<?php
class PDF_Bookmark extends FPDF
{	
protected $outlines = array();
protected $outlineRoot;

function Bookmark($txt, $isUTF8=false, $level=0, $y=0)
{
	if(!$isUTF8)
		$txt = $this->_UTF8encode($txt);
	if($y==-1)
		$y = $this->GetY();
	$this->outlines[] = array('t'=>$txt, 'l'=>$level, 'y'=>($this->h-$y)*$this->k, 'p'=>$this->PageNo());
}

function _putbookmarks()
{
	$nb = count($this->outlines);
	if($nb==0)
		return;
	$lru = array();
	$level = 0;
	foreach($this->outlines as $i=>$o)
	{
		if($o['l']>0)
		{
			$parent = $lru[$o['l']-1];
			// Set parent and last pointers
			$this->outlines[$i]['parent'] = $parent;
			$this->outlines[$parent]['last'] = $i;
			if($o['l']>$level)
			{
				// Level increasing: set first pointer
				$this->outlines[$parent]['first'] = $i;
			}
		}
		else
			$this->outlines[$i]['parent'] = $nb;
		if($o['l']<=$level && $i>0)
		{
			// Set prev and next pointers
			$prev = $lru[$o['l']];
			$this->outlines[$prev]['next'] = $i;
			$this->outlines[$i]['prev'] = $prev;
		}
		$lru[$o['l']] = $i;
		$level = $o['l'];
	}
	// Outline items
	$n = $this->n+1;
	foreach($this->outlines as $i=>$o)
	{
		$this->_newobj();
		$this->_put('<</Title '.$this->_textstring($o['t']));
		$this->_put('/Parent '.($n+$o['parent']).' 0 R');
		if(isset($o['prev']))
			$this->_put('/Prev '.($n+$o['prev']).' 0 R');
		if(isset($o['next']))
			$this->_put('/Next '.($n+$o['next']).' 0 R');
		if(isset($o['first']))
			$this->_put('/First '.($n+$o['first']).' 0 R');
		if(isset($o['last']))
			$this->_put('/Last '.($n+$o['last']).' 0 R');
		$this->_put(sprintf('/Dest [%d 0 R /XYZ 0 %.2F null]',$this->PageInfo[$o['p']]['n'],$o['y']));
		$this->_put('/Count 0>>');
		$this->_put('endobj');
	}
	// Outline root
	$this->_newobj();
	$this->outlineRoot = $this->n;
	$this->_put('<</Type /Outlines /First '.$n.' 0 R');
	$this->_put('/Last '.($n+$lru[0]).' 0 R>>');
	$this->_put('endobj');
}

function _putresources()
{
    parent::_putresources();
    $this->_putbookmarks();
}

function _putcatalog()
{
	parent::_putcatalog();
	if(count($this->outlines)>0)
	{
		$this->_put('/Outlines '.$this->outlineRoot.' 0 R');
		$this->_put('/PageMode /UseOutlines');
	}
}
}
?>
