 
 
$string = nl2br(htmlspecialchars($string)); 
 
$patterns = array( 
					'`\[b\](.+?)\[/b\]`is', 
                    '`\[i\](.+?)\[/i\]`is', 
                    '`\[u\](.+?)\[/u\]`is', 
                    '`\[strike\](.+?)\[/strike\]`is', 
                    '`\[color=#([0-9]{6})\](.+?)\[/color\]`is', 
                    '`\[email\](.+?)\[/email\]`is', 
                    '`\[img\](.+?)\[/img\]`is', 
                    '`\[url=([a-z0-9]+://)([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*?)?)\](.*?)\[/url\]`si', 
                    '`\[url\]([a-z0-9]+?://){1}([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*)?)\[/url\]`si', 
                    '`\[url\]((www|ftp)\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*?)?)\[/url\]`si', 
                    '`\[flash=([0-9]+),([0-9]+)\](.+?)\[/flash\]`is', 
                    '`\[quote\](.+?)\[/quote\]`is', 
                    '`\[indent](.+?)\[/indent\]`is', 
                    '`\[size=([1-6]+)\](.+?)\[/size\]`is'); 
 
$replaces =  array( 
					'<strong>\\1</strong>', 
                    '<em>\\1</em>', 
                    '<span style="border-bottom: 1px dotted">\\1</span>', 
                    '<strike>\\1</strike>', 
                    '<span style="color:#\1;">\2</span>', 
                    '<a href="mailto:\1">\1</a>', 
                    '<img src="\1" alt="" style="border:0px;" />', 
                    '<a href="\1\2">\6</a>', 
                    '<a href="\1\2">\1\2</a>', 
                    '<a href="http://\1">\1</a>', 
                    '<object width="\1" height="\2"><param name="movie" value="\3" /><embed src="\3" width="\1" height="\2"></embed></object>', 
                    '<strong>Quote:</strong><div style="margin:0px 10px;padding:5px;background-color:#F7F7F7;border:1px dotted #CCCCCC;width:80%;"><em>\1</em></div>', 
                    '<pre>\\1</pre>', 
                    '<h\1>\2</h\1>'); 
 
$string = preg_replace($patterns, $replaces , $string); 
 
return $string; 
} 
?>