คือ ผมทำ class bbcode อะคับ แล้วเจอปัญหา ผมว่า ต้องแก้ไขตรงบันทัดนี้ แต่ยังคิดไม่ออกว่า จะแก้ไขยังงัย เหอๆ

<?php
class bbcode 
{
	/**
	* html list tyle
	*
	* @var array
	*/		
	private $listStyle;

	/**
	* syntag of syntaxHighlighter
	*
	* @var array
	*/		
	private $syntaxHighlighter;

	/**
	* custom BBcode
	*
	* @var array
	*/	
	private $customBBCode;

	/**
	* html Replacement 
	*
	* @var string
	*/	
	private $htmlReplacement;

	/**
	* tag
	*
	* @var string
	*/	
	private $tag;

	/**
	* remove message in code tag
	*
	* @var array
	*/	
	private $removeMSGCodeTag = array('<br />','\n');

	/**
	* class constructor 
	* 
	* @return void
	*/
	public function __construct() 
	{
		$this->listStyle = array('1' => '1','a' => 'a','A' => 'A', 'i' => 'i', 'I' => 'I');

		$this->syntaxHighlighter = array(
											'php' => 'php',
											'js' => 'js',
											'asp' => 'asp',
											'sql' => 'sql',
											'css' => 'css',
											'xml' => 'xml',
											'java' => 'java
											');
		$this->customBBCode = array(
										'1' => array(
														'li'	=>	'<li>'
														),
										'2' => array(
														'b'		=>	'<strong>{message}</strong>',
														'i'		=>	'<em>{message}</em>',
														'u'		=>	'<u>{message}</u>'
														),
										'3' => array(
														'color'	=>	'<span style="color: {option}">{message}</span>',
														'quote' =>	"					
					<div class='quotemessage'>
						<table width='90%' border='0' cellpadding='0' cellspacing='0'>
							<tr>
								<td>
								<div class='quote_title' style='padding:5px; margin:0px;'><b>ข้อความโดย :: {option}</b></div>
								<div class='quotecontent' style='padding:5px; margin:0px;'>{message}</div>
								</td>
							</tr>
						</table> 
					</div>"
														)
										);
	}


	/**
	* array to remove message in code text
	*
	* @param	array $removeMSGCodeTag (array('<br />','\n'))	
	* 
	* @return	void
	*/
	public function setremoveMSGCodeTag($removeMSGCodeTag) 
	{
		$this->removeMSGCodeTag = $removeMSGCodeTag;
	}

	/**
	* add new tag
	*
	* @param	string $type (s, d, t)
	*				1 : single tag
	*				2 : double tag
	*				3 : tripple tag
	* @param	string $tag ( video )
	* @param	string $html
	* 
	* @return	void
	*/
	public function addTag($type, $tag, $html) 
	{
		$this->customBBCode[$type][$tag] = $html;
	}

	/**
	* parse bbcode
	*
	* @param	string $text
	* 
	* @return	string
	*/
	final public function parse($text) 
	{

		if ( count( $this->customBBCode['1'] ) > 0 ) 
		{
			foreach ( $this->customBBCode['1'] AS $tag => $html) 
			{
				$text = preg_replace('#\['.$tag.'\]#si', '<'.$tag.' />', $text);
			}
		}

		if ( count( $this->customBBCode['2'] ) > 0 ) 
		{
			foreach ( $this->customBBCode['2'] AS $tag => $html) 
			{
				$this->htmlReplacement = $html;
				$this->tag = $tag;
				$text = $this->customTag( $text );
			}
		}

		if ( count( $this->customBBCode['3'] ) > 0 ) 
		{
			foreach ( $this->customBBCode['3'] as $tag => $html)
			{
				$this->htmlReplacement = $html;
				$this->tag = $tag;
				$text = $this->customOptionTag( $text );
			}
		}

		$text = self::imgTag($text);
		$text = self::urlTag($text);
		$text = self::emailTag($text);
		$text = $this->listTag($text);
		$text = $this->codeTag($text);

		return $text;
	}

	/**
	* parse img tag
	*
	* @param	string $text
	* 
	* @return	void
	*/
	public static function imgTag( $text )
	{
		return preg_replace('#\[img](.*?)\[/img\]#si', '<img src=\'\\1\' alt="" title="" />', $text);
	}

	/**
	* parse url tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public static function urlTag( $text )
	{
		$text = preg_replace('#\[url=(.*?)\](.*?)\[/url\]#si', '<a href=\'\\1\' alt="" title="">\\2</a>', $text);
		$text = preg_replace('#\[link=(.*?)\](.*?)\[/link\]#si', '<a href=\'\\1\' alt="" title="">\\2</a>', $text);
		return $text;
	}

	/**
	* parse url tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public static function emailTag( $text )
	{
		$text = preg_replace('#\[email](.*?)\[/email\]#si', '<a href="mailto:\'\\1\'" alt="" title="">\\1</a>', $text);
		return $text;
	}

	/**
	* parse custom tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public function customTag( $text )
	{
		return preg_replace_callback('#\[' . $this->tag . '\](.*?)\[/' . $this->tag . '\]#si', array( &$this, 'customTagCallBack' ), $text);
	}

	/**
	* parse custom tag callback
	*
	* @param	string $match
	* 
	* @return	string
	*/
	public function customTagCallBack( $match )
	{
		return str_replace('{message}' ,$match[1], $this->htmlReplacement);
	}

	/**
	* parse custom option tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public function customOptionTag( $text )
	{
		return preg_replace_callback('#\[' . $this->tag . '=(.*?)\](.*?)\[/' . $this->tag . '\]#si', array( &$this, 'customOptionTagCallBack' ), $text);
	}

	/**
	* parse custom option tag callback
	*
	* @param	string $match
	* 
	* @return	string
	*/
	public function customOptionTagCallBack( $match )
	{
		$text = str_replace('{message}' ,$match[2], $this->htmlReplacement);
		return str_replace('{option}' ,$match[1], $text);
	}

	/**
	* parse list tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public function listTag( $text )
	{
		return preg_replace_callback('#\[list=(.*?)\](.*?)\[/list\]#si', array( &$this, 'listTagCallBack' ), $text);
	}

	/**
	* parse list tag callback
	*
	* @param	string $match
	* 
	* @return	string
	*/
	public function listTagCallBack( $match )
	{
		return '<ol type="' . $this->listStyle[$match[1]] . '">' . $match[2] . '</ol>';
	}

	/**
	* parse code tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public function codeTag( $text )
	{
		return preg_replace_callback('#\[code=(.*?)\](.*?)\[/code\]#si', array( &$this, 'codeTagCallBack' ), $text);
	}

	/**
	* parse code tag callback
	*
	* @param	string $match
	* 
	* @return	string
	*/
	public function codeTagCallBack( $match )
	{
		if ( count( $this->removeMSGCodeTag) > 0 )
		{
			foreach ( $this->removeMSGCodeTag AS $value )
			{
				$match[2] = str_replace( $value,'',$match[2] );
			}
		}
		return '<pre class="brush: ' . $this->syntaxHighlighter[$match[1]] . '">' . $match[2] . '</pre>';
	}
}[/code]

คือ ถ้า bbcode ไม่ซ้อนกัน ก็ไม่มีปัญหา แต่มันซ้อนกันเมือไร จบเลย

ผมใช้แบบนี้อะ

	/**
	* parse custom tag
	*
	* @param	string $text
	* 
	* @return	string
	*/
	public function customTag( $text )
	{
		return preg_replace_callback('#\[' . $this->tag . '\](.*?)\[/' . $this->tag . '\]#si', array( &$this, 'customTagCallBack' ), $text);
	}

	/**
	* parse custom tag callback
	*
	* @param	string $match
	* 
	* @return	string
	*/
	public function customTagCallBack( $match )
	{
		return str_replace('{message}' ,$match[1], $this->htmlReplacement);
	}
?>