PHP Extension Requires Chilkat v11.7.0+

Deflate Compression Level When Optimizing a PDF

See more PDF Optimization Examples

Demonstrates compressionLevel, which is the deflate level (1 to 9, 9 by default) used for every stream the optimizer re-encodes. Level 9 is the smallest and the slowest; level 1 is the quickest. The difference is usually a percent or two, so level 9 is the right default for a file that will be downloaded many times, and a lower level is worth considering only when a server optimizes PDFs on the fly. A value outside 1 to 9 is an error. 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 watersense_accomplishments.pdf

$fac = new CkFileAccess();
$json = new CkJsonObject();
$jsonOut = new CkJsonObject();

$pdf1 = new CkPdf();
$success = $pdf1->LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if ($success == false) {
    print $pdf1->lastErrorText() . "\n";
    exit;
}

$json->UpdateInt('compressionLevel',1);
$success = $pdf1->Optimize('optimize',$json,$jsonOut);
if ($success == false) {
    print $pdf1->lastErrorText() . "\n";
    exit;
}

$success = $pdf1->WriteFile('qa_output/watersense_level1.pdf');
if ($success == false) {
    print $pdf1->lastErrorText() . "\n";
    exit;
}

print 'level 1: ' . $fac->FileSize('qa_output/watersense_level1.pdf') . "\n";

$pdf9 = new CkPdf();
$success = $pdf9->LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if ($success == false) {
    print $pdf9->lastErrorText() . "\n";
    exit;
}

$json->UpdateInt('compressionLevel',9);
$success = $pdf9->Optimize('optimize',$json,$jsonOut);
if ($success == false) {
    print $pdf9->lastErrorText() . "\n";
    exit;
}

$success = $pdf9->WriteFile('qa_output/watersense_level9.pdf');
if ($success == false) {
    print $pdf9->lastErrorText() . "\n";
    exit;
}

print 'level 9: ' . $fac->FileSize('qa_output/watersense_level9.pdf') . "\n";

//  A level outside 1..9 fails, and LastErrorText says why.
$pdfBad = new CkPdf();
$success = $pdfBad->LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if ($success == false) {
    print $pdfBad->lastErrorText() . "\n";
    exit;
}

$json->UpdateInt('compressionLevel',12);
$success = $pdfBad->Optimize('optimize',$json,$jsonOut);
if ($success == false) {
    print 'compressionLevel 12 was refused, as it should be.' . "\n";
}


?>