Dynamic PDF's based on a parent. (as seen on Nimja.com)

		function Header()
		{
		    $this->SetFont('Arial','I',11);
		    //Position at 1.5 cm from bottom
		    $this->SetY(5);
		    //Page number
		    $this->Cell(0,10,'Frozen Youth',0,1,'R');
		}
		function Footer()
		{
		    $this->SetFont('Arial','I',8);
		    //Position at 1.5 cm from bottom
		    $this->SetY(-15);
		    //Page number
		    $this->Cell(0,10,'Copyright 2007-2008 - Nimja.com',0,0,'L');
		    //Position at 1.5 cm from bottom
		    $this->SetY(-15);
		    //Page number
		    $this->Cell(0,10,$this->PageNo(),0,0,'R');
		}

$filename = (!empty($filename) ) ? $filename : 'Frozen_Youth.pdf';

<?php
/* MakePDF snippet:

v0.7 - Fixed the 'depcrecated' error that prevented PDFs from being proper.
v0.6 - Added multiple parents support.
v0.5 - Italic font support, limited to whole lines/paragraphs.
v0.4 - Optimizations for 100+ pages.
v0.3 - Added header and footer.
v0.2 - Numerous fixes
v0.1 - Basic work.

By Nimja - nimja.com

Usage:
 [!MakePDF? &parent=`1` !] -- Basic example
 [!MakePDF? &parent=`1,2,3` !]  -- Multiple parents
 [!MakePDF? &parent=`1` &sortBy=`pub_date` $sortDir=`asc` &where=`template=1` &filename=`Frozen_Youth.pdf` &limit=`10`!] -- Additional settings.
 
*/


/* ------------------------------------------
			Basic settings
------------------------------------------- */
$parent = $_GET['documentid'];

if (isset($parent)) {
	
	// &sortBY, field to sort by, defaults to pub_date.
	$sortBy = (!empty($sortBy) ) ? $sortBy : 'menuindex';
	
	// &sortHow, sort direction, defaults to ASC(ending).
	//	Options are: ASC, DESC
	$sortHow = (!empty($sortHow) ) ? $sortHow : 'ASC';
	
	//Additional 'filters'
	$where = (!empty($where) ) ? $where : '';

	//&filename - The filename of the PDF people will download.
	$filename = (!empty($filename) ) ? $filename : 'Frozen_Youth.pdf';

	//&limit - Max number of pages we will retrieve. Leave empty or 0 for all.
	$limit = (!empty($limit) ) ? $limit : '';
	
	//Fields we use.
	$fields = 'longtitle,description,content';
	
	$basepath = $modx->config['base_path']."assets/snippets/makepdf/";
	$classpath = $basepath.'class/';


	//Use MODX function to get documents
	$parents = split(',', $parent);
	$pages = Array();
	foreach($parents as $par) {
		$page = $modx->getDocument($par, $fields, 1, 0);
		array_push($pages, $page);
	}

/* ------------------------------------------
			Start PDF and set the settings.
------------------------------------------- */

	// initiate FPDI 
	$pdf = new PDF(); 
	// add a page 
	$pdf->AddPage(); 
	// set the sourcefile 
	$pdf->setSourceFile($basepath.'Page.pdf'); 
	$pdf->SetAuthor('Nimja');
	$pdf->SetCreator('Nimja');
	$pdf->SetTitle('Frozen Youth');
	
	// import page 1 
	$templatePage = $pdf->importPage(1); 
	// use the imported page and place it on the first page. After this it will be added to every page.
	$pdf->useTemplate($templatePage);
	// set the template to be applied automatically.
	$pdf->setTemplate($templatePage); 

	$pdf->SetFont('Arial'); 
	$pdf->SetTextColor(0,0,0); 
	$pdf->SetLineWidth(.25);
	$pdf->SetDrawColor(0,0,0);
	$pdf->SetMargins(10,10);
	
	$newpage = false;

	$remove = Array("\r", '<b>', '</b>');
	$clean = Array('<i>', '</i>');


/* ------------------------------------------
			Start content.
------------------------------------------- */

	$c = 0;
	$italic = false;
	foreach ($pages as $page) {
		//echo $page['longtitle'].' - '.$page['introtext'].'<br />';
		$chapter = $page['longtitle'];
		$title = $page['description'];
		$content = str_replace($remove, '', $page['content']);
		
		//Start at the top of a page after 10 chapters. Because I'm base-10 addicted.
		if ($c > 9) {
			$pdf->AddPage();
			$c=0;
		}

		//Set the title.
		$pdf->SetX(10);
		$pdf->SetFont('Arial','',18);
		$pdf->Cell(0,7,$chapter.' - '.$title,'B',1,'L');

		//Add some space between the title and the content.
		$pdf->Ln(3);

		$content = split("\n", $content);

		//Handle content per line/block.		
		foreach ($content as $par) {
			$line = trim($par);

			//Space between paragraphs (a little less than a whole line, looks nicer).
			if (empty($line) ) {
				$pdf->Ln(3);
				
			} else {
				if (strpos($line, '<i>') > -1) $italic = true;

				//Switch between italic and normal. Only usable for whole paragraphs/lines for now.
				if ($italic) {
					$pdf->SetFont('Arial','i',11);
				} else {
					$pdf->SetFont('Arial','',11);
				}
				if (strpos($line, '</i>')) $italic = false;
				
				$line = str_replace($clean, '', $line);
				$pdf->MultiCell(0,4.5,$line,0,1,'L');
			}
		}
		$pdf->Ln(10);
		$italic = false;
		$c++;
	}

	$pdf->Output('Frozen_Youth.pdf', 'd'); 
	
} else {
	//Output error message because of missing parent ID
	echo 'Parent ID missing!';
}
?>

class PDF extends FPDI {

	// initiate FPDI 
	$pdf = new PDFI();