Memory optimization

This extension saves the pages to the destination file as soon as they are finished, which solves the issue

Informations

Author: Olivier
License: FPDF

Description

The standard FPDF class builds the document entirely in memory, which can be problematic for large documents. This extension saves the pages to the destination file as soon as they are finished, which solves the issue.

After you have created the object, call Open() with the name of the file:

$pdf = new FPDF2File();
$pdf->Open('doc.pdf');

and when the document is finished, call Output():

$pdf->Output();

Note: you can't use the AliasNbPages() method with this extension.

Source

<?php require('fpdf.php'); class FPDF2File extends FPDF { protected $f; function Open($file='doc.pdf') { if(FPDF_VERSION<'1.8') $this->Error('Version 1.8 or above is required by this extension'); $this->f=fopen($file, 'wb'); if(!$this->f) $this->Error('Unable to create output file: '.$file); $this->_putheader(); } function Image($file, $x=null, $y=null, $w=0, $h=0, $type='', $link='') { if(!isset($this->images[$file])) { //Retrieve only meta-information $a=getimagesize($file); if($a===false) $this->Error('Missing or incorrect image file: '.$file); $this->images[$file]=array('w'=>$a[0], 'h'=>$a[1], 'type'=>$a[2], 'i'=>count($this->images)+1); } parent::Image($file, $x, $y, $w, $h, $type, $link); } function Output($dest='', $name='', $isUTF8=false) { if($this->state<3) $this->Close(); } function _endpage() { parent::_endpage(); //Write page to file $filter=($this->compress) ? '/Filter /FlateDecode ' : ''; $p=($this->compress) ? gzcompress($this->buffer) : $this->buffer; $this->_newobj(); $this->_out('<<'.$filter.'/Length '.strlen($p).'>>'); $this->_putstream($p); $this->_out('endobj'); $this->buffer=''; } function _newobj($n=null) { $this->n++; $this->offsets[$this->n]=ftell($this->f); $this->_out($this->n.' 0 obj'); } function _out($s) { if($this->state==2) $this->buffer.=$s."\n"; else $this->_put($s); } function _put($s) { fwrite($this->f, $s."\n", strlen($s)+1); } function _putimages() { foreach(array_keys($this->images) as $file) { $type=$this->images[$file]['type']; if($type==1) $info=$this->_parsegif($file); elseif($type==2) $info=$this->_parsejpg($file); elseif($type==3) $info=$this->_parsepng($file); else $this->Error('Unsupported image type: '.$file); $this->_putimage($info); $this->images[$file]['n']=$info['n']; unset($info); } } function _putpages() { $nb=$this->page; if($this->DefOrientation=='P') { $wPt=$this->DefPageSize[0]*$this->k; $hPt=$this->DefPageSize[1]*$this->k; } else { $wPt=$this->DefPageSize[1]*$this->k; $hPt=$this->DefPageSize[0]*$this->k; } //Page objects for($n=1;$n<=$nb;$n++) { $this->_newobj(); $this->_out('<</Type /Page'); $this->_out('/Parent 1 0 R'); if(isset($this->PageSizes[$n])) $this->_out(sprintf('/MediaBox [0 0 %.2F %.2F]', $this->PageSizes[$n][0], $this->PageSizes[$n][1])); $this->_out('/Resources 2 0 R'); if(isset($this->PageLinks[$n])) { //Links $annots='/Annots ['; foreach($this->PageLinks[$n] as $pl) { $rect=sprintf('%.2F %.2F %.2F %.2F', $pl[0], $pl[1], $pl[0]+$pl[2], $pl[1]-$pl[3]); $annots.='<</Type /Annot /Subtype /Link /Rect ['.$rect.'] /Border [0 0 0] '; if(is_string($pl[4])) $annots.='/A <</S /URI /URI '.$this->_textstring($pl[4]).'>>>>'; else { $l=$this->links[$pl[4]]; $h=isset($this->PageSizes[$l[0]]) ? $this->PageSizes[$l[0]][1] : $hPt; $annots.=sprintf('/Dest [%d 0 R /XYZ 0 %.2F null]>>', 2+$nb+$l[0], $h-$l[1]*$this->k); } } $this->_out($annots.']'); } $this->_out('/Contents '.(2+$n).' 0 R>>'); $this->_out('endobj'); } //Pages root $this->offsets[1]=ftell($this->f); $this->_out('1 0 obj'); $this->_out('<</Type /Pages'); $kids='/Kids ['; for($n=1;$n<=$nb;$n++) $kids.=(2+$nb+$n).' 0 R '; $this->_out($kids.']'); $this->_out('/Count '.$nb); $this->_out(sprintf('/MediaBox [0 0 %.2F %.2F]', $wPt, $hPt)); $this->_out('>>'); $this->_out('endobj'); } function _putresources() { $this->_putfonts(); $this->_putimages(); //Resource dictionary $this->offsets[2]=ftell($this->f); $this->_out('2 0 obj'); $this->_out('<<'); $this->_putresourcedict(); $this->_out('>>'); $this->_out('endobj'); } function _putcatalog() { $this->_out('/Type /Catalog'); $this->_out('/Pages 1 0 R'); $n=3+$this->page; if($this->ZoomMode=='fullpage') $this->_out('/OpenAction ['.$n.' 0 R /Fit]'); elseif($this->ZoomMode=='fullwidth') $this->_out('/OpenAction ['.$n.' 0 R /FitH null]'); elseif($this->ZoomMode=='real') $this->_out('/OpenAction ['.$n.' 0 R /XYZ null null 1]'); elseif(!is_string($this->ZoomMode)) $this->_out('/OpenAction ['.$n.' 0 R /XYZ null null '.($this->ZoomMode/100).']'); if($this->LayoutMode=='single') $this->_out('/PageLayout /SinglePage'); elseif($this->LayoutMode=='continuous') $this->_out('/PageLayout /OneColumn'); elseif($this->LayoutMode=='two') $this->_out('/PageLayout /TwoColumnLeft'); } function _enddoc() { $this->_putpages(); $this->_putresources(); //Info $this->_newobj(); $this->_out('<<'); $this->_putinfo(); $this->_out('>>'); $this->_out('endobj'); //Catalog $this->_newobj(); $this->_out('<<'); $this->_putcatalog(); $this->_out('>>'); $this->_out('endobj'); //Cross-ref $o=ftell($this->f); $this->_out('xref'); $this->_out('0 '.($this->n+1)); $this->_out('0000000000 65535 f '); for($i=1;$i<=$this->n;$i++) $this->_out(sprintf('%010d 00000 n ', $this->offsets[$i])); //Trailer $this->_out('trailer'); $this->_out('<<'); $this->_puttrailer(); $this->_out('>>'); $this->_out('startxref'); $this->_out($o); $this->_out('%%EOF'); $this->state=3; fclose($this->f); } } ?>

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Quelle

http://www.fpdf.org/en/script/script76.php, zuletzt abgerufen 30.03.2016 03:34