PHP

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

Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\Zip;
use Chilkat2\ZipEntry;

$success = false;

$zip = new Zip();

// Open an existing ZIP archive.
try {
    $zip->OpenZip('qa_data/zips/documents.zip');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

$success = $zip->EntryOf('docs/report.pdf', $entry);
if (!$success) {
    echo "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 BinData();

try {
    $entry->UnzipToBd($pdfData);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Uncompressed size = ', $pdfData->NumBytes, "\n";
echo "\n";

// ------------------------------------------------------------
// Optionally save the uncompressed bytes to a file.
//
try {
    $pdfData->WriteFile('qa_output/report.pdf');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$zip->CloseZip();

echo "PDF extracted successfully.\n";