PHP Extension Requires Chilkat v11.7.0+

Audit a PDF First, Optimize Only If It Is Worth It

See more PDF Optimization Examples

Demonstrates deciding whether to rewrite a PDF at all. "audit" costs a fraction of a second and changes nothing, so a batch job can audit every file and optimize only those where enough would be saved. Here the threshold is a tenth of the file; a file already as small as it can be is left alone. 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

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

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

$fileSize = $jsonOut->IntOf('fileSize');
$estimated = $jsonOut->IntOf('estimatedSavings.total');
print 'fileSize:  ' . $fileSize . "\n";
print 'estimated: ' . $estimated . "\n";

//  Only bother when at least a tenth of the file would go.
if ($estimated > ($fileSize / 10)) {
    print 'Worth optimizing.' . "\n";
    $success = $pdf->Optimize('optimize',$json,$jsonOut);
    if ($success == false) {
        print $pdf->lastErrorText() . "\n";
        exit;
    }

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

    print 'bytesSaved: ' . $jsonOut->IntOf('bytesSaved') . "\n";
}
else {
    print 'Already small enough; left as it is.' . "\n";
}


?>