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PHP 7 FPDF Example to Create Double Sided Pages Inside PDF Document in Browser Using Javascript
<?php
require('fpdf.php');
class DoubleSided_PDF extends FPDF
{
protected $doubleSided; // layout like books?
protected $outerMargin;
protected $innerMargin;
protected $xDelta; // if double-sided, difference between outer and inner
function __construct($orientation='P', $unit='mm', $format='A4')
{
parent::__construct($orientation,$unit,$format);
$this->doubleSided=false;
$this->xDelta=0;
$this->innerMargin=10;
$this->outerMargin=10;
}
function SetDoubleSided($inner=7, $outer=13)
{
if($outer != $inner) {
$this->doubleSided=true;
$this->outerMargin=$outer;
$this->innerMargin=$inner;
}
}
function Cell($w, $h=0, $txt='', $border=0, $ln=0, $align='', $fill=false, $link='')
{
//Output a cell
$k=$this->k;
if($this->y+$h>$this->PageBreakTrigger && !$this->InHeader && !$this->InFooter && $this->AcceptPageBreak())
{
//Automatic page break
$x=$this->x;
$ws=$this->ws;
if($ws>0)
{
$this->ws=0;
$this->_out('0 Tw');
}
$this->AddPage($this->CurOrientation,$this->CurPageSize);
$this->x=$x+$this->xDelta;
if($ws>0)
{
$this->ws=$ws;
$this->_out(sprintf('%.3F Tw',$ws*$k));
}
}
if($w==0)
$w=$this->w-$this->rMargin-$this->x;
$s='';
if($fill || $border==1)
{
if($fill)
$op=($border==1) ? 'B' : 'f';
else
$op='S';
$s=sprintf('%.2F %.2F %.2F %.2F re %s ',$this->x*$k,($this->h-$this->y)*$k,$w*$k,-$h*$k,$op);
}
if(is_string($border))
{
$x=$this->x;
$y=$this->y;
if(strpos($border,'L')!==false)
$s.=sprintf('%.2F %.2F m %.2F %.2F l S ',$x*$k,($this->h-$y)*$k,$x*$k,($this->h-($y+$h))*$k);
if(strpos($border,'T')!==false)
$s.=sprintf('%.2F %.2F m %.2F %.2F l S ',$x*$k,($this->h-$y)*$k,($x+$w)*$k,($this->h-$y)*$k);
if(strpos($border,'R')!==false)
$s.=sprintf('%.2F %.2F m %.2F %.2F l S ',($x+$w)*$k,($this->h-$y)*$k,($x+$w)*$k,($this->h-($y+$h))*$k);
if(strpos($border,'B')!==false)
$s.=sprintf('%.2F %.2F m %.2F %.2F l S ',$x*$k,($this->h-($y+$h))*$k,($x+$w)*$k,($this->h-($y+$h))*$k);
}
if($txt!=='')
{
if($align=='R')
$dx=$w-$this->cMargin-$this->GetStringWidth($txt);
elseif($align=='C')
$dx=($w-$this->GetStringWidth($txt))/2;
else
$dx=$this->cMargin;
if($this->ColorFlag)
$s.='q '.$this->TextColor.' ';
$txt2=str_replace(')','\\)',str_replace('(','\\(',str_replace('\\','\\\\',$txt)));
$s.=sprintf('BT %.2F %.2F Td (%s) Tj ET',($this->x+$dx)*$k,($this->h-($this->y+.5*$h+.3*$this->FontSize))*$k,$txt2);
if($this->underline)
$s.=' '.$this->_dounderline($this->x+$dx,$this->y+.5*$h+.3*$this->FontSize,$txt);
if($this->ColorFlag)
$s.=' Q';
if($link)
$this->Link($this->x+$dx,$this->y+.5*$h-.5*$this->FontSize,$this->GetStringWidth($txt),$this->FontSize,$link);
}
if($s)
$this->_out($s);
$this->lasth=$h;
if($ln>0)
{
//Go to next line
$this->y+=$h;
if($ln==1)
$this->x=$this->lMargin;
}
else
$this->x+=$w;
}
function _beginpage($orientation, $format, $rotation)
{
parent::_beginpage($orientation,$format,$rotation);
if ( $this->doubleSided ) {
if( $this->page % 2 == 0 ) {
$this->xDelta=$this->outerMargin - $this->innerMargin;
$this->SetLeftMargin($this->outerMargin);
$this->SetRightMargin($this->innerMargin);
} else {
$this->xDelta=$this->innerMargin - $this->outerMargin;
$this->SetLeftMargin($this->innerMargin);
$this->SetRightMargin($this->outerMargin);
}
$this->x=$this->lMargin;
$this->y=$this->tMargin;
}
}
}
?>
<?php
require('doublesided.php');
class PDF extends DoubleSided_PDF
{
function Header()
{
if ( $this->PageNo() % 2 == 0 ) {
$this->Cell(30,0,$this->PageNo(),0,0,'L');
$this->Cell(0,0,'This chapter has a title',0,0,'R');
}
else {
$this->Cell(160,0,'Topic of this chapter',0,0,'L');
$this->Cell(0,0,$this->PageNo(),0,2,'R');
}
//Line break
$this->SetY(20);
$this->SetLineWidth(0.01);
$this->Line($this->lMargin, 18, 210 - $this->rMargin, 18);
$this->Ln(15);
}
function Footer()
{
//Position at 1.5 cm from bottom
$this->SetLineWidth(0.01);
$this->Line($this->lMargin, 281.2, 210 - $this->rMargin, 281.2);
$this->SetY(-10);
//Page number
$this->Cell(0,3,'Page '.$this->PageNo().'/{nb}',0,0,'C');
}
}
$pdf = new PDF();
$pdf->AliasNbPages();
$pdf->SetDoubleSided(20,10);
$pdf->SetFont('Arial','',12);
$pdf->AddPage();
for ($i=0; $i < 60; $i++ )
$pdf->MultiCell(0, 10, str_repeat('a lot of text ',30)."...\n");
$pdf->SetDisplayMode('fullpage', 'single');
$pdf->Output();
?>
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