|  tags as it changes all.
So after making your edits to the core file, i thought of copying the whole function for the mycode_parse_code and added a copy of it below it and tried to create the custom code just by changing all the $code instances in that function with the new mycode name, but it had thrown some error when i used that code tags ex: [newtag] [/newtag]
Code USed:
[code]/**
	* Parses quotes with post id and/or dateline.
	*
	* @param string The message to be parsed
	* @param string The username to be parsed
	* @param boolean Are we formatting as text?
	* @return string The parsed message.
	*/
	function mycode_parse_post_quotes($message, $username, $text_only=false)
	{
		global $lang, $templates, $theme, $mybb;
		$linkback = $date = "";
		$message = trim($message);
		$message = preg_replace("#(^<br(\s?)(\/?)>|<br(\s?)(\/?)>$)#i", "", $message);
		if(!$message) return '';
		$message = str_replace('\"', '"', $message);
		$username = str_replace('\"', '"', $username)."'";
		$delete_quote = true;
		preg_match("#pid=(?:"|\"|')?([0-9]+)[\"']?(?:"|\"|')?#i", $username, $match);
		if(intval($match[1]))
		{
			$pid = intval($match[1]);
			$url = $mybb->settings['bburl']."/".get_post_link($pid)."#pid$pid";
			if(defined("IN_ARCHIVE"))
			{
				$linkback = " <a href=\"{$url}\">[ -> ]</a>";
			}
			else
			{
				eval("\$linkback = \" ".$templates->get("postbit_gotopost", 1, 0)."\";");
			}
			
			$username = preg_replace("#(?:"|\"|')? pid=(?:"|\"|')?[0-9]+[\"']?(?:"|\"|')?#i", '', $username);
			$delete_quote = false;
		}
		unset($match);
		preg_match("#dateline=(?:"|\"|')?([0-9]+)(?:"|\"|')?#i", $username, $match);
		if(intval($match[1]))
		{
			if($match[1] < TIME_NOW)
			{
				$postdate = my_date($mybb->settings['dateformat'], intval($match[1]));
				$posttime = my_date($mybb->settings['timeformat'], intval($match[1]));
				$date = " ({$postdate} {$posttime})";
			}
			$username = preg_replace("#(?:"|\"|')? dateline=(?:"|\"|')?[0-9]+(?:"|\"|')?#i", '', $username);
			$delete_quote = false;
		}
		if($delete_quote)
		{
			$username = my_substr($username, 0, my_strlen($username)-1);
		}
		if($text_only)
		{
			return "\n".htmlspecialchars_uni($username)." $lang->wrote{$date}\n--\n{$message}\n--\n";
		}
		else
		{
			$span = "";
			if(!$delete_quote)
			{
				$span = "<span>{$date}</span>";
			}
			
			return "<blockquote><cite>{$span}".htmlspecialchars_uni($username)." $lang->wrote{$linkback}</cite>{$message}</blockquote>\n";
		}
	}
	/**
	* Parses code MyCode.
	*
	* @param string The message to be parsed
	* @param boolean Are we formatting as text?
	* @return string The parsed message.
	*/
	/**function mycode_parse_code($code, $text_only=false)
	{
		global $lang;
		if($text_only == true)
		{
			return "\n{$lang->code}\n--\n{$code}\n--\n";
		}
		// Clean the string before parsing.
		$code = preg_replace('#^(\t*)(\n|\r|\0|\x0B| )*#', '\\1', $code);
		$code = rtrim($code);
		$original = preg_replace('#^\t*#', '', $code);
		if(empty($original))
		{
			return;
		}
		$code = str_replace('$', '$', $code);
		$code = preg_replace('#\$([0-9])#', '\\\$\\1', $code);
		$code = str_replace('\\', '\', $code);
		$code = preg_replace('#([>\s()]|^)((http|ftp|news)\://([^/"\s<\[.]+\.)+\w+(\:[0-9]+)?(/[^"\s<\[]*)?)#i', '$1<a href="$2">$2</a>', $code);
		$code = str_replace("\t", '    ', $code);
		$code = str_replace("  ", '  ', $code);
		return "<div class=\"codeblock\">\n<div class=\"title\">".$lang->code."\n</div><div class=\"body\" dir=\"ltr\"><code>".$code."</code></div></div>\n";
	}
	**/
	function mycode_parse_cdkpu($cdkpu, $text_only=false)
	{
		global $lang;
		if($text_only == true)
		{
			return "\n{$lang->code}\n--\n{$cdkpu}\n--\n";
		}
		// Clean the string before parsing.
		$cdkpu = preg_replace('#^(\t*)(\n|\r|\0|\x0B| )*#', '\\1', $cdkpu);
		$cdkpu = rtrim($cdkpu);
		$original = preg_replace('#^\t*#', '', $cdkpu);
		if(empty($original))
		{
			return;
		}
		$cdkpu = str_replace('$', '$', $cdkpu);
		$cdkpu = preg_replace('#\$([0-9])#', '\\\$\\1', $cdkpu);
		$cdkpu = str_replace('\\', '\', $cdkpu);
		$cdkpu = preg_replace('#([>\s()]|^)((http|ftp|news)\://([^/"\s<\[.]+\.)+\w+(\:[0-9]+)?(/[^"\s<\[]*)?)#i', '$1<a href="$2">$2</a>', $cdkpu);
		$cdkpu = str_replace("\t", '    ', $cdkpu);
		$cdkpu = str_replace("  ", '  ', $cdkpu);
		return "<div class=\"codeblock\">\n<div class=\"title\">".$lang->code."\n</div><div class=\"body\" dir=\"ltr\"><cdkpu>".$cdkpu."</cdkpu></div></div>\n";
	}
	/**
	* Parses PHP code MyCode.
	*
	* @param string The message to be parsed
	* @param boolean Whether or not it should return it as pre-wrapped in a div or not.
	* @param boolean Are we formatting as text?
	* @return string The parsed message.
	*/
	function mycode_parse_php($str, $bare_return = false, $text_only = false)
	{
		global $lang;
		if($text_only == true)
		{
			return "\n{$lang->php_code}\n--\n$str\n--\n";
		}
		// Clean the string before parsing except tab spaces.
		$str = preg_replace('#^(\t*)(\n|\r|\0|\x0B| )*#', '\\1', $str);
		$str = rtrim($str);
		$original = preg_replace('#^\t*#', '', $str);
		if(empty($original))
		{
			return;
		}
		$str = str_replace('&', '&', $str);
		$str = str_replace('<', '<', $str);
		$str = str_replace('>', '>', $str);
		// See if open and close tags are provided.
		$added_open_tag = false;
		if(!preg_match("#^\s*<\?#si", $str))
		{
			$added_open_tag = true;
			$str = "<?php \n".$str;
		}
		$added_end_tag = false;
		if(!preg_match("#\?>\s*$#si", $str))
		{
			$added_end_tag = true;
			$str = $str." \n?>";
		}
		$code = @highlight_string($str, true);
		// Do the actual replacing.
		$code = preg_replace('#<code>\s*<span style="color: \#000000">\s*#i', "<code>", $code);
		$code = preg_replace("#</span>\s*</code>#", "</code>", $code);
		$code = preg_replace("#</span>(\r\n?|\n?)</code>#", "</span></code>", $code);
		$code = str_replace("\\", '\', $code);
		$code = str_replace('$', '$', $code);
		$code = preg_replace("#&\#([0-9]+);#si", "&#$1;", $code);
		if($added_open_tag)
		{
			$code = preg_replace("#<code><span style=\"color: \#([A-Z0-9]{6})\"><\?php( | )(<br />?)#", "<code><span style=\"color: #$1\">", $code);
		}
		if($added_end_tag)
		{
			$code = str_replace("?></span></code>", "</span></code>", $code);
			// Wait a minute. It fails highlighting? Stupid highlighter.
			$code = str_replace("?></code>", "</code>", $code);
		}
		$code = preg_replace("#<span style=\"color: \#([A-Z0-9]{6})\"></span>#", "", $code);
		$code = str_replace("<code>", "<div dir=\"ltr\"><code>", $code);
		$code = str_replace("</code>", "</code></div>", $code);
		$code = preg_replace("# *$#", "", $code);
		if($bare_return)
		{
			return $code;
		}
		// Send back the code all nice and pretty
		return "<div class=\"codeblock phpcodeblock\"><div class=\"title\">$lang->php_code\n</div><div class=\"body\">".$code."</div></div>\n";
	}
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