PHP Extension

Unzip a ZIP Entry Directly into a BinData Object Using ZipEntry.UnzipToBd

See more Zip Examples

This example demonstrates how to use the ZipEntry.UnzipToBd method to inflate a ZIP entry directly into a BinData object.

The entry contents are uncompressed entirely in memory without creating a file on disk.

This is useful when:

• Processing ZIP entry data entirely in memory
• Avoiding temporary filesystem files
• Working with binary files such as images, PDFs, or certificates
• Passing uncompressed ZIP data directly to other APIs

The example opens a ZIP archive, locates a PDF entry, inflates it into a BinData object, and then writes the uncompressed bytes to a new file.

Suppose the ZIP archive contains:

docs/report.pdf

The entry is uncompressed directly into memory before optionally being saved to:

qa_output/report.pdf

PHP Extension

<?php

include("chilkat.php");

$success = false;

$zip = new CkZip();

// Open an existing ZIP archive.
$success = $zip->OpenZip('qa_data/zips/documents.zip');
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

// Locate the PDF entry within the ZIP archive.
$entry = new CkZipEntry();

$success = $zip->EntryOf('docs/report.pdf',$entry);
if ($success == false) {
    print 'ZIP entry not found.' . "\n";
    $zip->CloseZip();
    exit;
}

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a BinData object.
// 
// The uncompressed bytes are stored entirely in memory.
// 
$pdfData = new CkBinData();

$success = $entry->UnzipToBd($pdfData);
if ($success == false) {
    print $entry->lastErrorText() . "\n";
    exit;
}

print 'Uncompressed size = ' . $pdfData->get_NumBytes() . "\n";
print '' . "\n";

// ------------------------------------------------------------
// Optionally save the uncompressed bytes to a file.
// 
$success = $pdfData->WriteFile('qa_output/report.pdf');
if ($success == false) {
    print $pdfData->lastErrorText() . "\n";
    exit;
}

$zip->CloseZip();

print 'PDF extracted successfully.' . "\n";

?>