จะเขียน bbcode ยังไงดีเมื่อเจอ code iframe ของ google map

<?php

function bbcode_format ($str) {  
   // $str = htmlentities($str);  ÀÒÉÒä·Â¨Ðà¾Õé¹
      $str = nl2br(htmlspecialchars($str));
  
    $simple_search = array(  
                //added line break  
                '/\[br\]/is',  
                '/\[b\](.*?)\[\/b\]/is',  
                '/\[i\](.*?)\[\/i\]/is',  
                '/\[u\](.*?)\[\/u\]/is',  
                '/\[url\=(.*?)\](.*?)\[\/url\]/is',  
                '/\[url\](.*?)\[\/url\]/is',  
                '/\[align\=(left|center|right)\](.*?)\[\/align\]/is',  
                '/\[img\](.*?)\[\/img\]/is',  
                '/\[mail\=(.*?)\](.*?)\[\/mail\]/is',  
                '/\[mail\](.*?)\[\/mail\]/is',  
                '/\[font\=(.*?)\](.*?)\[\/font\]/is',  
                '/\[size\=(.*?)\](.*?)\[\/size\]/is',  
                '/\[color\=(.*?)\](.*?)\[\/color\]/is',  
                  //added textarea for code presentation  
               '/\[codearea\](.*?)\[\/codearea\]/is',  
                 //added pre class for code presentation  
              '/\[code\](.*?)\[\/code\]/is',  
                //added paragraph  
              '/\[p\](.*?)\[\/p\]/is',  
                );  
  
    $simple_replace = array(  
				//added line break  
               '<br />',  
                '<strong>$1</strong>',  
                '<em>$1</em>',  
                '<u>$1</u>',  
				// added nofollow to prevent spam  
                '<a href="$1" rel="nofollow" title="$2 - $1"  target="_blank">$2</a>',  
                '<a href="$1" rel="nofollow" title="$1"  target="_blank">$1</a>',  
                '<div style="text-align: $1;">$2</div>',  
				//added alt attribute for validation  
                '<img src="$1" alt="" />',  
                '<a href="mailto:$1"  target="_blank">$2</a>',  
                '<a href="mailto:$1"  target="_blank">$1</a>',  
                '<span style="font-family: $1;">$2</span>',  
                '<span style="font-size: $1;">$2</span>',  
                '<span style="color: $1;">$2</span>',  
				//added textarea for code presentation  
				'<textarea class="code_container" rows="30" cols="70">$1</textarea>',  
				//added pre class for code presentation  
				'<pre class="code">$1</pre>',  
				//added paragraph  
				'<p>$1</p>', 				
                );  
  
    // Do simple BBCode's  
    $str = preg_replace ($simple_search, $simple_replace, $str);  
  
    // Do <blockquote> BBCode  
    $str = bbcode_quote ($str);  
  
    $str = clickable_link($str);
  
    return $str;  
}  
  
  
  
function bbcode_quote ($str) {  
    //added div and class for quotes  
    $open = '<blockquote><div class="Mainmenu">quote</div><table width="90%" height="56" border="1" cellpadding="0" cellspacing="0" bordercolor="#000000"><tr><td class="text">';  
    $close = '</td></tr></table></blockquote>';  
  
    // How often is the open tag?  
    preg_match_all ('/\[quote\]/i', $str, $matches);  
    $opentags = count($matches['0']);  
  
    // How often is the close tag?  
    preg_match_all ('/\[\/quote\]/i', $str, $matches);  
    $closetags = count($matches['0']);  
  
    // Check how many tags have been unclosed  
    // And add the unclosing tag at the end of the message  
    $unclosed = $opentags - $closetags;  
    for ($i = 0; $i < $unclosed; $i++) {  
        $str .= '</div></blockquote>';  
    }  
  
    // Do replacement  
    $str = str_replace ('[' . 'quote]', $open, $str);  
    $str = str_replace ('[/' . 'quote]', $close, $str);  
  
    return $str;  
} 

function clickable_link($str)  // This function is to create clickable link when we post some normal text link
{
# this functions deserves credit to the fine folks at phpbb.com

$text = preg_replace('#(script|about|applet|activex|chrome):#is', "\\1:", $str);

// pad it with a space so we can match things at the start of the 1st line.
$ret = ' ' . $str;

// matches an "xxxx://yyyy" URL at the start of a line, or after a space.
// xxxx can only be alpha characters.
// yyyy is anything up to the first space, newline, comma, double quote or <
//$ret = preg_replace("#(^|[\n ])([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "\\1<a href=\"\\2\" rel=\"nofollow\" target=\"_blank\">\\2</a>", $ret);

// matches a "www|ftp.xxxx.yyyy[/zzzz]" kinda lazy URL thing
// Must contain at least 2 dots. xxxx contains either alphanum, or "-"
// zzzz is optional.. will contain everything up to the first space, newline,
// comma, double quote or <.
$ret = preg_replace("#(^|[\n ])((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "\\1<a href=\"http://\\2\" target=\"_blank\">\\2</a>", $ret);

// matches an email@domain type address at the start of a line, or after a space.
// Note: Only the followed chars are valid; alphanums, "-", "_" and or ".".
$ret = preg_replace("#(^|[\n ])([a-z0-9&\-_.]+?)@([\w\-]+\.([\w\-\.]+\.)*[\w]+)#i", "\\1<a href=\"mailto:\\2@\\3\">\\2@\\3</a>", $ret);

// Remove our padding..
$ret = substr($ret, 1);
return $ret;
}
?>