PHP Extension Requires Chilkat v11.7.0+

Tile a Watermark Across a PDF Page

See more PDF Watermark Examples

Demonstrates a tiled watermark, which repeats the stamp over the whole page instead of placing it once. Tiling overrides position.align; tile.spacingX and spacingY set the gaps, and tile.stagger offsets alternate rows by half a tile so the pattern does not line up in columns. A faint tiled stamp carrying the name or address is the usual way to mark a document so that a leaked copy can be traced back, and zOrder back keeps it behind the text where it does not hinder reading. PHP Extension

<?php

include("chilkat.php");

$success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example is available at long_report.pdf

$pdf = new CkPdf();
$success = $pdf->LoadFile('qa_data/pdf/long_report.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

$json = new CkJsonObject();
$json->UpdateString('type','text');

//  {date:FORMAT} is replaced per page when the watermark is added.  The other placeholders are
//  {page}, {pages} and {filename}; {{ gives a literal brace.
$json->UpdateString('text','jdoe@example.com  {date:yyyy-MM-dd}');
$json->UpdateString('id','trace');
$json->UpdateString('zOrder','back');
$json->UpdateNumber('font.size','14');
$json->UpdateNumber('opacity','0.15');
$json->UpdateNumber('rotation','30');

$json->UpdateBool('tile.enabled',true);
$json->UpdateNumber('tile.spacingX','60');
$json->UpdateNumber('tile.spacingY','80');
$json->UpdateBool('tile.stagger',true);

$jsonOut = new CkJsonObject();
$success = $pdf->Watermark('add',$json,$jsonOut);
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

print 'id: ' . $jsonOut->stringOf('id') . ' pages: ' . $jsonOut->stringOf('pages') . "\n";

$success = $pdf->WriteFile('qa_output/report_traced.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

//  Sample output:

//  id: trace pages: 1-3

?>